Poster session VI
Broadband asymmetric transmission in ultrathin chiral metamaterial
J. H. Shi, Z. P. Li, Y. X. Li
Harbin Engineering University (China) We theoretically and experimentally demonstrate broadband artificial chirality in an ultrathin metamaterial constructed by an array of asymmetrically split ring apertures (ASRA). The anisotropic bilayered metamaterial with chirality exhibits a broadband asymmetric transmission of linearly polarized waves with totally suppressed co-polarization transmission.
Photoconductivity and Structure of Cu(In,Ga)Se2 for Thin Film Solar Sell Application
Hosameldin Helmy Hegazy, Ashraf Ibrahim Abou Alhasan, Fatimah Said Al Juman
King Khalid University (Egypt) Samples of polycrystalline Cu(In0.65, Ga0.35)Se2 bulk as well as thin films have been prepared. The crystal structure of prepared material identified as chalcopyrite structure using x-ray diffraction. Surface analysis was performed using scanning electron microscope and atomic force microscope. The optical energy gap is determined and has the value of 1.35 eV. The steady state and transient photoconductivity measurements illustrated the photosensitivity, recombination processes and the differential lifetime of the generated photo-carriers in the films under investigation.
Amplitude and Phase Controlled THz Metasurface using Silver and Carbon Ink-Jet Printing
Andrew Paulsen (1), Ajay Nahata (2)
(1)Univeristy of Utah (USA), (2)University of Utah (USA) Controlling the amplitude and phase response of an optical device was once thought to be constrained by the bulk material properties of that device. Demonstrations of metasurfaces have shifted this paradigm. We show that the amplitude and phase of a transmitted THz signal through an array of V-shaped antennas can be controlled by varying the conductivity and geometry of the V-shaped structures. These structures are created using conductive silver and resistive carbon ink deposited by a consumer ink-jet printer.
Surface Plasmon in Monolayer Graphene with Liquid Crystal Layer
Victor Y. Reshetnyak (1), Timothy J. Bunning (2), Dean R. Evans (2)
(1)Taras Shevchenko National University (Ukraine), (2)Air Force Research Laboratory (USA) Surface plasmon frequency in monolayer graphene placed between two dielectric layers depends on dielectric constant of layers, Fermi energy, and relief grating period. We suggest using liquid crystal (LC) as one of dielectrics to control surface plasmon in graphene. LC is uniaxial medium with optical axis given by director. Director orientation can be controlled by applied voltage. We find plasmon resonance shift about 70cm-1 for graphene on top of silicon grating with period of 200nm, when director is reoriented.
SOI Forked Grating Coupler for Integrated Optics: Fabrication Tolerances and Efficiency Improvements for Coupling into a Single Mode Fiber
Derek Kosciolek (1), Chris Nadovich (2), David Crouse (1), William Jemison (2)
(1)City College New York (USA), (2)Clarkson University (USA) A novel, low-profile, tunable device capable of detection or emission of optical vortex light beams of specific topological charge is presented. The proposed forked grating design couples a planar dielectric waveguide mode into a free-space propagating beam with orbital angular momentum. To promote coupling into a single mode fiber, methods to diminish power loss across the spatial profile of an emitted beam, as well as enable perfectly vertical coupling, are explored and analyzed.
Probing semiconductor confined excitons decay into Surface Plasmon Polaritons
Fernando de Alencar Sobreira (1), Marcio Teodoro (2), Rodrigo Pereira (1), Euclydes Marega Jr. (1)
(1)Universidade de Sao Paulo (Brazil), (2)Universidade Federal de Sao Carlos (Brazil) The interaction of Surface Plasmon Polaritons with quantum emitters has become very important in the last few years. The ability to design optical devices as well as investigate the physics of strongly interacting systems are some of its applications. In the presentation we show some results on the decay of excitons confined in a semiconductor matrix into SPPs confined in a metallic thin film, an important step toward the investigation of the basic features of SPP-exciton interaction.
Room-temperature Microdisk Microlsers of Perovskites Self-Assembled from Solution
Qing Liao (1), Xue Jin (2), Ke Hu (2), Hongbing Fu (1)
(1)Chinese Academy of Sciences (China), (2)Capital Normal University (China) We report for the first time single-crystalline square microdisks (MDs) of perovskite CH3NH3PbBr3 prepared by using a solution self-assembly method. Single and multiple mode lasing had been achieved in single MDs with different sizes at room temperature. By partial replacement of Br with Cl in mixed perovskites CH3NH3PbClxBr3-x, lasing wavelengths of our WGM MDLs have been tuned from 525 to 557 nm with decreasing x = 1 to x = 0.
Numerical Analysis of Multilayered Structures Composed of Metallic Nanoparticles
Joaquim Junior Isidio de Lima, Vitaly Felix Rodriguez-Esquerre
Federal University of Bahia (Brazil) The absorption and the reflection properties of multilayered plasmonic structures with subwavelength sizes are analyzed in details by using an efficient frequency domain finite element method. The multilayered structures are composed by several layers of metallic nanoparticles of Silver and Gold embedded in dielectric such as amorphous silicon. Peaks of reflection or absorption larger than 80 percent were obtained and their performance over the near infrared can be improved by adequately tuning their geometrical parameters and thickness of the layers.
Standing wave plasmon modes interact in an antenna-coupled nanowire
Jared Day (1), Nicolas Large (2), Peter Nordlander (3), Naomi Halas (3)
(1)City College of New York (USA), (2)Northwestern University (USA), (3)Rice University (USA) We demonstrate the coupling between standing wave plasmonic modes and observe mode-pulling features only previously seen in macroscopic laser cavities. By positioning our Fabry-Perot resonator (nanowire) within the gap of a plasmonic nanoantenna we introduce a passive, hybridization-based coupling between the standing-wave nanowire plasmons themselves through interaction with the antenna structure. Frequency pushing and pulling, and the enhancement and suppression of specific plasmon modes, can be controlled and manipulated by nanoantenna position and shape.
Localized Surface Plasmon Resonance in the IR Regime
Neha Sardana (1), Frank Heyroth (2), Joerg Schilling (3)
(1)Institute of Nano Science and Technology (India), (2)Interdisciplinary center of material science (Germany), (3)Martin Luther University (Germany) Different sizes of disk shaped gold nanoantenna arrays which support extinction spectra in IR are prepared by e-beam lithography, which show localized surface plasmon resonance and Rayleigh anomalies in the range from 1000-1400nm. Embedded quantum dots surrounding the nanoantennas show up to 4-fold photoluminescence enhancement due to the coupling to the surface plasmon lattice resonances for larger disk diameters.
Infrared Thermal Emission by Multipolar Nanoantennas
Marco Centini, Alessio Benedetti, Maria Cristina Larciprete, Alessandro Belardini, Roberto Li Voti, Mario Bertolotti, Concita Sibilia
Universita di Roma La Sapienza (Italy) We studied the far field thermal emission pattern of multipolar nanoantennas of arbitray shapes at a given equilibrium temperature. The numerical investigation was performed by using a method based on the fluctuational electrodynamics approach and on the discretization of the resulting volume integral equation. Our calculations suggest that coherent emission and high directionality can be obtained by taking advantage of multipolar contributions.
Metallic oriented nanowires films for infrared radiation manipulation
Maria Cristina Larciprete, Marco Centini, Roberto Li Voti, Mario Bertolotti, Concita Sibilia
Sapienza Universita di Roma (Italy) We developed a numerical method to model the infrared spectral properties of metal nanowires on a substrate. The combination of homogenization techniques and the transfer matrix method for birefringent layered materials allows to obtain a tool for optimizing the infrared properties of the resulting system. Different in-plane orientations are investigated, while the model also allows the introduction of an off-plane tilt of the nanowires axes. Possible applications such as infrared polarizers, polarizing beam splitter and polarization rotators are discussed.
Radially Inhomogeneous and Anisotropic Nanoporous Anodic Alumina Microtubes as Metamaterial Optical Fibers
Dheeraj Pratap, Subramaniam Ramakrishna
Indian Institute of Technology Kanpur (India) The acid anodization of a cylindrically symmetric micro-aluminium wire yields a cylindrical nanoporous alumina microtube where the nanopores are radially oriented towards the cylindrical axis. The nanopore diameter decreases linearly towards the axis along with the periodicty of the nanopores along the azimuthal direction while the periodicity along z-axis remains constant. Thus, a cylindrical waveguide that is radially inhomogeneous and anisotropic results in which light at visible and NIR frequencies can be guided.
Saturable absorption by surface plasmon resonance effects in zinc nanoparticles onto the core of an optical fiber
Placido Zaca (1), Jose G. Ortega (2), Fenando Chavez (1), Gerardo F. Perez (1), Luz C. Gomez (1)
(1)Benemerita Universidad Autonoma de Puebla (Mexico), (2)Universidad Politecnica de Tulancingo (Mexico) The presense of saturable absorption (SA) in zinc nanoparticles photodeposited onto the core of an optical fiber by a coherent source is reported. An analysis based on Mie theory was carried out to demonstrate the interaction of the absorption coefficient with the particles sizes in the proximity of surface plasmon resonance in the infrared region. This work opens a new scheme for the implementation of photonic devices.
Highly confined elastic energy in pinned plates through pillar-based defects
Younes Achaoui, Andre Diatta, Stefan Enoch, Sebastien Guenneau
Institut Fresnel (France) We investigate the propagation of elastic bending waves in pinned platonic plates. We first recall and summarize the most conclusive results in the literature, especially regarding the analytical and numerical aspects. We explain afterwards in detail through the calculation of the band diagram, transmission loss and group delay how to perform highly confined long flexural waves within sub-wavelength interspacing between nails (screws). Long-waves frequency demultiplexing is highlighted as a potential application.
Modelling photonic crystals by high-frequency homogenization of Maxwell's equations
Ben Maling, Daniel Colquitt, Richard Craster
Imperial College London (United Kingdom) We present an asymptotic method for studying the behaviour of electromagnetic waves in 3D periodic structures. The efficacy of the method is demonstrated via comparison with full numerical simulations, providing insight into effects associated with both propagating and evanescent modes. We specialise to the case of photonic crystal fibers, for which our method gives quantitative predictions about the nature of the decaying field outside the fiber core.
Design of Nanowire Based Selective Absorber and Emitter for Solar Thermophotovoltaic Applications by Exciting Magnetic Polariton
Jui-Yung Chang, Hao Wang, Liping Wang
Arizona State University (USA) Selective solar absorber and thermal emitter are highly desired for improving the performance of solar thermophotovoltaic (STPV) systems. In this work, nanowire arrays made of different materials exhibiting either selective broadband absorption or narrowband thermal emission are numerically designed with finite-difference time-domain method. The spectral selectivity results from the excitation of magnetic polariton. Particle swarm optimization algorism is implemented for obtaining optimal geometric parameters of selective solar absorber and thermal emitter by maximizing conversion efficiency of the STPV system.
Metamaterials for Wireless Generation of Microplasma Array
Pramod Singh (1), Saroj Rout (1), Jeffrey Hopwood (2), Sameer Sonkusale (1)
(1)Tufts University (USA), (2)Department of Electrical and Computer Engineering-Tufts University (USA) Here, we present a novel-application of metamaterials for remote generation of plasma, the fourth state of matter. One of the most interesting property of the metamaterials, the sub-wavelength localization of incident electromagnetic wave energy, is employed for the generation of high electric field to ignite and sustain microwave plasmas. The two-dimensional array of microplasma is generated using metamaterials. Frequency selective generation of microplasma in a large array is made possible by employing metamaterial units each with different resonance frequencies.
Probing electric field in an enclosed field mapper for characterizing metamaterials
Sucheng Li, Chendong Gu, Yadong Xu, Shahzad Anwar, Weixin Lu, Zhi Hong Hang, Bo Hou, Huanyang Chen
Soochow University (China) Spatially mapping electromagnetic fields in the quasi-two-dimensional field mapper for charactering metamaterial devices, especially those integrating the metal boundary, may encounter troubles including electromagnetic leakage and energy guiding along finitely high metal walls. To eradicate them, a moving contact approach is proposed. The physical air gap between the mobile metal walls and the stationary upper plate of the mapper is closed. We demonstrate the method of closing the gap by mapping the E-field distribution in a rectangular waveguide.
Design and Analysis of Reconfigurable Antenna Using Negative Index Metamaterial
Md Ikbal Hossain, M. R. I. Faruque, M. T. Islam
Universiti Kebangsaan Malaysia (Malaysia) In this paper, a negative index metamaterial structure integrated with microstrip patch antenna is proposed. The antenna microstrip-fed line and ground plane are modified with the proposed metamaterial to obtain reconfigurable characteristics. The finite integration technique (FIT) of computer simulation technology (CST) microwave studio is used throughout the investigation. An anechoic chamber is used for the measurement purpose. The results indicate that the proposed metamaterial structure successfully can be used to make wideband to narrowband and vice versa.
Thermal reshaping of metallic nanostructures far below melting point, and its implications for plasmonic based meta-materials
Adam B. Taylor, James Chon
Swinburne University (Australia) Plasmonic meta-materials rely on exact nanostructure geometries for the production of many extraordinary optical effects. Here, we systematically study how the process of thermally driven surface diffusion can disturb and reshape the geometries of these structures, and that it can occur at temperatures 1000 K below the melting point of gold. Using a combination of in situ TEM heating observations and simulation techniques, we find that thermal stability decreases with increasing feature sharpness, impacting many proposed meta-material structures.
Light Localization in the Presence of Non-Hermitian Defects
Ali Basiri (1), Milan Koirala (2), Alexey Yamilov (2), Yaron Bromberg (3), Hui Cao (3), Tsampikos Kottos (1)
(1)Wesleyan University (USA), (2)Missouri University of Science and Technology (USA), (3)Yale University (USA) We have shown the appearance of Critical States Embedded in the Continuum(CSC) in an array of waveguides with one non-Hermitian defect. When the number of non-Hermitian impurities increases, the Floquet-Bloch (FB) modes of the system possess a localization feature which is distinct from the one found in the standard Anderson model.
Extending resonant wavelengths of contour bowtie nano-antennas with fixed footprint size
Hui-Hsin Hsiao, Shian-Min Chiou, Yu-Ping Chang, Hung-chun Chang
National Taiwan University (Taiwan) A series of bowtie antennas are designed for the purpose of extending the resonant wavelength in the near- and mid-infrared regime under the same antenna footprint size. The solid bowtie antenna is first modified to be a contour antenna and then changed into different contour shapes with extensive resonant paths to redshift the resonances while maintaining the gap enhancement factors at least comparable with that of the solid bowtie antenna.
Fabrication of asymmetric planar terahertz metamaterials with Fano resonances based on double split ring resonators
Shengyan Yang, Xiaoxiang Xia, Zhe Liu, Junjie Li, Changzhi Gu
Chinese Academy of Sciences (China) Ultrafine asymmetric planar terahertz metamaterial (MM) with Fano resonance consisted of double split ring resonators (DSRRs) were studied. They were fabricated by utilizing high-resolution electron-beam lithography method on intrinsic Si substrates. They show large potentials in biomaterial sensing, switching and surface enhanced Raman scattering. What's more, such research will be important in gaining a better understanding of interactions between nearest neighbor SRRs, and will in turn, facilitate the design of novel THz MM devices.
3D isotropic metamaterial design using smart transformation optics
Dongheok Shin (1), Ilsung Seo (1), Kyoungsik Kim (2)
(1)Yonsei University (Korea), (2)Agency for Defense Development (Korea) We introduce new design method for 3D isotropic transformation optics device using smart transformation optics. In 2 dimension smart transformation optics, elastic deformation satisfied quasi-conformal transformation with negative Poisson's ratio -1. We extended smart transformation optics to 3 dimension and demonstrated 3D isotropic metamaterials waveguide. This 3D waveguide is arbitrary bendable and maintain phase in wave propagation.
Optical properties of a 1D and 2D photonic crystals based on sulvanite compounds Cu3TMS4 (TM = V, Nb, Ta)
Luz Gonzalez Reyes, N. Porras-Montenegro
Universidad del Valle Cali-Colombia (Colombia) In this work for the first time we present a theoretical study of the optical properties of 1D and 2D photonic crystals based on sulvanite compounds Cu 3 TMS 4 (TM = V, Nb, Ta). Using the transfer matrix technique, we investigate the photonic band structure, the transmission, reflection and absorption coefficients under the effects of various structural paremeters. Also, we study 2D photonic crystals using the FDTD method. In both cases, we use Drude model considering dissipation effects.
Scattering of electromagnetic pulses on metallic nanospheres with account for plasmonic interference effects
Valery Astapenko, Sergey Svita
Moscow Institute of Physics and Technology (Russia) In the work the radiation scattering by metal nanospheres in a dielectric matrix is studied theoretically for long and short pulses. Spectral-angular scattering efficiency and total probability are calculated and analyzed for different parameters of the problem. It is shown that plasmonic interference effects play important role in pulse scattering on metallic nanospheres in matrix with high value of dielectric permittivity
Optimized scalable circular gratings for efficient photon collection from Nitrogen Vacancy centers in bulk diamond
Jiabao Zheng (1), Andreas Christou Liapis (2), Dirk Robert Englund (1)
(1)Massachusetts Institute of Technology (USA), (2)Brookhaven National Laboratory (USA) Optical defects in diamond have attracted great attention for quantum information processing and sensing applications, but their performance is currently limited by low optical collection efficiency. We propose an optimized dielectric circular grating structure which simultaneously provides Purcell enhancement and improves extraction efficiency into low NA optics. The structures are fabricated using transferred hard mask lithography. These optimized gratings are a promising platform for defect integrated optical devices with highly efficient out-coupling.
Aperture SNOM Studies of Light Emitting Semiconductor Nanostructures
Artyom Shelaev (1), Alexander Ankudinov (2), Alexander Mintairov (2), Sergey Slipchenko (2), Pavel Dorozhkin (1)
(1)NT-MDT Co. (Russia), (2)Ioffe Institute (Russia) Aperture SNOM studies of semiconductor laser, quantum dots and quantum microdisks in near-IR spectral region are presented.
Cooperative energy transfer in plasmonic systems
Vitaliy V. Pustovit (1), Augustine M. Urbas (2), Tigran V. Shahbazyan (2)
(1)Jackson State University (USA), (2)Air Force Research Laboratory (USA) We address the role of cooperative effects in energy transfer (ET) from an ensemble of donors to an acceptor near a plasmonic nanostructure. We demonstrate that in cooperative regime ET takes place from plasmonic superradiant and subradiant states rather than from individual donors leading to a significant increase of ET efficiency. The cooperative amplification of ET relies on the large coupling of superradiant states to external fields and on the slow decay rate of subradiant states.
Characterization of Ultra-Wideband Metamaterial Absorbers with Non-Foster Loads
Yifeng Fan, Hao Chi Zhang, Tie Jun Cui
Southeast University (China) Comparing with conventional passive metamaterial (MTM) absorbers, it is shown that active MTM structure loaded with non-Foster circuits (NFCs) may overcome their inherent physical limitations, thus can achieve an ultra-wideband electromagnetic absorber. However, their performance may be restricted by the stability issue due to the active inclusions which needs to be explored. Here, based on the proposed circuit model, a detailed investigation on the design of a stable ultra-wideband active MTM absorber is presented and verified by simulations.
Tailoring active far-infrared application with graphene metasurface
Lin Wang, Xiaoshuang Chen, Wei Lu
Chinese Academy of Sciences (China) In this work, we demonstrate strong electric resonance response in perforated graphene sheet at far-infrared part of electromagnetic spectrum. Unlike the metallic meta-materials relying on the geometrical inductance for magnetic response, the electric resonance in graphene is mainly caused by localized plasmons and thus enabling sub-wavelength confinement of electromagnetic field. The active tunable electric resonance by electrostatic doping on the graphene sheet provides efficient route for compact biosening, far-infrared imaging and detection.
Shrinking the terahertz light into a point
Lin Wang, Xiaoshuang Chen, Wei Lu
Chinese Academy of Sciences (China) This work demonstrates the ultra-subwavelength confinement of terahertz light in grating coupled graphene field effect transistors by employing a defect in one-dimensional plasmonic crystal. In comparison with metallic metamaterial, graphene plasmon offers the prospective for compact, electrical tunable applications at terahertz band. Due to the larger intrinsic inductance of graphene at terahertz frequency, we find strong concentration of electric field in the cavity composed of gates and graphene-channel.
Tunable plasmonic properties of rounded object-arrays achievable via interferometric illumination of colloid sphere monolayers
A. Somogy, A. Sipos, G. Szabo, Maria Csete
University of Szeged (Hungary) Interferometric illumination of colloid sphere monolayers by circularly polarized light makes possible complex plasmonic structure generation with six independently tunable geometrical parameters. According to plasmonic spectral engineering principles both the near-field and spectral properties can be controlled via predesigned geometrical parameters, including periodicity, mini-array composition and properties of composing nano-objects. The optimal azimuthal orientation and illumination direction are determined for various complex plasmonic patterns and the nanophotonical phenomena resulting in extrema on their transmission spectra are described.
Nonlocality Induced Topological Transitions in Hyperbolic Metamaterials
Long Chen, Cheng Zhang, Jing Zhou, L. Jay Guo
University of Michigan (USA) Hyperbolic metamaterials (HMMs) based on ultrathin metal-dielectric multilayers have been studied by considering the nonlocal response of electrons in metal. We show that nonlocality will induce topological transitions of the iso-frequency surfaces and intrinsically limit the wavenumber as well as photon local density of states for both type I and type II HMMs.
Manufacturing thermal solar absorber with 2D tandem grating structures for high absorption efficiency
Ju-Hyeon Shin (1), Y. D. Kim (1), H. J. Choi (1), H. Lee (1), S. W. Han (2), B. J. Lee (2)
(1)Korea University (Korea), (2)Korea Advanced Institute of Science and Technology (Korea) This study is about manufacturing technology of thermal solar absorber which consists of meta-structured 2D tandem grating. The 2D tandem grating structure contains metal grid, dielectric and metal film. Due to these complex grating structures, several resonances are occurred such as surface plasmonic resonance and magnetic resonance. As a result, absorption was increased on very wide region of wavelength.