40 results match your criteria Plasmonics [Journal]

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Effective Optical Properties of Inhomogeneously Distributed Nanoobjects in Strong Field Gradients of Nanoplasmonic Sensors.

Plasmonics 2018 28;13(6):2423-2434. Epub 2018 May 28.

1Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.

Accurate and efficient modeling of discontinuous, randomly distributed entities is a computationally challenging task, especially in the presence of large and inhomogeneous electric near-fields of plasmons. Simultaneously, the anisotropy of sensed entities and their overlap with inhomogeneous fields means that typical effective medium approaches may fail at describing their optical properties. Here, we extend the Maxwell Garnett mixing formula to overcome this limitation by introducing a gradient within the effective medium description of inhomogeneous nanoparticle layers. Read More

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http://dx.doi.org/10.1007/s11468-018-0769-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6280852PMC
May 2018
1 Read

Characteristics of Fluorescence Emission Excited by Grating-Coupled Surface Plasmons.

Plasmonics 2018 16;13(6):2337-2343. Epub 2018 May 16.

2AIT Austrian Institute of Technology, Konrad-Lorenz-Straße 24, 3430 Tulln an der Donau, Austria.

Dye molecules placed on metallic gratings can experience an enhanced electromagnetic field if illuminated under surface plasmon excitation conditions, a situation that can be employed for sensor applications. The fluorescence emission in this situation exhibits a characteristic emission polarization and geometry given by the fluorophore/grating interaction. We present experiments visualizing the full shape of the emission profiles and demonstrate how they can be manipulated by means of the grating constant. Read More

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http://dx.doi.org/10.1007/s11468-018-0757-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6280977PMC
May 2018
4 Reads

Well Controlling of Plasmonic Features of Gold Nanoparticles on Macro Porous Silicon Substrate by HF Acid Concentration.

Plasmonics 2018 12;13(6):2037-2045. Epub 2018 Mar 12.

2Ministry of Science and Technology, Baghdad, Iraq.

In this work, we fabricated an efficient macroporous silicon/gold nanoparticles (macro psi/AuNPs) hybrid structure and how well controlling of plasmonic features on macro psi/AuNPs employs them for highly sensitive detection of the very low concentration of cyanine (Cy) dyes molecules. Macro-PSi was synthesized on n-type Si wafer with 3-10 Ω. cm resistivity and 100 orientation using Photo Electro Chemical Etching (PECE) process with630 nm illumination wavelength and 30 mW/cm illumination intensity. Read More

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http://dx.doi.org/10.1007/s11468-018-0720-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6280839PMC
March 2018
2 Reads

Physics Models of Plasmonics: Single Nanoparticle, Complex Single Nanoparticle, Nanodimer, and Single Nanoparticle over Metallic Thin Film.

Authors:
Wenbing Li

Plasmonics 2018 24;13(3):997-1014. Epub 2017 May 24.

Institute for Frontier Materials, Deakin University, Locked Bag 20000, Geelong, VIC 3220 Australia.

The physics models of plasmonics for single nanoparticle, complex single nanoparticle, nanodimer, and single nanoparticle over a metallic thin film with an isolation layer, have been reviewed in this article. In nanoscale, the localized plasmonics from the single nanoparticle, hybrid single nanoparticle, and nanodimer, can be illustrated by classical electrodynamics. When the space of a nanodimer downs to subnanometer, the classical electrodynamics would fail to predict the resonance spectrum or dispersion of the nanostructures. Read More

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http://link.springer.com/10.1007/s11468-017-0598-x
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http://dx.doi.org/10.1007/s11468-017-0598-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5948253PMC
May 2017
4 Reads

Large-Area Two-Dimensional Plasmonic Meta-Glasses and Meta-Crystals: a Comparative Study.

Plasmonics 2017 8;12(5):1381-1390. Epub 2016 Oct 8.

Physikalisches Institut and Research Center SCoPE, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.

The geometrical arrangement of metallic nanoparticles plays a crucial role on the optical response of nanoplasmonic samples due to particle-particle interactions. In this work, large-area, two-dimensional meta-glasses (random arrangements) and meta-crystals (periodic arrangements) made of identical metallic nanoparticles are investigated for three different particle densities of 5, 10, and 15 discs/μm. A direct comparison between random and periodically ordered arrays is presented. Read More

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http://dx.doi.org/10.1007/s11468-016-0397-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5599453PMC
October 2016
3 Reads

The Influence of Particle Size Distribution and Shell Imperfections on the Plasmon Resonance of Au and Ag Nanoshells.

Plasmonics 2017 8;12(3):929-945. Epub 2016 Aug 8.

DWI - Leibniz Institute for Interactive Materials e.V., Forckenbeckstr. 50, 52056 Aachen, Germany.

Au and Ag nanoshells are of interest for a wide range of applications. The plasmon resonance of such nanoshells is the property of interest and can be tuned in a broad spectral regime, ranging from the ultraviolet to the mid-infrared. To date, a large number of manuscripts have been published on the optics of such nanoshells. Read More

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http://dx.doi.org/10.1007/s11468-016-0345-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5420003PMC
August 2016
21 Reads

Spectral Response of Metallic Optical Antennas Driven by Temperature.

Plasmonics 2017 15;12(3):553-561. Epub 2016 Jun 15.

Applied Optics Complutense Group, University Complutense of Madrid, C/ Arcos de Jalón, 118, 28037 Madrid, Spain.

When optical antennas are used as light detectors, temperature changes their spectral response. Using this relation, we determine the spectrum of a light beam from an optical antenna's signal. A numerical evaluation of the temperature-spectral response has been completed with a model for the noise of the device. Read More

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http://dx.doi.org/10.1007/s11468-016-0297-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5420004PMC
June 2016
4 Reads

Transient Optical and Terahertz Spectroscopy of Nanoscale Films of RuO.

Plasmonics 2017 Jun 4;12(3):743-750. Epub 2016 Sep 4.

Chemistry Division, Code 6100, U.S. Naval Research Laboratory, Washington, DC 20375, USA.

Solution-deposited nanoscale films of RuO ("nanoskins") are effective transparent conductors once calcined to 200 °C. Upon heating the nanoskins to higher temperature the nanoskins show increased transmission at 550 nm. Electronic microscopy and X-ray diffraction show that the changes in the optical spectrum are accompanied by the formation of rutile RuO nanoparticles. Read More

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http://dx.doi.org/10.1007/s11468-016-0321-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5424710PMC
June 2017
49 Reads

Dielectric Function for Gold in Plasmonics Applications: Size Dependence of Plasmon Resonance Frequencies and Damping Rates for Nanospheres.

Plasmonics 2016;11:941-951. Epub 2015 Nov 14.

Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland.

Realistic representation of the frequency dependence of dielectric function of noble metals has a significant impact on the accuracy of description of their optical properties and farther applications in plasmonics, nanoscience, and nanotechnology. Drude-type models successfully used in describing material properties of silver, for gold are known to be not perfect above the threshold energy at 1.8 eV. Read More

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http://dx.doi.org/10.1007/s11468-015-0128-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4875142PMC
November 2015
8 Reads

Multi-mode Hybrid Plasmonic Waveguides with Enhanced Confinement and Propagation.

Plasmonics 2016;11:763-769. Epub 2015 Oct 10.

Department of Physics, College of Liberal Arts and Sciences, St. John's University, 8000 Utopia Parkway, Jamaica, NY 11439 USA.

A hybrid waveguide, which consists of a dielectric wire above a dielectric-metal interface, has been previously proposed to achieve high confinement with low loss. By exciting this geometry with an aperture in the metal that takes advantage of the extraordinary transmission through subwavelength apertures, it is possible to strongly couple to multiple modes. The real part of the fundamental mode is in fact capable of exceeding the index of refraction of all the materials used while maintaining a manageable imaginary part, as a result of appropriate choice of materials for the dielectric wire and the metal. Read More

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http://dx.doi.org/10.1007/s11468-015-0107-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4875127PMC
October 2015
3 Reads

Plasmons in Finite Spherical Electrolyte Systems: RPA Effective Jellium Model for Ionic Plasma Excitations.

Plasmonics 2016;11:637-651. Epub 2015 Oct 5.

Department of Quantum Technology, Wrocław University of Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland.

Plasmons are fundamental collective excitations in many particle charged systems like in free electron liquid in metals, high energy nuclear plasma in solar core or in fusion devices, in ion gas in ionosphere or in intra- and inter-galactic gas clouds. Plasmons play a central role also in small systems, in particular in metallic nanoparticles and in their arrays allowing for subdiffraction light manipulation. In analogy to metallic nanoparticles, we have developed description of the soft plasmonics in finite electrolyte systems confined in micrometer scale by insulating membranes. Read More

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http://dx.doi.org/10.1007/s11468-015-0064-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4792370PMC
October 2015
6 Reads

Optimizing Nanoplasmonic Biosensor Sensitivity with Orientated Single Domain Antibodies.

Plasmonics 2015;10(6):1649-1655. Epub 2015 May 26.

Center for Bio/Molecular Science and Engineering, Code 6900, Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375 USA.

Localized surface plasmon resonance (LSPR) spectroscopy and imaging are emerging biosensor technologies which tout label-free biomolecule detection at the nanoscale and ease of integration with standard microscopy setups. The applicability of these techniques can be limited by the restrictions that surface-conjugated ligands must be both sufficiently small and orientated to meet analyte sensitivity requirements. We demonstrate that orientated single domain antibodies (sdAb) can optimize nanoplasmonic sensitivity by comparing three anti-ricin sdAb constructs to biotin-neutravidin, a model system for small and highly orientated ligand studies. Read More

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http://dx.doi.org/10.1007/s11468-015-9969-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4644190PMC
May 2015
9 Reads

Optical Response of Silver Nanoneedles on a Mirror.

Plasmonics 2015;10(5):1089-1096. Epub 2015 Feb 25.

Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands ; Nanophotonics-Physics of Devices, Debye Institute for Nanomaterials Science, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands.

Plasmonic properties of metal nanostructures are appealing due to their potential to enhance photovoltaics or sensing performance. Our aim was to identify the plasmonic characteristics of silver nanoneedles on a reflective layer in the polarized optical response. Experimental ellipsometry results are complemented by finite-difference time-domain (FDTD) calculations. Read More

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http://dx.doi.org/10.1007/s11468-015-9900-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4567595PMC
February 2015
3 Reads

Identification of Plasmonic Modes in Parabolic Cylinder Geometry by Quasi-Separation of Variables.

Plasmonics 2015;10:165-182. Epub 2014 Oct 1.

Department of Electrical, Electronics and Computer Engineering, Fukui University of Technology, Fukui, 910-8505 Japan.

This paper describes the plasmonic modes in the parabolic cylinder geometry as a theoretical complement to the previous paper (J Phys A 42:185401) that considered the modes in the circular paraboloidal geometry. In order to identify the plasmonic modes in the parabolic cylinder geometry, analytic solutions for surface plasmon polaritons are examined by solving the wave equation for the magnetic field in parabolic cylindrical coordinates using quasi-separation of variables in combination with perturbation methods. The examination of the zeroth-order perturbation equations showed that solutions cannot exist for the parabolic metal wedge but can be obtained for the parabolic metal groove as standing wave solutions indicated by the even and odd symmetries. Read More

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http://dx.doi.org/10.1007/s11468-014-9791-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4295033PMC
October 2014
4 Reads

From a Laboratory Exercise for Students to a Pioneering Biosensing Technology.

Plasmonics 2014 16;9(4):741-751. Epub 2014 Jan 16.

Biosensors and Bioelectronics Centre, Department of Physics, Chemistry and Biology, Linköping University, 581 83 Linköping, Sweden.

Surface plasmon resonance (SPR) for biosensing was demonstrated 30 years ago. In the present contribution, its general background is described together with the necessary developments both in instrumentation and surface chemistry, leading to the final so-called BIAcore technology. The description is naturally colored by my personal opinion of the developments. Read More

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http://dx.doi.org/10.1007/s11468-013-9654-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4145188PMC
January 2014
16 Reads

Near and Far-Field Properties of Nanoprisms with Rounded Edges.

Plasmonics 2014 7;9:607-614. Epub 2014 Mar 7.

Faculty of Technical Physics, Poznan University of Technology, Nieszawska 13a, 60-965 Poznań, Poland.

Photonic devices can be developed, and their working principle can be understood only by considering the phenomena taking place at the nanoscale level. Optical properties of plasmonic structures depend on their geometric parameters and are sensitive to them. Recently, many advanced methods for the preparation of nanostructures have been proposed; however still, the geometric parameters are inaccurate. Read More

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http://dx.doi.org/10.1007/s11468-014-9671-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4018484PMC
March 2014
4 Reads

SERS Properties of Gold Nanorods at Resonance with Molecular, Transverse, and Longitudinal Plasmon Excitations.

Plasmonics 2014 7;9:581-593. Epub 2014 Mar 7.

Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy ; INSTM, University of Padova, Via Marzolo 1, 35131 Padova, Italy.

The amplification of Raman signals of the heteroaromatic cation 1-(N-methylpyrid-4-yl)-2-(N-methylpyrrol-2-yl)ethylene ()) bound to Au nanorods (NRs) was investigated at different excitation wavelengths to study the effect of the laser resonance with the absorption band of the moiety and with the two plasmon oscillation modes of the NR. Two different derivatives, differing in the length of the alkyl chain bearing the anchoring group, were used as target molecules. Raman spectra obtained exciting at 514 or at 785 nm (i. Read More

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http://dx.doi.org/10.1007/s11468-014-9669-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4018483PMC
March 2014
20 Reads
1 Citation
2.240 Impact Factor

Ultrafast Optical Properties of Dense Electron Gas in Silicon Nanostructures.

Plasmonics 2014 28;9:545-551. Epub 2013 Dec 28.

Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, Université de Strasbourg, BP 43, 23 rue du Loess, 67034 Strasbourg Cedex 02, France.

We investigate the ultrafast dynamics of carriers in a silicon nanostructure by performing spectrally resolved femtosecond spectroscopy measurements with a supercontinuum probe. The nanostructure consists of a 158-nm-thick crystalline Si layer on top of which a SiO passivation layer leads to a very high quality of the Si surface. In addition, a dielectric function approach, including contributions from a Drude part and interband transitions, combined with the Transition Matrix Approximation is used to model the photogenerated carrier dynamics. Read More

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http://dx.doi.org/10.1007/s11468-013-9658-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4018487PMC
December 2013
3 Reads

Plasmon-Enhanced Fluorescence Biosensors: a Review.

Plasmonics 2014;9:781-799. Epub 2013 Dec 28.

AIT-Austrian Institute of Technology GmbH, Muthgasse 11, Vienna, 1190 Austria.

Surfaces of metallic films and metallic nanoparticles can strongly confine electromagnetic field through its coupling to propagating or localized surface plasmons. This interaction is associated with large enhancement of the field intensity and local optical density of states which provides means to increase excitation rate, raise quantum yield, and control far field angular distribution of fluorescence light emitted by organic dyes and quantum dots. Such emitters are commonly used as labels in assays for detection of chemical and biological species. Read More

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http://dx.doi.org/10.1007/s11468-013-9660-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4846700PMC
December 2013
50 Reads

Effects of Carrier Confinement and Intervalley Scattering on Photoexcited Electron Plasma in Silicon.

Plasmonics 2013 4;8:1643-1646. Epub 2013 Jun 4.

Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland ; Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, Université de Strasbourg, BP 43, 23 rue du Loess, 67034 Strasbourg, France.

The ultrafast reflectivity of silicon, excited and probed with femtosecond laser pulses, is studied for different wavelengths and energy densities. The confinement of carriers in a thin surface layer delimited by a nanoscale Si-layered system buried in a Si heavily-doped wafer reduces the critical density of carriers necessary to create the electron plasma by a factor of ten. We performed two types of reflectivity measurements, using either a single beam or two beams. Read More

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http://dx.doi.org/10.1007/s11468-013-9582-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3827834PMC
June 2013
3 Reads

Theoretical Study of the Local Surface Plasmon Resonance Properties of Silver Nanosphere Clusters.

Plasmonics 2013 20;8:1351-1360. Epub 2013 Apr 20.

School of Physics and Electronic Engineering, Anqing Normal University, Anqing, 246011 China.

The local surface plasmon resonance properties in systems consisting of silver nanosphere clusters are studied by Green's function. The extinction, absorption, and scattering efficiencies band of two, three, and more silver nanospheres clusters are discussed in detail. The clusters show new types of the local surface plasmon resonances compared with single silver nanosphere. Read More

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http://dx.doi.org/10.1007/s11468-013-9541-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3744653PMC
April 2013
4 Reads

On Plasmon Polariton Propagation Along Metallic Nano-Chain.

Authors:
Witold A Jacak

Plasmonics 2013 28;8:1317-1333. Epub 2013 Mar 28.

Institute of Physics, Wroclaw University of Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland.

The collective wave type plasmon polariton self-modes in the metallic (Au, Ag) nano-chain were determined and analyzed with respect to the nano-sphere size and chain separation parameters. At some regions for parameters, the undamped modes were identified when the interaction had been assumed as the near-field-zone dipole coupling. These modes were found on the rim of stability of the linear theory, which indicates artifact of the model of near-field coupling. Read More

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http://dx.doi.org/10.1007/s11468-013-9528-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3744655PMC
March 2013
12 Reads

Modification of Emission Properties of ZnO Layers due to Plasmonic Near-Field Coupling to Ag Nanoislands.

Plasmonics 2013 Jun 12;8(2):913-919. Epub 2013 Feb 12.

Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69 St., 00-681 Warszawa, Poland.

A simple fabrication method of silver (Ag) nanoislands on ZnO films is presented. Continuous wave and time-resolved photoluminescence and transmission are employed to investigate modifications of visible and UV emissions of ZnO brought about by coupling to localized surface plasmons residing on Ag nanoislands. The size of the nanoislands, determining their absorption and scattering efficiencies, is found to be an important factor governing plasmonic modification of optical response of ZnO films. Read More

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http://dx.doi.org/10.1007/s11468-013-9490-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3646165PMC
June 2013
13 Reads

Terahertz Dipole Nanoantenna Arrays: Resonance Characteristics.

Plasmonics 2013 Mar 24;8(1):133-138. Epub 2012 Aug 24.

Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy.

Resonant dipole nanoantennas promise to considerably improve the capabilities of terahertz spectroscopy, offering the possibility of increasing its sensitivity through local field enhancement, while in principle allowing unprecedented spatial resolutions, well below the diffraction limit. Here, we investigate the resonance properties of ordered arrays of terahertz dipole nanoantennas, both experimentally and through numerical simulations. We demonstrate the tunability of this type of structures, in a range (∼1-2 THz) that is particularly interesting and accessible by means of standard zinc telluride sources. Read More

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http://dx.doi.org/10.1007/s11468-012-9439-0DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3597338PMC
March 2013
9 Reads
3 Citations
2.240 Impact Factor

Antireflection TiO Coating with Plasmonic Metal Nanoparticles for Silicon Solar Cells.

Plasmonics 2013 Mar 7;8(1):41-43. Epub 2012 Jul 7.

Institute of Metallurgy and Materials Science PAS, Reymonta 25, 30-059 Kraków, Poland.

It is known that the light scattering from the metal particles deposited on the surfaces of cells can be used for increasing light trapping in the solar cells. In this work, plasmonic structures are composite materials that consisted of silver nanoparticles embedded in dielectric films of TiO -used as cell antireflection coating. The films are deposited by sol-gel method using spin-on technique. Read More

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http://dx.doi.org/10.1007/s11468-012-9412-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3597332PMC
March 2013
9 Reads

Reflection-mode TERS on Insulin Amyloid Fibrils with Top-Visual AFM Probes.

Plasmonics 2013 Mar 15;8(1):25-33. Epub 2012 Jun 15.

Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.

Tip-enhanced Raman spectroscopy provides chemical information while raster scanning samples with topographical detail. The coupling of atomic force microscopy and Raman spectroscopy in top illumination optical setup is a powerful configuration to resolve nanometer structures while collecting reflection mode backscattered signal. Here, we theoretically calculate the field enhancement generated by TER spectroscopy with top illumination geometry and we apply the technique to the characterization of insulin amyloid fibrils. Read More

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http://dx.doi.org/10.1007/s11468-012-9385-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3597279PMC
March 2013
23 Reads

Engineering Au Nanoparticle Arrays on SiO Glass by Pulsed UV Laser Irradiation.

Plasmonics 2013 Mar 17;8(1):105-113. Epub 2012 Aug 17.

Photophysics Department, The Szewalski Institute, Polish Academy of Sciences, 14 Fiszera St, 80-231 Gdańsk, Poland.

We study semi-regular arrays of Au nanoparticles (NP) obtained via UV laser irradiation of thin Au films on glass substrate. The NP structures are prepared from films of a thickness up to 60 nm produced by discharge sputtering or pulsed laser deposition, and annealed by nanosecond laser pulses at 266 or 308 nm, respectively, at fluencies in the range of 60-410 mJ/cm. For the rare- and close-packed NP structures, consistent description of optical properties is derived from microscopic observation, measurements of the absorption, and Raman spectra, and modeling of the near-field intensity distributions. Read More

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http://dx.doi.org/10.1007/s11468-012-9428-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3597268PMC
March 2013
9 Reads

Extraordinary Transmission of Three-Dimensional Crescent-like Holes Arrays.

Plasmonics 2012 Jun 22;7(2):221-227. Epub 2011 Nov 22.

We developed a method to fabricate a periodic array of three-dimensional crescent-like holes (3DCLH) via an inverted hemispherical colloidal lithography. It is found that there exists an extraordinary optical transmission in this non-planar perforated periodic array of 3DCLH when the electric field of the incident light is perpendicular to the cross-line of the crescent-like hole. This extraordinary optical peak is insensitive with the incident angles and sensitive with the angle between the electric field of the incident light to the cross-line of the 3DCLH. Read More

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http://dx.doi.org/10.1007/s11468-011-9297-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3389236PMC
June 2012
4 Reads

Absorption Enhancement in Peridinin-Chlorophyll-Protein Light-Harvesting Complexes Coupled to Semicontinuous Silver Film.

Plasmonics 2012 Mar 24;7(1):115-121. Epub 2011 Aug 24.

We report on experimental and theoretical studies of plasmon-induced effects in a hybrid nanostructure composed of light-harvesting complexes and metallic nanoparticles in the form of semicontinuous silver film. The results of continuous-wave and time-resolved spectroscopy indicate that absorption of the light-harvesting complexes is strongly enhanced upon coupling with the metallic film spaced by 25 nm of a dielectric silica layer. This conclusion is corroborated by modeling, which confirms the morphology of the silver island film. Read More

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http://dx.doi.org/10.1007/s11468-011-9283-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3297747PMC
March 2012
37 Reads

Theoretical Analysis the Optical Properties of Multi-coupled Silver Nanoshell Particles.

Plasmonics 2011 Dec 23;6(4):705-713. Epub 2011 Jul 23.

The surface plasmon resonances of silver nanoshell particles are studied by Green's function. The nanoshell system of plasmon resonances results from the coupling of the inner and outer shell surface plasmon. The shift of the nanoshell plasmon resonances wavelength is plotted against with different dielectric environments, several different dielectric cores, the ratio of the inner and outer radius, and also its assemblies. Read More

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http://dx.doi.org/10.1007/s11468-011-9254-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3204110PMC
December 2011
4 Reads

Gold Micro-Flowers: One-Step Fabrication of Efficient, Highly Reproducible Surface-Enhanced Raman Spectroscopy Platform.

Plasmonics 2011 Dec 13;6(4):697-704. Epub 2011 Jul 13.

We present a new method enabling simultaneous synthesis and deposition of gold micro-flowers (AuMFs) on solid substrates in a one-pot process that uses two reagents, auric acid and hydroxylamine hydrochloride, in aqueous reaction mixture. The AuMFs deposited onto the substrate form mechanically stable gold layer of expanded nanostructured surface. The morphology of the AuMFs depends on and can be controlled by the composition of the reaction solution as well as by the reaction time. Read More

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http://link.springer.com/10.1007/s11468-011-9253-0
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http://dx.doi.org/10.1007/s11468-011-9253-0DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3204098PMC
December 2011
7 Reads

Surface Plasmon Polariton Excitation in Metallic Layer Via Surface Relief Gratings in Photoactive Polymer Studied by the Finite-Difference Time-Domain Method.

Plasmonics 2011 Sep 11;6(3):541-546. Epub 2011 May 11.

Institute of Physical and Theoretical Chemistry, Wroclaw University of Technology, Wroclaw, Poland.

We performed numerical investigations of surface plasmon excitation and propagation in structures made of a photochromic polymer layer deposited over a metal surface using the finite-difference time-domain method. We investigated the process of light coupling into surface plasmon polariton excitation using surface relief gratings formed on the top of a polymer layer and compared it with the coupling via rectangular ridges grating made directly in the metal layer. We also performed preliminary studies on the influence of refractive index change of photochromic polymer on surface plasmon polariton propagation conditions. Read More

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http://dx.doi.org/10.1007/s11468-011-9234-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3151570PMC
September 2011
6 Reads

Fully Metal-Coated Scanning Near-Field Optical Microscopy Probes with Spiral Corrugations for Superfocusing under Arbitrarily Oriented Linearly Polarised Excitation.

Plasmonics 2011 Jun 17;6-6(2):327-336. Epub 2011 Feb 17.

We study the effect of a spiral corrugation on the outer surface of a fully metal-coated scanning near-field optical microscopy (SNOM) probe using the finite element method. The introduction of a novel form of asymmetry, devoid of any preferential spatial direction and covering the whole angular range of the originally axisymmetric tip, allows attaining strong field localization for a linearly polarised mode with arbitrary orientation. Compared to previously proposed asymmetric structures which require linearly polarised excitation properly oriented with respect to the asymmetry, such a configuration enables significant simplification in mode injection. Read More

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http://link.springer.com/10.1007/s11468-011-9208-5
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http://dx.doi.org/10.1007/s11468-011-9208-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3094663PMC
June 2011
9 Reads

Performance of Scanning Near-Field Optical Microscope Probes with Single Groove and Various Metal Coatings.

Plasmonics 2011 Mar 17;6(1):11-18. Epub 2010 Sep 17.

We investigate the performance of a simple corrugated aperture scanning near-field optical microscope (SNOM) probe with various cladding metals. The probes have only one corrugation, however, they offer increased transmission over both uncorrugated probes and those with many grooves. Enhancement of light throughput results from excitation of surface plasmons at the corrugation at the core-cladding interface. Read More

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http://dx.doi.org/10.1007/s11468-010-9163-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3062778PMC
March 2011
5 Reads

Fluorescence Quenching of CdTe Nanocrystals by Bound Gold Nanoparticles in Aqueous Solution.

Plasmonics 2008 Mar;3(1):3-11

Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, MD 21201, USA.

Water-soluble gold nanoparticles with an average diameter of 5 nm were prepared with carboxylic acid terminated thiol ligands. These ligands contain zero to eight methylene moieties. CdTe nanocrystals with an average diameter of 5 nm were synthesized with aminoethanethiol capping. Read More

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http://dx.doi.org/10.1007/s11468-007-9047-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2772157PMC
March 2008
3 Reads

A Comparative Plasmonic Study of Nanoporous and Evaporated Gold Films.

Plasmonics 2008 Mar 8;3(1):13-20. Epub 2008 Jan 8.

Previously, we have reported that nanoporous gold (NPG) films prepared by a chemical dealloying method have distinctive plasmonic properties, i.e., they can simultaneously support localized and propagating surface plasmon resonance modes (l-SPR and p-SPR, respectively). Read More

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http://dx.doi.org/10.1007/s11468-007-9048-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2758361PMC
March 2008
6 Reads

Phase Transition and Optical Properties of DNA-Gold Nanoparticle Assemblies.

Plasmonics 2007 Aug;2(4):193-199

Institute of Physics, Chinese Academy of Sciences, Beijing, People's Republic of China.

We review recent work on DNA-linked gold nanoparticle assemblies. The synthesis, properties, and phase behavior of such DNA-gold nanoparticle assemblies are described. These nanoparticle assemblies have strong optical extinction in the ultraviolet and visible light regions; hence, the technique is used to study the kinetics and phase transitions of DNA-gold nanoparticle assemblies. Read More

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http://dx.doi.org/10.1007/s11468-007-9034-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2714644PMC
August 2007
3 Reads

Single-Molecule Studies of Enhanced Fluorescence on Silver Island Films.

Plasmonics 2007 Mar;2(1):1-4

Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Baltimore, MD 21201, USA.

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http://dx.doi.org/10.1007/s11468-007-9023-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2744991PMC
March 2007
3 Reads

Plasmonics in Biology and Plasmon-Controlled Fluorescence.

Plasmonics 2006 Mar;1(1):5-33

Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland at Baltimore, 725 West Lombard Street, Baltimore, MD 21201, USA.

Fluorescence technology is fully entrenched in all aspects of biological research. To a significant extent, future advances in biology and medicine depend on the advances in the capabilities of fluorescence measurements. As examples, the sensitivity of many clinical assays is limited by sample autofluorescence, single-molecule detection is limited by the brightness and photostability of the fluorophores, and the spatial resolution of cellular imaging is limited to about one-half of the wavelength of the incident light. Read More

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http://dx.doi.org/10.1007/s11468-005-9002-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2772160PMC
March 2006
15 Reads

Microwave-Accelerated and Metal-Enhanced Fluorescence Myoglobin Detection on Silvered Surfaces: Potential Application to Myocardial Infarction Diagnosis.

Plasmonics 2006 Mar 1;1(1):53-59. Epub 2006 Mar 1.

In this short paper, we describe a novel approach to both significantly accelerate and optically amplify fluorescence-based immunoassays. Our approach utilizes metal-enhanced fluorescence (MEF) to intrinsically optically amplify fluorescence signatures, which, when combined with the use of low-power microwaves to kinetically accelerate assays, provides for both ultrafast and ultrabright immunoassays. Surprisingly, the use of low-power microwaves and silver nanostructures provides for localized heating, concentrating the effect to the particles themselves as compared to the generic heating of the high dielectric assay fluid. Read More

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http://dx.doi.org/10.1007/s11468-006-9006-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2678713PMC
March 2006
6 Reads
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