1,893 results match your criteria Plasmonics [Journal]
Adv Mater 2018 Dec 14:e1806479. Epub 2018 Dec 14.
Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan.
The second harmonic generation (SHG) of vertical and planar split-ring resonators (SRRs) that are broken centro-symmetry configurations at the interface of metal surface and air is investigated. Strong interactions, better electromagnetic field confinements, and less leakage into the substrate for vertical SRRs are found. Experimental results show a 2. Read More
Nanotechnology 2018 Dec 3. Epub 2018 Dec 3.
Institute for Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, Dresden, 01328, GERMANY.
We report a strong shift of the plasma resonance in highly doped GaAs/InGaAs core/shell nanowires for intense infrared excitation observed by scattering-type scanning near-field infrared microscopy. The studied nanowires show a sharp plasma resonance at a photon energy of about 125 meV in the case of continuous-wave excitation by a CO<sub>2</sub> laser. Probing the same nanowires with the pulsed free-electron laser with peak electric field strengths up to several 10 kV/cm reveals a power-dependent redshift to about 95 meV and broadening of the plasmonic resonance. Read More
Nat Photonics 2018 Dec 29;12(12):749-753. Epub 2018 Oct 29.
ETH Zurich, Institute of Electromagnetic Fields (IEF), 8092 Zurich, Switzerland.
To cope with the high bandwidth requirements of wireless applications1, carrier frequencies are shifting towards the millimetre-wave and terahertz bands2-5. Conversely, data is normally transported to remote wireless antennas by optical fibres. Therefore, full transparency and flexibility to switch between optical and wireless domains would be desirable6,7. Read More
Nanotechnology 2019 Feb;30(5):055301
Department of Physics and London Centre for Nanotechnology, King's College London, Strand, London, WC2R 2LS, United Kingdom.
Metamaterials and metasurfaces provide unprecedented opportunities for designing light-matter interactions. Optical properties of hyperbolic metamaterials with meta-atoms based on plasmonic nanorods, important in nonlinear optics, sensing and spontaneous emission control, can be tuned by varying geometrical sizes and arrangement of the meta-atoms. At the same time the role of the shape of the meta-atoms forming the array has not been studied. Read More
Chemistry 2018 Dec 3. Epub 2018 Dec 3.
CNRS, Cemes, 29 Rue J. Marvig, BP 94347, 31055, Toulouse, FRANCE.
The field of long acenes, the narrowest of the zig-zag graphene nanoribbons, has been an area of significant interest in the past decade due to potential applications in organic electronics, spintronics and plasmonics. However their low solubility and high reactivity has so far hindered their preparation on large scales. We report here a concise strategy for the synthesis of higher acenes through Diels-Alder condensation of arynes with a protected tetraene ketone. Read More
Biosensors (Basel) 2018 Dec 1;8(4). Epub 2018 Dec 1.
Chemistry Department of Lomonosov, Moscow State University, 119991 Moskva, Russia.
Biosensing requires fast, selective, and highly sensitive real-time detection of biomolecules using efficient simple-to-use techniques. Due to a unique capability to focus light at nanoscale, plasmonic nanostructures provide an excellent platform for label-free detection of molecular adsorption by sensing tiny changes in the local refractive index or by enhancing the light-induced processes in adjacent biomolecules. This review discusses the opportunities provided by surface plasmon resonance in probing the chirality of biomolecules as well as their conformations and orientations. Read More
Nanomaterials (Basel) 2018 Dec 1;8(12). Epub 2018 Dec 1.
Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Engineering Technology Research Center for High-Performance Organic and Polymer Photoelectric Functional Films, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China.
Gold nanocrystals have attracted considerable attention due to their excellent physical and chemical properties and their extensive applications in plasmonics, spectroscopy, biological detection, and nanoelectronics. Gold nanoparticles are able to be readily modified and arranged with DNA materials and protein molecules, as well as viruses. Particularly DNA materials with the advantages endowed by programmability, stability, specificity, and the capability to adapt to functionalization, have become the most promising candidates that are widely utilized for building plenty of discrete gold nanoarchitectures. Read More
Nanoscale 2018 Dec;10(48):22946-22953
Leibniz Institute of Surface Engineering (IOM), Permoserstr. 15, D-04318 Leipzig, Germany.
Two-dimensional van-der-Waals-bonded chalcogenide heterostructures have recently received a lot of attention due to promising applications in the fields of photonics, plasmonics and data storage. Of particular interest is the interfacial switching process inherent in these structures, which is assumed to occur locally at the van-der-Waals interfaces and thus represents an intracrystalline transition. However, detailed experimental studies on the underlying mechanism are still lacking. Read More
Opt Express 2018 Oct;26(21):27089-27100
Recently, it was noted that losses in plasmonics can also enable several useful optical functionalities. One class of structures that can maximize absorption are metal insulator metal systems. Here, we study 3-layer systems with a nano-composite metal layer as top layer. Read More
Adv Mater 2018 Nov 23:e1804680. Epub 2018 Nov 23.
State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, 610209, China.
In the past centuries, the scale of engineering optics has evolved toward two opposite directions: one is represented by giant telescopes with apertures larger than tens of meters and the other is the rapidly developing micro/nano-optics and nanophotonics. At the nanoscale, subwavelength light-matter interaction is blended with classic and quantum effects in various functional materials such as noble metals, semiconductors, phase-change materials, and 2D materials, which provides unprecedented opportunities to upgrade the performance of classic optical devices and overcome the fundamental and engineering difficulties faced by traditional optical engineers. Here, the research motivations and recent advances in subwavelength artificial structures are summarized, with a particular emphasis on their practical applications in super-resolution and large-aperture imaging systems, as well as highly efficient and spectrally selective absorbers and emitters. Read More
Yi Chuan 2018 Nov;40(11):929-937
CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing 100101, China.
The DNA sequencing technology invented in 1970's has been a leading tool for genomics and its sequel ─ precision medicine. The needs for advancement of the DNA sequencing technology comes from increasing resolutions in cellular and molecular studies, not only DNA or cDNA sequences but also their covalent modifications, such as various kinds of DNA or RNA methylations. Sequencing single RNA molecules directly without conversion into cDNAs appears to be the last generation of nucleotide sequencers. Read More
Acc Chem Res 2018 Nov 21. Epub 2018 Nov 21.
Department of Chemistry , University of Toledo , Toledo , Ohio 43606 , United States.
Silver and gold molecular nanoparticles (mNPs) are a relatively new class of molecular materials of fundamental interest. They are high-nuclearity metal-organic compounds, with ligated metal cores, where the different character of bonding in the ligand shell and metal core gives rise to many of the unique properties of these materials. Research has primarily focused on gold mNPs, due to their good stability and the ease with which they may be synthesized and processed. Read More
Appl Opt 2018 Sep;57(27):7740-7749
A dielectric microsphere is a multifunctional platform to manipulate light in microscale by nanofocusing, optical whispering gallery resonance, and unidirectional antenna. Dielectric microsphere arrays (MSAs) have demonstrated the capability for photoluminescence (PL) and Raman enhancement without plasmonics. In this work, we investigate the effects of excitation power, tilting angle, and temperature on PL enhancement of high-quality zinc oxide (ZnO) single-crystal capping with fused silica MSAs. Read More
Appl Opt 2018 Oct;57(30):9155-9163
Here, reciprocity and Babinet's principles were applied to the design of integrated plasmonic structures on silicon photonic waveguides. Numerical analyses and near-field optical microscopy observations show that one of the hybrid photonic-plasmonic structures exhibits high confinement and enhancement of the electric field, and, through Babinet's principle, the magnetic field of its complementary structure is confined and enhanced as well. Reciprocally, due to the modification of the electric and magnetic local density of states, enhanced emission of electric and magnetic dipoles by Purcell effect were obtained into specific silicon photonic modes. Read More
Biomed Opt Express 2018 Nov 26;9(11):5735-5758. Epub 2018 Oct 26.
Department of Electrical Engineering. Princeton University, NJ 08544, USA.
The ultra-miniaturization of massively multiplexed fluorescence-based bio-molecular sensing systems for proteins and nucleic acids into a chip-scale form, small enough to fit inside a pill (∼ 0.1cm), can revolutionize sensing modalities in-vitro and in-vivo. Prior miniaturization techniques have been limited to focusing on traditional optical components (multiple filter sets, lenses, photo-detectors, etc. Read More
Nat Commun 2018 11 19;9(1):4858. Epub 2018 Nov 19.
State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing, 100871, China.
Strong coupling between two resonance modes leads to the formation of new hybrid modes exhibiting disparate characteristics owing to the reversible exchange of information between different uncoupled modes. Here, we realize the strong coupling between the localized surface plasmon resonance and surface plasmon polariton Bloch wave using multilayer nanostructures. An anticrossing behavior with a splitting energy of 144 meV can be observed from the far-field spectra. Read More
Nano Lett 2018 Nov 20. Epub 2018 Nov 20.
While past works have suggested that the Lorentz magnetic contribution to second harmonic generation from metal nanostructures is negligible as compared to other terms, here we demonstrate a dominant Lorentz contribution from T-shaped apertures in a gold film. The apertures are designed to have overlapping magnetic and electric near-field intensities at the plasmonic resonance. This gives 65% greater nonlinear generation from the Lorentz term than the sum of the other two terms. Read More
Micromachines (Basel) 2018 Aug 30;9(9). Epub 2018 Aug 30.
Historical Museum of Physics and Study & Research Centre "Enrico Fermi", 00184 Roma, Italy.
Solar cells are electrical devices that can directly convert sunlight into electricity. While solar cells are a mature technology, their efficiencies are still far below the theoretical limit. The major losses in a typical semiconductor solar cell are due to the thermalization of electrons in the UV and visible range of the solar spectrum, the inability of a solar cell to absorb photons with energies below the electronic band gap, and losses due to the recombination of electrons and holes, which mainly occur at the contacts. Read More
ACS Appl Mater Interfaces 2018 Nov 27. Epub 2018 Nov 27.
Laboratory of Photonics , Tampere University of Technology , P. O. Box 692, 33101 Tampere , Finland.
The growing interest in solar energy during recent years has spurred on the development of high-efficiency optical absorbers using emerging concepts in plasmonics and metamaterials. Most absorber designs require patterning on a subwavelength scale, making large-scale fabrication expensive or impractical. This study presents an all-metal metasurface with tightly packed, sub-80 nm nanodomes fabricated by template-stripping thin gold films from reusable silicon templates. Read More
Beilstein J Nanotechnol 2018 22;9:2718-2729. Epub 2018 Oct 22.
CNR-IPCF, Istituto per i Processi Chimico-Fisici, Viale F. Stagno D'Alcontres 37, 98168 Messina, Italy.
Tip-enhanced Raman spectroscopy (TERS) has become a well-applied technique for nanospectroscopy, allowing for single molecule sensitivity with sub-nanometer spatial resolution. The demand for efficient, reproducible and cost-effective probes for TERS is increasing. Here we report on a new electrochemical etching protocol to fabricate TERS tips starting from 125 µm diameter gold wires in a reproducible way. Read More
Beilstein J Nanotechnol 2018 15;9:2674-2683. Epub 2018 Oct 15.
Nanophotonics and Metrology Laboratory (NAM), Swiss Federal Institute of Technology Lausanne (EPFL), 1015 Lausanne, Switzerland.
The silencing of the second harmonic generation process from plasmonic nanostructures corresponds to the limited far-field second harmonic radiation despite the huge fundamental electric field enhancement in the interstice between two plasmonic nanoparticles forming a nanodimer. In this article, we report a comprehensive investigation of this effect using a surface integral equation method. Various geometries are considered, including nanoantennas with cylindrical and rectangular arms as well as nanodimers with surface defects. Read More
Beilstein J Nanotechnol 2018 8;9:2657-2664. Epub 2018 Oct 8.
Light, nanomaterials and nanotechnologies (L2n), Institut Charles Delaunay (CNRS), Université de Technologie de Troyes (UTT), 12 rue Marie Curie, CS 42060, 10004 Troyes Cedex, France.
Active plasmonics is a key focus for the development of advanced plasmonic applications. By selectively exciting the localized surface plasmon resonance sustained by the short or the long axis of silver nanorods, we demonstrate a polarization-dependent strong coupling between the plasmonic resonance and the excited state of photochromic molecules. By varying the width and the length of the nanorods independently, a clear Rabi splitting appears in the dispersion curves of both resonators. Read More
ACS Cent Sci 2018 Oct 29;4(10):1303-1314. Epub 2018 Aug 29.
Department of Chemistry, Seoul National University, Seoul 08826, South Korea.
Plasmonics, the study of the interactions between photons and collective oscillations of electrons, has seen tremendous advances during the past decade. Controllable nanometer- and sub-nanometer-scale engineering in plasmonic resonance and electromagnetic field localization at the subwavelength scale have propelled diverse studies in optics, materials science, chemistry, biotechnology, energy science, and various applications in spectroscopy. However, for translation of these accomplishments from research into practice, major hurdles including low reproducibility and poor controllability in target structures must be overcome, particularly for reliable quantification of plasmonic signals and functionalities. Read More
ACS Appl Mater Interfaces 2018 Nov 19. Epub 2018 Nov 19.
Department of Fiber System Engineering , Dankook University , Yongin , Gyeonggi-do 16890 , Korea.
Plasmon-enhanced particle trapping was demonstrated using a hybrid structure of nanoparticles and nanorods. In order to intensify localized surface plasmon resonance (LSPR), gold nanoparticles (AuNPs) were deposited on zinc oxide nanorods (ZnONRs). The synergistic effect caused by the hybrid structure was identified experimentally. Read More
Analyst 2018 Nov 7. Epub 2018 Nov 7.
Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada.
The structural characteristics of plasmonic nanostructures directly influence their plasmonic properties, and therefore, their potential role in applications ranging from sensing and catalysis to light- and energy-harvesting. For a structure to be compatible with a selected application, it is critical to accurately tune the plasmonic properties over a specific spectral range. Fabricating structures that meet these stringent requirements remains a significant challenge as plasmon resonances are generally narrow with respect to the considered selected spectral range. Read More
Nano Lett 2018 11 5;18(11):7395-7399. Epub 2018 Nov 5.
Max Planck Institute for Intelligent Systems , Heisenbergstrasse 3 , D-70569 Stuttgart , Germany.
The DNA origami technique has empowered a new paradigm in plasmonics for manipulating light and matter at the nanoscale. This interdisciplinary field has witnessed vigorous growth, outlining a viable route to construct advanced plasmonic architectures with tailored optical properties. However, so far plasmonic systems templated by DNA origami have been restricted to respond to only single stimuli. Read More
J Phys Chem Lett 2018 Nov 15;9(21):6179-6184. Epub 2018 Oct 15.
Nanoscience Center, Department of Chemistry , University of Jyväskylä , 40014 Jyväskylä , Finland.
In nanofabrication, just as in any other craft, the scale of spatial details is limited by the dimensions of the tool at hand. For example, the smallest details of direct laser writing with far-field light are set by the diffraction limit, which is approximately half of the used wavelength. In this work, we overcome this universal assertion by optically forging graphene ripples that show features with dimensions unlimited by diffraction. Read More
Langmuir 2018 Nov 15;34(47):14124-14133. Epub 2018 Nov 15.
Departamento de Química , Universidade Estadual de Maringá , Avenida Colombo 5790 , 87020-900 Maringá , Paraná , Brazil.
Gold nano "breath figure" films are for the first time reported and their function as ideal systems for plasmonics demonstrated. Metal nano-breath figure substrates are metal thin films containing nanohole arrays supported on a solid substrate. Au nanohole arrays are prepared from the dynamic breath figure phenomenon, in which the pore formation is controlled to provide holes smaller than 100 nm. Read More
J Comput Chem 2018 Oct 3. Epub 2018 Oct 3.
Department of Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
First principles electrodyanmics and quantum chemical simulations are performed to gain insights into the underlying mechanisms of the surface enhanced Raman spectra of 22BPY adsorbed on pure Au and Ag as well as on Au-Ag alloy nanodiscs. Experimental SERS spectra from Au and Ag nanodiscs show similar peaks, whereas those from Au-Ag alloy reveal new spectral features. The physical enhancement factors due to surface nano-texture were considered by numerical FDTD simulations of light intensity distribution for the nano-textured Au, Ag, and Au-Ag alloy and compared with experimental results. Read More
Nanomaterials (Basel) 2018 Oct 23;8(11). Epub 2018 Oct 23.
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Inspired by the anisotropic molecular shape and tunable alignment of liquid crystals (LCs), investigations on hybrid nanodevices which combine LCs with plasmonic metasurfaces have received great attention recently. Since LCs possess unique electro-optical properties, developing novel dynamic optical components by incorporating nematic LCs with nanostructures offers a variety of practical applications. Owing to the large birefringence of LCs, the optical properties of metamaterials can be electrically or optically modulated over a wide range. Read More
Nano Lett 2018 11 25;18(11):7343-7349. Epub 2018 Oct 25.
Department of Chemistry and Physics of Materials , University of Salzburg , Jakob Haringer Strasse 2A , A-5020 Salzburg , Austria.
A templated electrochemical technique for patterning macroscopic arrays of single-crystalline Si micro- and nanowires with feature dimensions down to 5 nm is reported. This technique, termed three-dimensional electrochemical axial lithography (3DEAL), allows the design and parallel fabrication of hybrid silicon nanowire arrays decorated with complex metal nano-ring architectures in a flexible and modular approach. While conventional templated approaches are based on the direct replication of a template, our method can be used to perform high-resolution lithography on pre-existing nanostructures. Read More
Nat Commun 2018 10 24;9(1):4413. Epub 2018 Oct 24.
Laboratory of Artificial-Intelligence Nanophotonics, School of Science, RMIT University, Melbourne, Victoria, 3001, Australia.
Complementary metal-oxide-semiconductor (CMOS) technology has provided a highly sensitive detection platform for high-resolution optical imaging, sensing and metrology. Although the detection of optical beams carrying angular momentum have been explored with nanophotonic methods, the metrology of optical angular momentum has been limited to bulk optics. We demonstrate angular-momentum nanometrology through the spatial displacement engineering of plasmonic angular momentum modes in a CMOS-compatible plasmonic topological insulator material. Read More
ACS Sens 2018 Nov 24;3(11):2343-2350. Epub 2018 Oct 24.
Institute for Composites Science Innovation, School of Materials Science and Engineering , Zhejiang University , Hangzhou 310027 , China.
Nanoparticle clusters have important applications in plasmonics and optical sensing fields. Various methods have been used to construct nanoparticle clusters, represented by assembling preprepared nanoparticles using DNA. However, preparation of nanoparticle clusters using a one-step method is still challenging. Read More
Nanoscale 2018 Nov;10(42):19927-19936
Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China.
In this study, two-dimensional (2D), quasi-three-dimensional (3D), and 3D plasmonic photonic crystal (PPC) nanostructures with point-defect cavities were developed and fabricated using direct and reversal nanoimprint lithography. As a result of the hybrid coupling of localized surface plasmon resonance and Fabry-Perot cavity modes, the quasi-3D plasmonic nanoholes showed higher electromagnetic field intensity and sensitivity than the 2D plasmonic nanoholes. Specifically, the sensitivity of the quasi-3D plasmonic nanoholes was 483 nm per refractive index unit (RIU), whereas that of the 2D plasmonic nanoholes was 276 nm RIU-1. Read More
Beilstein J Nanotechnol 2018 27;9:2581-2598. Epub 2018 Sep 27.
Institute of Physics, Goethe University, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany.
Fabrication of three-dimensional (3D) nanoarchitectures by focused electron beam induced deposition (FEBID) has matured to a level that highly complex and functional deposits are becoming available for nanomagnetics and plasmonics. However, the generation of suitable pattern files that control the electron beam's movement, and thereby reliably map the desired target 3D structure from a purely geometrical description to a shape-conforming 3D deposit, is nontrivial. To address this issue we developed several writing strategies and associated algorithms implemented in C++. Read More
Nano Lett 2018 11 25;18(11):7323-7329. Epub 2018 Oct 25.
Center for Advancing Electronics Dresden (cfaed) , Technische Universität Dresden , 01062 Dresden , Germany.
Plasmonic waveguides consisting of metal nanoparticle chains can localize and guide light well below the diffraction limit, but high propagation losses due to lithography-limited large interparticle spacing have impeded practical applications. Here, we demonstrate that DNA-origami-based self-assembly of monocrystalline gold nanoparticles allows the interparticle spacing to be decreased to ∼2 nm, thus reducing propagation losses to 0.8 dB per 50 nm at a deep subwavelength confinement of 62 nm (∼λ/10). Read More
iScience 2018 Oct 5;8:213-221. Epub 2018 Oct 5.
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China; University of Chinese Academy of Sciences, Beijing 100049, P. R. China. Electronic address:
Junctions built from metallic nanoparticles (NPs) can circumvent the diffraction limit and combine molecular/nanoelectronics with plasmonics. However, experimental advances in plasmon-assisted electron transport at the nanoscale have been limited. We construct junctions of a robust, molecule-free, suspended film, built solely from AuNPs, capped by SiO shells (Au@SiO), which give insulating tunneling gaps up to 3. Read More
ACS Nano 2018 Nov 22;12(11):10914-10923. Epub 2018 Oct 22.
State Key Lab of Supramolecular Structure and Materials, College of Chemistry , Jilin University , Changchun 130012 , P.R. China.
Hollow nanocone array (HNCA) films (cm × cm), composed of two Ag and Au nanoshells, are fabricated via a low-cost and efficient colloidal lithography technique. The relative position of the Ag and Au nanoshells can be controlled to generate various chiral asymmetries. A pronounced chiroptical response is observed in the ultraviolet-visible region with the anisotropy factor up to 10, which is rooted in the asymmetric current oscillations and electric field distributions. Read More
ACS Nano 2018 Nov 22;12(11):11316-11322. Epub 2018 Oct 22.
Electrical and Computer Engineering , University of California, San Diego , 9500 Gilman Drive , La Jolla , California 92093 , United States.
An optical metamaterial is capable of manipulating light in nanometer scale that goes beyond what is possible with conventional materials. Taking advantage of this special property, metamaterial-assisted illumination nanoscopy (MAIN) possesses tremendous potential to extend the resolution far beyond conventional structured illumination microscopy. Among the available MAIN designs, hyperstructured illumination that utilizes strong dispersion of a hyperbolic metamaterial (HMM) is one of the most promising and practical approaches, but it is only theoretically studied. Read More
ACS Nano 2018 Nov 18;12(11):11211-11218. Epub 2018 Oct 18.
Department of Chemistry , University of Waterloo , 200 University Avenue West , Waterloo , Ontario N2L 3G1 , Canada.
Degenerately doped metal oxide nanocrystals have emerged as infrared plasmonic materials with promising applications in optoelectronics, surface-enhanced infrared spectroscopies, and sensing. They also have potential for technological applications in electronics and photonics owing to the possibility of coupling between plasmon and exciton in the absence of a heterojunction. Here, we demonstrate the control of excitonic splitting in InO nanocrystals upon excitation with circularly polarized light in an external magnetic field by simultaneous control of the electronic structure of donor defects and the nanocrystal host lattice. Read More
Small 2018 Nov 17;14(48):e1803233. Epub 2018 Oct 17.
Research School of Chemistry, The Australian National University, Canberra, ACT, 2601, Australia.
Durability is still one of the key obstacles for the further development of photocatalytic energy-conversion systems, especially low-dimensional ones. Encouragingly, recent studies show that nanoinsulators such as SiO and MgO exhibit substantially enhanced photocatalytic durability than the typical semiconductor p25 TiO . Extending this knowledge, MgO-Au plasmonic defect nanosystems are developed that combine the stable photoactivity from MgO surface defects with energy-focusing plasmonics from Au nanoparticles (NPs), where Au NPs are anchored onto monodispersed MgO nanotemplates. Read More
J Nanosci Nanotechnol 2019 Jan;19(1):40-46
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha Hunan, 410083, China.
Although much progress has been made on lattice plasmon mode (LPM), there is still a lack of systematic studies on LPM generation; questions remain unanswered on topics such as high-order LPM generation, LPM generation from near-coupling complex elements, and modulation of incidence energy. Here, we systematically evaluated the properties of multiple high-order LPM, energy flow modulation of incident polarization, element, angle of incidence, and hybrid of dual lattice using the finite-difference time-domain method. This study presents a clear illustration of LPM and will help on further development of LPM and plasmonics-based fields. Read More
Proc Natl Acad Sci U S A 2018 10 15;115(44):11168-11173. Epub 2018 Oct 15.
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, School of Physics, Nanjing University, 210093 Nanjing, P. R. China;
The recent renaissance of lithium metal batteries as promising energy storage devices calls for in operando monitoring and control of electrochemical evolution of lithium metal morphologies. While the development of plasmonics has led to significant advancement in real-time and ultrasensitive chemical and biological sensing and surface-enhanced spectroscopies, alkali metals featured by ideal free electron gas models have long been regarded as promising plasmonic materials but seldom been explored due to their high chemical reactivity. Here, we demonstrate the in operando plasmonic monitoring of the electrochemical evolution of lithium metal during battery cycling by taking advantage of selective electrochemical deposition. Read More
Nanoscale Res Lett 2018 Oct 12;13(1):322. Epub 2018 Oct 12.
Institute of Applied Mechanics, National Taiwan University, Taipei, 106, Taiwan.
The plasmon-enhanced spin and orbital rotation of Au dimer, two optically bound nanoparticles (NPs), induced by a circularly polarized (CP) light (plane wave or Gaussian beam) were studied theoretically. Through the optomechanical performances of optical forces and torques, the longitudinal/transverse spin-orbit coupling (SOC) of twisted electromagnetic fields was investigated. The optical forces show that for the long-range interaction, there exist some stable-equilibrium orbits for rotation, where the stable-equilibrium interparticle distances are nearly the integer multiples of wavelength in medium. Read More
Materials (Basel) 2018 Oct 10;11(10). Epub 2018 Oct 10.
Department of Finemechanics, Tohoku University, Miyagi 980-8579, Japan.
A small spectroscope with 25 color sensors was fabricated by combining metamaterial color filters and Si photodiodes. The metamaterial color filters consisted of guided-mode resonant metal gratings with subwavelength two-dimensional periodic structures. Transmittance characteristics of the color filters were designed to obtain peak wavelengths proportional to grating periods. Read More
Comput Struct Biotechnol J 2018 18;16:342-349. Epub 2018 Sep 18.
Technical and Macromolecular Chemistry, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany.
With the introduction of the DNA origami technique, it became possible to rapidly synthesize almost arbitrarily shaped molecular nanostructures at nearly stoichiometric yields. The technique furthermore provides absolute addressability in the sub-nm range, rendering DNA origami nanostructures highly attractive substrates for the controlled arrangement of functional species such as proteins, dyes, and nanoparticles. Consequently, DNAorigami nanostructures have found applications in numerous areas of fundamental and applied research, ranging from drug delivery to biosensing to plasmonics to inorganic materials synthesis. Read More
Nanomaterials (Basel) 2018 Oct 9;8(10). Epub 2018 Oct 9.
Microelectronics-Photonics Graduate Program, 731 W. Dickson St., University of Arkansas, Fayetteville, Arkansas, AR 72701, USA.
We propose and report on the design of a 1-D metallo-dielectric nano-grating on a GaAs substrate. We numerically study the impact of grating period, slit and wire widths, and irradiating angle of incidence on the optical response. The optimal wire width, = 160 nm, was chosen based on previous results from investigations into the influence of wire width and nano-slit dimensions on optical and electrical enhancements in metal-semiconductor-metal photodetectors. Read More
Sci Rep 2018 Oct 4;8(1):14802. Epub 2018 Oct 4.
University of California Los Angeles, Electrical Engineering Department, Los Angeles, 90095, USA.
We report a self-triggered asynchronous optical sampling terahertz spectroscopy system based on a single bidirectional mode-locked fiber laser and plasmonics-enhanced photoconductive nanoantennas. The fiber laser generates two optical mutually coherent pulse trains with a stable repetition rate difference, enabling time-domain terahertz spectroscopy without using any mechanical delay line, stabilization electronics, or external trigger. The resolved terahertz spectra over a 0. Read More
Rep Prog Phys 2018 Nov 1;81(11):116401. Epub 2018 Oct 1.
4th Physics Institute and Research Center SCoPE, University of Stuttgart, Stuttgart 70569, Germany.
The Faraday effect describes the phenomenon that a magnetized material can alter the polarization state of transmitted light. Interestingly, unlike most light-matter interactions in nature, it breaks Lorentz reciprocity. This exceptional behavior is utilized for applications such as optical isolators, which are core elements in communication and laser systems. Read More
Materials (Basel) 2018 Sep 26;11(10). Epub 2018 Sep 26.
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
In the past half-century, surface plasmon resonance in noble metallic nanoparticles has been an important research subject. Recent advances in the synthesis, assembly, characterization, and theories of traditional and non-traditional metal nanostructures open a new pathway to the kaleidoscopic applications of plasmonics. However, accurate and precise models of plasmon resonance are still challenging, as its characteristics can be affected by multiple factors. Read More