79 results match your criteria Acs Photonics[Journal]


Robust Extraction of Hyperbolic Metamaterial Permittivity using Total Internal Reflection Ellipsometry.

ACS Photonics 2018 ;5

Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.

Hyperbolic metamaterials are optical materials characterized by highly anisotropic effective permittivity tensor components having opposite signs along orthogonal directions. The techniques currently employed for characterizing the optical properties of hyperbolic metamaterials are limited in their capability for robust extraction of the complex permittivity tensor. Here we demonstrate how an ellipsometry technique based on total internal reflection can be leveraged to extract the permittivity of hyperbolic metamaterials with improved robustness and accuracy. Read More

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http://dx.doi.org/10.1021/acsphotonics.8b00086DOI Listing
January 2018

Sub-diffraction spatial mapping of nanomechanical modes using a plasmomechanical system.

ACS Photonics 2018 ;5

Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

Plasmomechanical systems - formed by introducing a mechanically compliant gap between metallic nanostructures - produce large optomechanical interactions that can be localized to deep subwavelength volumes. This unique ability opens a new path to study optomechanics in nanometer-scale regimes inaccessible by other methods. We show that the localized optomechanical interactions produced by plasmomechanics can be used to spatially map the displacement modes of a vibrating nanomechanical system with a resolution exceeding the diffraction limit. Read More

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http://dx.doi.org/10.1021/acsphotonics.8b00604DOI Listing
January 2018

Experimental Demonstration of Ultrafast THz Modulation in a Graphene-Based Thin Film Absorber through Negative Photoinduced Conductivity.

ACS Photonics 2019 Mar 14;6(3):720-727. Epub 2019 Feb 14.

Institute of Electronic Structure and Laser, FORTH, 70013 Heraklion, Crete, Greece.

We present an experimental demonstration and interpretation of an ultrafast optically tunable, graphene-based thin film absorption modulator for operation in the THz regime. The graphene-based component consists of a uniform CVD-grown graphene sheet stacked on an SU-8 dielectric substrate that is grounded by a metallic ground plate. The structure shows enhanced absorption originating from constructive interference of the impinging and reflected waves at the absorbing graphene sheet. Read More

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http://dx.doi.org/10.1021/acsphotonics.8b01595DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6429433PMC

Nanoimaging and Control of Molecular Vibrations through Electromagnetically Induced Scattering Reaching the Strong Coupling Regime.

ACS Photonics 2018 Sep 6;5(9):3594-3600. Epub 2018 Aug 6.

Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, Colorado 80309, United States.

Optical resonators can enhance light-matter interaction, modify intrinsic molecular properties such as radiative emission rates, and create new molecule-photon hybrid quantum states. To date, corresponding implementations are based on electronic transitions in the visible spectral region with large transition dipoles yet hampered by fast femtosecond electronic dephasing. In contrast, coupling molecular vibrations with their weaker dipoles to infrared optical resonators has been less explored, despite long-lived coherences with 2 orders of magnitude longer dephasing times. Read More

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http://dx.doi.org/10.1021/acsphotonics.8b00425DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6390704PMC
September 2018
1 Read

Quantifying the Limits of Detection of Surface-Enhanced Infrared Spectroscopy with Grating Order-Coupled Nanogap Antennas.

ACS Photonics 2018 Oct 10;5(10):4117-4124. Epub 2018 Sep 10.

Institute of Bioengineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland.

Infrared spectroscopy is widely used for biomolecular studies, but struggles when investigating minute quantities of analytes due to the mismatch between vibrational cross sections and IR wavelengths. It is therefore beneficial to enhance absorption signals by confining the infrared light to deeply subwavelength volumes comparable in size to the biomolecules of interest. This can be achieved with surface-enhanced infrared absorption spectroscopy, for which plasmonic nanorod antennas represent the predominant implementation. Read More

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http://dx.doi.org/10.1021/acsphotonics.8b00847DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6390698PMC
October 2018

High Internal Quantum Efficiency Ultraviolet Emission from Phase-Transition Cubic GaN Integrated on Nanopatterned Si(100).

ACS Photonics 2018 8;5(3):955-963. Epub 2018 Jan 8.

Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

Ultraviolet emission characteristics of cubic (c-) GaN enabled through hexagonal-to-cubic phase transition are reported. Substrate patterning and material growth are shown to affect phase purity and emission characteristics of c-GaN as studied by electron backscatter diffraction, and photo- and cathodoluminescence, respectively. Raman study shows a tensile strain in the c-GaN. Read More

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http://pubs.acs.org/doi/10.1021/acsphotonics.7b01231
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http://dx.doi.org/10.1021/acsphotonics.7b01231DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6376204PMC
January 2018
5 Reads

Plasmonic Dispersion Relations and Intensity Enhancement of Metal-Insulator-Metal Nanodisks.

ACS Photonics 2018 Dec 13;5(12):4823-4827. Epub 2018 Nov 13.

Institute of Physics, University of Graz, 8010 Graz, Austria.

We show that the plasmon modes of vertically stacked Ag-SiO-Ag nanodisks can be understood and classified as hybridized surface and edge modes. We describe their universal dispersion relations and demonstrate that coupling-induced spectral shifts are significantly stronger for surface modes than for edge modes. The experimental data correspond well to numerical simulations. Read More

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http://dx.doi.org/10.1021/acsphotonics.8b00938DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6302311PMC
December 2018

Finite-Size Effects in Metasurface Lasers Based on Resonant Dark States.

ACS Photonics 2018 Sep 24;5(9):3788-3793. Epub 2018 Aug 24.

Institute of Electronic Structure and Laser, FORTH, 71110 Heraklion, Crete, Greece.

The quest for subwavelength coherent light sources has recently led to the exploration of dark-mode based surface lasers, which allow for independent adjustment of the lasing state and its coherent radiation output. To understand how this unique design performs in real experiments, we need to consider systems of finite size and quantify finite-size effects not present in the infinite dark-mode surface laser model. Here we find that, depending on the size of the system, distinct and even counterintuitive behavior of the lasing state is possible, determined by a balanced competition between multiple loss channels, including dissipation, intentional out-coupling of coherent radiation, and leakage from the edges of the finite system. Read More

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http://dx.doi.org/10.1021/acsphotonics.8b00835DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6219820PMC
September 2018

One-Directional Antenna Systems: Energy Transfer from Monomers to J-Aggregates within 1D Nanoporous Aluminophosphates.

ACS Photonics 2018 Jan 19;5(1):151-157. Epub 2017 Oct 19.

Departamento de Química Física, Universidad del País Vasco, UPV/EHU, Apartado 644, 48080 Bilbao, Spain.

A cyanine dye (PIC) was occluded into two 1D-nanopoporus Mg-containing aluminophosphates with different pore size (MgAPO-5 and MgAPO-36 with AFI and ATS zeolitic structure types, with cylindrical channels of 7.3 Å diameter and elliptical channels of 6.7 Å × 7. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00553DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6197758PMC
January 2018

Adaptive Control of Necklace States in a Photonic Crystal Waveguide.

ACS Photonics 2018 Oct 14;5(10):3984-3988. Epub 2018 Sep 14.

Complex Photonic Systems (COPS), MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

Resonant cavities with high quality factor and small mode volume provide crucial enhancement of light-matter interactions in nanophotonic devices that transport and process classical and quantum information. The production of functional circuits containing many such cavities remains a major challenge, as inevitable imperfections in the fabrication detune the cavities, which strongly affects functionality such as transmission. In photonic crystal waveguides, intrinsic disorder gives rise to high- localized resonances through Anderson localization; however their location and resonance frequencies are completely random, which hampers functionality. Read More

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http://pubs.acs.org/doi/10.1021/acsphotonics.8b01038
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http://dx.doi.org/10.1021/acsphotonics.8b01038DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6195811PMC
October 2018
15 Reads

Power Balance and Temperature in Optically Pumped Spasers and Nanolasers.

ACS Photonics 2018 Sep 24;5(9):3695-3703. Epub 2018 Aug 24.

Institute of Applied Physics, Johannes Kepler University, Altenberger Straße 69, 4040, Linz, Austria.

Spasers and nanolasers produce a significant amount of heat, which impedes their realizability. We numerically investigate the farfield emission and thermal load in optically pumped spasers with a coupled electromagnetic/thermal model, including additional temperature discontinuities due to interfacial Kapitza resistance. This approach allows to explore multiple combinations of constitutive materials suitable for robust manufacturable spasers. Read More

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http://pubs.acs.org/doi/10.1021/acsphotonics.8b00705
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http://dx.doi.org/10.1021/acsphotonics.8b00705DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6156092PMC
September 2018
12 Reads

DNA Origami Route for Nanophotonics.

ACS Photonics 2018 Apr 12;5(4):1151-1163. Epub 2018 Feb 12.

Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, D-70569 Stuttgart, Germany.

The specificity and simplicity of the Watson-Crick base pair interactions make DNA one of the most versatile construction materials for creating nanoscale structures and devices. Among several DNA-based approaches, the DNA origami technique excels in programmable self-assembly of complex, arbitrary shaped structures with dimensions of hundreds of nanometers. Importantly, DNA origami can be used as templates for assembly of functional nanoscale components into three-dimensional structures with high precision and controlled stoichiometry. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b01580DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6156112PMC
April 2018
5 Reads

Nonlinear Photoacoustic Imaging by Multiphoton Upconversion and Energy Transfer.

ACS Photonics 2017 Nov 11;4(11):2699-2705. Epub 2017 Oct 11.

Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, New York 14260, USA.

In recent years, photoacoustic tomography (PAT) is increasingly used in biomedical research, as it allows for direct visualization of optical absorption in deep tissue. In addition to vascular and hemodynamic imaging using endogenous contrasts, PAT is also capable of imaging neural and molecular dynamics with extrinsic contrasts. While near-infrared (NIR)-absorbing contrasts are preferred for deep tissue imaging, compared to visible-light-absorbing contrasts, they are much harder to design and synthesize with good environmental stability. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00399DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6150608PMC
November 2017
2 Reads

Exciton Fine Structure and Lattice Dynamics in InP/ZnSe Core/Shell Quantum Dots.

ACS Photonics 2018 Aug 17;5(8):3353-3362. Epub 2018 Jul 17.

Debye Institute for Nanomaterials Science, Utrecht University, 3584 CC Utrecht, The Netherlands.

Nanocrystalline InP quantum dots (QDs) hold promise for heavy-metal-free optoelectronic applications due to their bright and size-tunable emission in the visible range. Photochemical stability and high photoluminescence (PL) quantum yield are obtained by a diversity of epitaxial shells around the InP core. To understand and optimize the emission line shapes, the exciton fine structure of InP core/shell QD systems needs be investigated. Read More

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http://dx.doi.org/10.1021/acsphotonics.8b00615DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6115013PMC
August 2018
4 Reads

Plasmon-Enhanced Single-Molecule Enzymology.

ACS Photonics 2018 Aug 23;5(8):3073-3081. Epub 2018 May 23.

Molecular Biosensing for Medical Diagnostics, Faculty of Applied Physics, and Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB, Eindhoven, The Netherlands.

We present a numerical study on plasmon-enhanced single-molecule enzymology. We combine Brownian dynamics and electromagnetic simulations to calculate the enhancement of fluorescence signals of fluorogenic substrate converted by an enzyme conjugated to a plasmonic particle. We simulate the Brownian motion of a fluorescent product away from the active site of the enzyme, and calculate the photon detection rate taking into account modifications of the excitation and emission processes by coupling to the plasmon. Read More

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http://dx.doi.org/10.1021/acsphotonics.8b00327DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6105035PMC
August 2018
4 Reads

Plasmonic Enhancement of Two-Photon-Excited Luminescence of Single Quantum Dots by Individual Gold Nanorods.

ACS Photonics 2018 Jul 11;5(7):2960-2968. Epub 2018 Jun 11.

Huygens-Kamerlingh Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands.

Plasmonic enhancement of two-photon-excited fluorescence is not only of fundamental interest but also appealing for many bioimaging and photonic applications. The high peak intensity required for two-photon excitation may cause shape changes in plasmonic nanostructures, as well as transient plasmon broadening. Yet, in this work, we report on strong enhancement of the two-photon-excited photoluminescence of single colloidal quantum dots close to isolated chemically synthesized gold nanorods. Read More

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http://dx.doi.org/10.1021/acsphotonics.8b00306DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6057742PMC
July 2018
1 Read

Rapid Voltage Sensing with Single Nanorods via the Quantum Confined Stark Effect.

ACS Photonics 2018 Jul 24;5(7):2860-2867. Epub 2018 Jun 24.

Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.

Properly designed colloidal semiconductor quantum dots (QDs) have already been shown to exhibit high sensitivity to external electric fields via the quantum confined Stark effect (QCSE). Yet, detection of the characteristic spectral shifts associated with the effect of the QCSE has traditionally been painstakingly slow, dramatically limiting the sensitivity of these QD sensors to fast transients. We experimentally demonstrate a new detection scheme designed to achieve shot-noise-limited sensitivity to emission wavelength shifts in QDs, showing feasibility for their use as local electric field sensors on the millisecond time scale. Read More

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http://pubs.acs.org/doi/10.1021/acsphotonics.8b00206
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http://dx.doi.org/10.1021/acsphotonics.8b00206DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6053642PMC
July 2018
2 Reads

High Internal Emission Efficiency of Silicon Nanoparticles Emitting in the Visible Range.

ACS Photonics 2018 Jun 10;5(6):2129-2136. Epub 2018 Apr 10.

Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.

Light-emitting silicon nanoparticles (Si-NPs) are interesting for lighting applications due to their nontoxicity, chemical robustness, and photostability; however, they are not practically considered due to their low emission efficiencies. While large Si-NPs emitting in the red to infrared spectral region show ensemble emission quantum efficiencies up to 60%, the emission efficiencies of smaller Si-NPs, emitting in the visible spectral range, are far lower, typically below 10-20%. In this work, we test this efficiency limit by measuring for the first time the internal quantum efficiency (IQE), i. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b01624DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6019024PMC
June 2018
2 Reads

Trion-Polariton Formation in Single-Walled Carbon Nanotube Microcavities.

ACS Photonics 2018 Jun 8;5(6):2074-2080. Epub 2018 May 8.

Institute for Physical Chemistry, Universität Heidelberg, D-69120 Heidelberg, Germany.

We demonstrate the formation and tuning of charged trion-polaritons in polymer-sorted (6,5) single-walled carbon nanotubes in a planar metal-clad microcavity at room temperature. The positively charged trion-polaritons were induced by electrochemical doping and characterized by angle-resolved reflectance and photoluminescence spectroscopy. The doping level of the nanotubes within the microcavity was controlled by the applied bias and thus enabled tuning from mainly excitonic to a mixture of exciton and trion transitions. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b01549DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6019025PMC

Analyses of Intravesicular Exosomal Proteins Using a Nano-Plasmonic System.

ACS Photonics 2018 Feb 3;5(2):487-494. Epub 2017 Nov 3.

Center for Systems Biology, Massachusetts General Hospital, 185 Cambridge St, CPZN 5206, Boston, MA 02114.

Extracellular vesicles (EVs), including exosomes, are nanoscale membrane particles shed from cells and contain cellular proteins whose makeup could inform cancer diagnosis and treatment. Most analyses have focused on surface proteins while analysis of intravesicular proteins has been more challenging. Herein, we report an EV screening assay for both intravesicular and transmembrane proteins using a nanoplasmonic sensor. Read More

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http://pubs.acs.org/doi/10.1021/acsphotonics.7b00992
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http://dx.doi.org/10.1021/acsphotonics.7b00992DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5966285PMC
February 2018
1 Read

Terahertz Magnon-Polaritons in TmFeO.

ACS Photonics 2018 Apr 1;5(4):1375-1380. Epub 2018 Feb 1.

Radboud University, Institute for Molecules and Materials, Nijmegen, The Netherlands.

Magnon-polaritons are shown to play a dominant role in the propagation of terahertz (THz) waves through TmFeO orthoferrite, if the frequencies of the waves are in the vicinity of the quasi-antiferromagnetic spin resonance mode. Both time-domain THz transmission and emission spectroscopies reveal clear beatings between two modes with frequencies slightly above and slightly below this resonance, respectively. Rigorous modeling of the interaction between the spins of TmFeO and the THz light shows that the frequencies correspond to the upper and lower magnon-polariton branches. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b01402DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5953567PMC
April 2018
3 Reads

How Dark Are Radial Breathing Modes in Plasmonic Nanodisks?

ACS Photonics 2018 Mar 12;5(3):861-866. Epub 2017 Dec 12.

Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Sud, 91405 Orsay, France.

Due to a vanishing dipole moment, radial breathing modes in small flat plasmonic nanoparticles do not couple to light and have to be probed with a near-field source, as in electron energy loss spectroscopy (EELS). With increasing particle size, retardation gives rise to light coupling, enabling probing breathing modes optically or by cathodoluminescence (CL). Here, we investigate single silver nanodisks with diameters of 150-500 nm by EELS and CL in an electron microscope and quantify the EELS/CL ratio, which corresponds to the ratio of full to radiative damping of the breathing mode. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b01060DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5871341PMC
March 2018
1 Read

Antimatched Electromagnetic Metasurfaces for Broadband Arbitrary Phase Manipulation in Reflection.

ACS Photonics 2018 Mar 3;5(3):1101-1107. Epub 2018 Jan 3.

Institute of Electronic Structure and Laser, FORTH, GR-71110 Heraklion, Crete, Greece.

Metasurfaces impart phase discontinuities on impinging electromagnetic waves that are typically limited to 0-2π. Here, we demonstrate that multiresonant metasurfaces can break free from this limitation and supply arbitrarily large, tunable time delays over ultrawide bandwidths. As such, ultrathin metasurfaces can act as the equivalent of thick bulk structures by emulating the multiple geometric resonances of three-dimensional systems that originate from phase accumulation with effective material resonances implemented on the surface itself via suitable subwavelength meta-atoms. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b01415DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5865077PMC
March 2018
2 Reads

Ab Initio Optimized Effective Potentials for Real Molecules in Optical Cavities: Photon Contributions to the Molecular Ground State.

ACS Photonics 2018 Mar 9;5(3):992-1005. Epub 2018 Jan 9.

Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany.

We introduce a simple scheme to efficiently compute photon exchange-correlation contributions due to the coupling to transversal photons as formulated in the newly developed quantum-electrodynamical density-functional theory (QEDFT).1-5 Our construction employs the optimized-effective potential (OEP) approach by means of the Sternheimer equation to avoid the explicit calculation of unoccupied states. We demonstrate the efficiency of the scheme by applying it to an exactly solvable GaAs quantum ring model system, a single azulene molecule, and chains of sodium dimers, all located in optical cavities and described in full real space. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b01279DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5865078PMC

Near-Infrared and Optical Beam Steering and Frequency Splitting in Air-Holes-in-Silicon Inverse Photonic Crystals.

ACS Photonics 2017 Nov 28;4(11):2782-2788. Epub 2017 Sep 28.

Institute of Electronic Structure and Laser, FORTH, 71110, Heraklion, Crete, Greece.

We present the design of a dielectric inverse photonic crystal structure that couples line-defect waveguide propagating modes into highly directional beams of controllable directionality. The structure utilizes a triangular lattice made of air holes drilled in an infinitely thick Si slab, and it is designed for operation in the near-infrared and optical regime. The structure operation is based on the excitation and manipulation of dark dielectric surface states, in particular on the tailoring of the dark states' coupling to outgoing radiation. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00739DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5840860PMC
November 2017
1 Read

Hot Carrier Generation and Extraction of Plasmonic Alloy Nanoparticles.

ACS Photonics 2017 May 6;4(5):1146-1152. Epub 2017 Mar 6.

Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Delft 2628-BL, The Netherlands.

The conversion of light to electrical and chemical energy has the potential to provide meaningful advances to many aspects of daily life, including the production of energy, water purification, and optical sensing. Recently, plasmonic nanoparticles (PNPs) have been increasingly used in artificial photosynthesis (e.g. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b01048DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5770161PMC
May 2017
2 Reads

Single-Photon Nanoantennas.

ACS Photonics 2017 Apr 10;4(4):710-722. Epub 2017 Mar 10.

Center for Nanophotonics, AMOLF, Science Park 104, NL-1098XG, Amsterdam, The Netherlands.

Single-photon nanoantennas are broadband strongly scattering nanostructures placed in the near field of a single quantum emitter, with the goal to enhance the coupling between the emitter and far-field radiation channels. Recently, great strides have been made in the use of nanoantennas to realize fluorescence brightness enhancements, and Purcell enhancements, of several orders of magnitude. This perspective reviews the key figures of merit by which single-photon nanoantenna performance is quantified and the recent advances in measuring these metrics unambiguously. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00061DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5770162PMC
April 2017
1 Read

Single-Photon Quantum Contextuality on a Chip.

ACS Photonics 2017 Nov 17;4(11):2807-2812. Epub 2017 Oct 17.

Dipartimento di Fisica, Politecnico di Milano, p.za Leonardo da Vinci 32, 20133 Milano, Italy.

In classical physics, properties of objects exist independently of the context, i.e., whether and how measurements are performed. Read More

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http://pubs.acs.org/doi/10.1021/acsphotonics.7b00793
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http://dx.doi.org/10.1021/acsphotonics.7b00793DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5726848PMC
November 2017
4 Reads

Integrating Quantum Dots and Dielectric Mie Resonators: A Hierarchical Metamaterial Inheriting the Best of Both.

ACS Photonics 2017 Sep 3;4(9):2187-2196. Epub 2017 Aug 3.

University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands.

Nanoscale dielectric resonators and quantum-confined semiconductors have enabled unprecedented control over light absorption and excited charges, respectively. In this work, we embed luminescent silicon nanocrystals (Si-NCs) into a 2D array of SiO nanocylinders and experimentally prove a powerful concept: the resulting metamaterial preserves the radiative properties of the Si-NCs and inherits the spectrally selective absorption properties of the nanocylinders. This hierarchical approach provides increased photoluminescence (PL) intensity obtained without utilizing any lossy plasmonic components. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00320DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5646587PMC
September 2017
1 Read

Visual Understanding of Light Absorption and Waveguiding in Standing Nanowires with 3D Fluorescence Confocal Microscopy.

ACS Photonics 2017 Sep 21;4(9):2235-2241. Epub 2017 Aug 21.

Laboratory of Semiconductor Materials, Institute of Materials, School of Engineering, EPFL, 1015 Lausanne, Switzerland.

Semiconductor nanowires are promising building blocks for next-generation photonics. Indirect proofs of large absorption cross sections have been reported in nanostructures with subwavelength diameters, an effect that is even more prominent in vertically standing nanowires. In this work we provide a three-dimensional map of the light around vertical GaAs nanowires standing on a substrate by using fluorescence confocal microscopy, where the strong long-range disruption of the light path along the nanowire is illustrated. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00434DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5617333PMC
September 2017
10 Reads

Observing Plasmon Damping Due to Adhesion Layers in Gold Nanostructures Using Electron Energy Loss Spectroscopy.

ACS Photonics 2017 Feb 13;4(2):268-274. Epub 2017 Jan 13.

Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305-4034 USA.

Gold plasmonic nanostructures with several different adhesion layers have been studied with monochromated electron energy loss spectroscopy in the scanning transmission electron microscope (STEM-EELS) and with surface enhanced Raman spectroscopy (SERS). Compared to samples with no adhesion layer, those with 2nm of Cr or Ti show broadened, lower intensity plasmon peaks as measured with EELS. This broadening is observed in both optically active ("bright") and inactive ("dark") plasmon modes. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00525DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5604478PMC
February 2017
4 Reads

Near-Field Optical Drilling of Sub-λ Pits in Thin Polymer Films.

ACS Photonics 2017 Jun 25;4(6):1292-1297. Epub 2017 May 25.

Nanophotonics Centre, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, United Kingdom.

Under UV illumination, polymer films can undergo chain scission and contract. Using this effect, tightly focused laser light is shown to develop runaway near-field concentration that drills sub-100 nm pits through a thin film. This subwavelength photolithography can be controlled in real time by monitoring laser scatter from the evolving holes, allowing systematic control of the void diameter. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b01000DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5578361PMC
June 2017
10 Reads

Core-Shell Plasmonic Nanohelices.

ACS Photonics 2017 Jul 13;4(7):1858-1863. Epub 2017 Jun 13.

Kavli Institute of Nanoscience, Department for Quantum Nanoscience, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

We introduce core-shell plasmonic nanohelices, highly tunable structures that have a different response in the visible for circularly polarized light of opposite handedness. The glass core of the helices is fabricated using electron beam induced deposition and the pure gold shell is subsequently sputter coated. Optical measurements allow us to explore the chiral nature of the nanohelices, where differences in the response to circularly polarized light of opposite handedness result in a dissymmetry factor of 0. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00496DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5557610PMC
July 2017
2 Reads

High Photocurrent in Gated Graphene-Silicon Hybrid Photodiodes.

ACS Photonics 2017 Jun 30;4(6):1506-1514. Epub 2017 May 30.

University of Siegen, School of Science and Technology, Department of Electrical Engineering and Computer Science, Hölderlinstr. 3, 57076 Siegen, Germany.

Graphene/silicon (G/Si) heterojunction based devices have been demonstrated as high responsivity photodetectors that are potentially compatible with semiconductor technology. Such G/Si Schottky junction diodes are typically in parallel with gated G/silicon dioxide (SiO)/Si areas, where the graphene is contacted. Here, we utilize scanning photocurrent measurements to investigate the spatial distribution and explain the physical origin of photocurrent generation in these devices. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00285DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5526651PMC
June 2017
3 Reads

Impact of Phonons on Dephasing of Individual Excitons in Deterministic Quantum Dot Microlenses.

ACS Photonics 2016 Dec 8;3(12):2461-2466. Epub 2016 Nov 8.

Univ. Grenoble Alpes, F-38000 Grenoble, France.

Optimized light-matter coupling in semiconductor nanostructures is a key to understand their optical properties and can be enabled by advanced fabrication techniques. Using in situ electron beam lithography combined with a low-temperature cathodoluminescence imaging, we deterministically fabricate microlenses above selected InAs quantum dots (QDs), achieving their efficient coupling to the external light field. This enables performing four-wave mixing microspectroscopy of single QD excitons, revealing the exciton population and coherence dynamics. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00707DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5503178PMC
December 2016
15 Reads

Light-Directed Tuning of Plasmon Resonances via Plasmon-Induced Polymerization Using Hot Electrons.

ACS Photonics 2017 Jun 25;4(6):1453-1458. Epub 2017 Apr 25.

Nanophotonics Centre, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.

The precise morphology of nanoscale gaps between noble-metal nanostructures controls their resonant wavelengths. Here we show photocatalytic plasmon-induced polymerization can locally enlarge the gap size and tune the plasmon resonances. We demonstrate light-directed programmable tuning of plasmons can be self-limiting. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00206DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5485798PMC
June 2017
25 Reads

Single Quantum Dot with Microlens and 3D-Printed Micro-objective as Integrated Bright Single-Photon Source.

ACS Photonics 2017 Jun 31;4(6):1327-1332. Epub 2017 May 31.

Institute of Solid State Physics, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany.

Integrated single-photon sources with high photon-extraction efficiency are key building blocks for applications in the field of quantum communications. We report on a bright single-photon source realized by on-chip integration of a deterministic quantum dot microlens with a 3D-printed multilens micro-objective. The device concept benefits from a sophisticated combination of in situ 3D electron-beam lithography to realize the quantum dot microlens and 3D femtosecond direct laser writing for creation of the micro-objective. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00253DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5485799PMC
June 2017
10 Reads

Watt-Level Continuous-Wave Emission from a Bifunctional Quantum Cascade Laser/Detector.

ACS Photonics 2017 May 18;4(5):1225-1231. Epub 2017 Apr 18.

Department of Physics and John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.

Bifunctional active regions, capable of light generation and detection at the same wavelength, allow a straightforward realization of the integrated mid-infrared photonics for sensing applications. Here, we present a high performance bifunctional device for 8 μm capable of 1 W single facet continuous wave emission at 15 °C. Apart from the general performance benefits, this enables sensing techniques which rely on continuous wave operation, for example, heterodyne detection, to be realized within a monolithic platform and demonstrates that bifunctional operation can be realized at longer wavelength, where wavelength matching becomes increasingly difficult and that the price to be paid in terms of performance is negligible. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00133DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5437807PMC
May 2017
30 Reads

Electrically-Pumped Wavelength-Tunable GaAs Quantum Dots Interfaced with Rubidium Atoms.

ACS Photonics 2017 Mar;4(4):868-872

Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstraße 20, Dresden, 01069 Germany.

We demonstrate the first wavelength-tunable electrically pumped source of nonclassical light that can emit photons with wavelength in resonance with the D transitions of Rb atoms. The device is fabricated by integrating a novel GaAs single-quantum-dot light-emitting diode (LED) onto a piezoelectric actuator. By feeding the emitted photons into a 75 mm long cell containing warm Rb vapor, we observe slow-light with a temporal delay of up to 3. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00935DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5433560PMC
March 2017
9 Reads

High-Power Growth-Robust InGaAs/InAlAs Terahertz Quantum Cascade Lasers.

ACS Photonics 2017 Apr 27;4(4):957-962. Epub 2017 Feb 27.

Photonics Institute, TU Wien, Gußhausstraße 27-29, 1040 Vienna, Austria.

We report on high-power terahertz quantum cascade lasers based on low effective electron mass InGaAs/InAlAs semiconductor heterostructures with excellent reproducibility. Growth-related asymmetries in the form of interface roughness and dopant migration play a crucial role in this material system. These bias polarity dependent phenomena are studied using a nominally symmetric active region resulting in a preferential electron transport in the growth direction. Read More

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http://dx.doi.org/10.1021/acsphotonics.7b00009DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5407654PMC
April 2017
8 Reads

The Origin and Limit of Asymmetric Transmission in Chiral Resonators.

ACS Photonics 2017 Apr 29;4(4):884-890. Epub 2017 Mar 29.

Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.

We observe that the asymmetric transmission (AT) through photonic systems with a resonant chiral response is strongly related to the far-field properties of eigenmodes of the system. This understanding can be used to predict the AT for any resonant system from its complex eigenmodes. We find that the resonant chiral phenomenon of AT is related to, and is bounded by, the nonresonant scattering properties of the system. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00947DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5407655PMC
April 2017
2 Reads

Optical resonance imaging: An optical analog to MRI with sub-diffraction-limited capabilities.

ACS Photonics 2016 Dec 8;3(12):2445-2452. Epub 2016 Nov 8.

Department of Chemistry, The Institute for Biophysical Dynamics, The James Franck Institute, The University of Chicago, Chicago, IL, 60637, USA.

We propose here optical resonance imaging (ORI), a direct optical analog to magnetic resonance imaging (MRI). The proposed pulse sequence for ORI maps space to time and recovers an image from a heterodyne-detected third-order nonlinear photon echo measurement. As opposed to traditional photon echo measurements, the third pulse in the ORI pulse sequence has significant pulse-front tilt that acts as a temporal gradient. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00694DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5403159PMC
December 2016
6 Reads

Enhanced Telecom Emission from Single Group-IV Quantum Dots by Precise CMOS-Compatible Positioning in Photonic Crystal Cavities.

ACS Photonics 2017 Mar 13;4(3):665-673. Epub 2017 Feb 13.

Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz , Altenbergerstraße 69, 4040 Linz, Austria.

Efficient coupling to integrated high-quality-factor cavities is crucial for the employment of germanium quantum dot (QD) emitters in future monolithic silicon-based optoelectronic platforms. We report on strongly enhanced emission from single Ge QDs into L3 photonic crystal resonator (PCR) modes based on precise positioning of these dots at the maximum of the respective mode field energy density. Perfect site control of Ge QDs grown on prepatterned silicon-on-insulator substrates was exploited to fabricate in one processing run almost 300 PCRs containing single QDs in systematically varying positions within the cavities. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b01045DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5355891PMC
March 2017
7 Reads

Label-Free Single-Molecule Imaging with Numerical-Aperture-Shaped Interferometric Scattering Microscopy.

ACS Photonics 2017 Feb 18;4(2):211-216. Epub 2017 Jan 18.

Physical and Theoretical Chemistry Laboratory, University of Oxford , South Parks Road, OX1 3QZ Oxford, U.K.

Our ability to optically interrogate nanoscopic objects is controlled by the difference between their extinction cross sections and the diffraction-limited area to which light can be confined in the far field. We show that a partially transmissive spatial mask placed near the back focal plane of a high numerical aperture microscope objective enhances the extinction contrast of a scatterer near an interface by approximately , where is the transmissivity of the mask. Numerical-aperture-based differentiation of background from scattered light represents a general approach to increasing extinction contrast and enables routine label-free imaging down to the single-molecule level. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00912DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5323080PMC
February 2017
5 Reads

Analytic Optimization of Near-Field Optical Chirality Enhancement.

ACS Photonics 2017 Feb 25;4(2):396-406. Epub 2017 Jan 25.

Institut für Physikalische und Theoretische Chemie, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany.

We present an analytic derivation for the enhancement of local optical chirality in the near field of plasmonic nanostructures by tuning the far-field polarization of external light. We illustrate the results by means of simulations with an achiral and a chiral nanostructure assembly and demonstrate that local optical chirality is significantly enhanced with respect to circular polarization in free space. The optimal external far-field polarizations are different from both circular and linear. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00887DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5319396PMC
February 2017
5 Reads

Optimization of Nanoparticle-Based SERS Substrates through Large-Scale Realistic Simulations.

ACS Photonics 2017 Feb 20;4(2):329-337. Epub 2016 Dec 20.

ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain; ICREA-Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys 23, 08010 Barcelona, Spain.

Surface-enhanced Raman scattering (SERS) has become a widely used spectroscopic technique for chemical identification, providing unbeaten sensitivity down to the single-molecule level. The amplification of the optical near field produced by collective electron excitations -plasmons- in nanostructured metal surfaces gives rise to a dramatic increase by many orders of magnitude in the Raman scattering intensities from neighboring molecules. This effect strongly depends on the detailed geometry and composition of the plasmon-supporting metallic structures. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00786DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5319398PMC
February 2017
6 Reads

Electromagnetic Confinement via Spin-Orbit Interaction in Anisotropic Dielectrics.

ACS Photonics 2016 Dec 11;3(12):2249-2254. Epub 2016 Nov 11.

Optics Laboratory, Tampere University of Technology, FI-33101 Tampere, Finland; NooEL - Nonlinear Optics and OptoElectronics Lab, University "Roma Tre", IT-00146 Rome, Italy; CNR-ISC, Institute for Complex Systems, IT-00185 Rome, Italy.

We investigate electromagnetic propagation in uniaxial dielectrics with a transversely varying orientation of the optic axis, the latter staying orthogonal everywhere in the propagation direction. In such a geometry, the field experiences no refractive index gradients, yet it acquires a transversely modulated Pancharatnam-Berry phase, that is, a geometric phase originating from a spin-orbit interaction. We show that the periodic evolution of the geometric phase versus propagation gives rise to a longitudinally invariant effective potential. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00700DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5312827PMC
December 2016
4 Reads

Surface Lattice Resonances for Enhanced and Directional Electroluminescence at High Current Densities.

ACS Photonics 2016 Dec 9;3(12):2225-2230. Epub 2016 Nov 9.

Institute for Physical Chemistry, Universität Heidelberg , D-69120 Heidelberg, Germany.

Hybrid photonic-plasmonic modes in periodic arrays of metallic nanostructures offer a promising trade-off between high-quality cavities and subdiffraction mode confinement. However, their application in electrically driven light-emitting devices is hindered by their sensitivity to the surrounding environment and to charge injecting metallic electrodes in particular. Here, we demonstrate that the planar structure of light-emitting field-effect transistor (LEFET) ensures undisturbed operation of the characteristic modes. Read More

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http://pubs.acs.org/doi/10.1021/acsphotonics.6b00491
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http://dx.doi.org/10.1021/acsphotonics.6b00491DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5191620PMC
December 2016
4 Reads

Spatio-temporal Modeling of Lasing Action in Core-Shell Metallic Nanoparticles.

ACS Photonics 2016 Oct 6;3(10):1952-1960. Epub 2016 Sep 6.

Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid , E-28049 Madrid, Spain.

Nanoscale laser sources based on single metallic nanoparticles (spasers) have attracted significant interest for their fundamental implications and technological potential. Here we theoretically investigate the spatio-temporal dynamics of lasing action in core-shell metallic nanoparticles that include optically pumped four-level gain media. By using detailed semiclassical simulations based on a time-domain generalization of the finite-element method, we study the evolution of the lasing dynamics when going from a spherical case to an elongated nanorod configuration. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00501DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5073962PMC
October 2016

Gyroid Optical Metamaterials: Calculating the Effective Permittivity of Multidomain Samples.

ACS Photonics 2016 Oct 6;3(10):1888-1896. Epub 2016 Sep 6.

Adolphe Merkle Institute , Chemin des Verdiers 4, 1700 Fribourg, Switzerland.

Gold gyroid optical metamaterials are known to possess a reduced plasma frequency and linear dichroism imparted by their intricate subwavelength single gyroid morphology. The anisotropic optical properties are, however, only evident when a large individual gyroid domain is investigated. Multidomain gyroid metamaterials, fabricated using a polyisoprene--polystyrene--poly(ethylene oxide) triblock terpolymer and consisting of multiple small gyroid domains with random orientation and handedness, instead exhibit isotropic optical properties. Read More

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http://dx.doi.org/10.1021/acsphotonics.6b00400DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5073949PMC
October 2016
13 Reads
1 Citation