Poster session III
GaN Nanorod Cavities as a Fluorescence-Sensing Platform
Nikolai Hueting (1), Philip Shields (2), Duncan Allsopp (2), Martin Cryan (1)
(1)University of Bristol (United Kingdom), (2)University of Bath (United Kingdom) GaN photonic crystal nanorod cavities are presented as a central building block of a fluorescence-sensing platform. The cavities are fabricated with nano-imprinting and subsequent high aspect ratio etching. The high electric field strength in the air region allows the placement of fluorescent substances in the high field region. The modified emitter environment leads to enhanced emission via Purcell enhancement.
Terahertz wave emission from plasmonic chiral metasurfaces
Takahiro Matsui (1), Satoshi Tomita (1), Motoki Asai (2), Yuzuru Tadokoro (2), Keisuke Takano (2), Makoto Nakajima (2), Masanori Hangyo (2), Hisao Yanagi (1)
(1)Nara Institute of Science and Technology (Japan), (2)Osaka University (Japan) We fabricated plasmonic chiral metasurfaces with pinwheel-like structures on silver films using a focused ion beam milling technique. In a time-domain spectroscopy, we have succeeded in observing terahertz wave emission from the metasurfaces irradiated by a near-infrared Ti:sapphire ultra-short pulsed laser.
Extremely compact metamaterial absorber based on the meandered electric resonators with low dielectric constant media
Yongjun Huang, Haibin Sun, Xuefeng Zhao, Jian Li, Guangjun Wen
University of Electronic Science and Technology of China (China) We analyze and discuss an extremely compact metamaterial absorber by introducing meandered lines into the electric resonant cells and covering another dielectric layer on it. The size reduction procedures are presented step by step and such extremely compact metamaterial absorber with in-plane (lateral) dimension of lambda/28 and vertical thickness of lambda/37 is obtained. The proposed extremely compact metamaterial absorber shows near-unity absorption under a wide range of incident angles for both TE and TM radiations.
Efficient fiber-optical tweezing of dielectric nanoparticles with coaxial plasmonic apertures
Amr Saleh, Jennifer Dionne
Stanford University (USA) In this work, we propose a novel design for fiber-based plasmonic tweezers. We combine a coaxial plasmonic aperture that has powerful trapping capabilities with a bull's eye structure on a fiber tip. We show that with this design, the power required for optical trapping is reduced by a factor of seven. This design opens the door for low power three dimensional optical trapping of dielectric particles with sizes previously inaccessible with conventional optical tweezers.
Photonic Band Structure of Graphene - Dielectric Superlattices
Alejandro Hernandez-Lopez (1), Martha Palomino (1), Felipe Ramos-Mendieta (2)
(1)Benemerita Universidad Autonoma de Puebla FCFM (Mexico), (2)Universidad de Sonora DIFUS (Mexico) We investigate the photonic band structure of superlattices constituted by alternated graphene and dielectric layers. The bands result from the coupling of the transverse magnetic plasmons supported by the graphene sheets. The dispersion relations are calculated for doped graphene in the THz spectrum. The band structure is compared with reflection spectra calculated using the ATR technique.
High plasmon concentration and electric wave guide in a 2D photonic crystal made of metallic rods embedded in air
Danny Calvo-Velasco, Nelson Porras-Montenegro
Universidad del Valle (Colombia) Using the revised plane wave method (RPWM), we calculated the photonic band structure (PBS) considering TE polarization of a square 2D photonic cristal (PC) made of square metallic rods embedded in air. Comparing different plasma frequencies, we found a characteristic band distribution related with the existence of plasmon-polaritons in the surface of the rods, also we found that this type of rod shape contributes to a high concentration of the electromagnetic field close to the rod corners.
Polarization - Selective Optical Darkness in Metamaterials built from Nano-Bismuth
Johann Toudert, Rosalia Serna
Instituto de Optica (Spain) We extend the concept of polarization - selective optical darkness to metamaterials based on bismuth nanostructures (nano-Bi). It will be shown that in nano-Bi based metamaterials, this phenomenon can be achieved due to the near UV - visible polaritonic resonances permitted by the near IR interband transitions of Bi.
Subwavelength Grating Waveguides for Integrated Photonics
Hamdam Nikkhah, Trevor Hall
University of Ottawa (Canada) Subwavelength grating waveguides (SWG) are locally periodic structures with parameters that may vary slowly on the scale of a wavelength. Here the implementation of a Luneburg lens as a SWG to provide Fourier optics on a chip and the design of the adiabatic structures that must be provided to interface SWG structures to conventional waveguides are considered. Preliminary findings are reported on the dispersion engineering of multimode interference couplers towards the ideal port phase relations needed in coherent applications.
Preparation of Few-layered g-C3N4 Nanosheets Film and Microstructure Research
Hui Miao, Xiaoyun Hu, Hao Wu, Yuanyuan Hao, Qian Sun, Guowei Zhang, Dekai Zhang, Jun Fan, Jintao Bai, Xun Hou
Northwest University (China) In this paper, few-layered g-C3N4 nanosheets film was successfully prepared by liquid exfoliation and vacuum filtrated self-assembled method. The obtained g-C3N4 nanosheets film displayed transparent character and tunable thickness. The blue-shift of the PL spectra of the nanosheets film indicated the energy gap increased, which is the changing process of g-C3N4 from indirect-gap semiconductor to direct-gap semiconductor. The photocurrent test showed the as prepared film had a good photocurrent response nearly 0.19uA to each switch-on and switch-off event.
Sub-wavelength super-oscillation in the single photon regime
Charles Altuzarra (1), Guanghui Yuan (1), Stefano Vezzoli (1), Edward Rogers (2), Christophe Couteau (1), Cesare Soci (1), Zexiang Shen (1), Nikolay I. Zheludev (1)
(1)Centre for Disruptive Photonic Technologies at NTU (Singapore), (2)University of Southampton (United Kingdom) We report on the first experimental demonstration of super-oscillatory behaviours in the single photon regime, where the quantum wave-function of a single photon can be localized into length scale much smaller than the smallest wave length contained in its Fourier spectrum.
Efficient thermal-light and light-thermal conversion by a selective emitter/absorber
Jing Zhou, Xi Chen, L. Jay Guo
University of Michigan (USA) We use a diluted refractory metal as a selective emitter/absorber to enhance the efficiencies of thermal-light and light-thermal conversions. The absorptivity (emissivity) was measured at high temperatures up to 750C.
Discrete solitons in graphene multilayers
Yuliy Bludov (1), Daria Smirnova (2), Yuri Kivshar (2), Nuno Peres (1), Mikhail Vasilevskiy (1)
(1)Universidade do Minho (Portugal), (2)Australian National University (Australia) We study nonlinear properties of multilayer metamaterials created by graphene sheets separated by dielectric layers. We demonstrate that such structures can support localized nonlinear modes described by the discrete nonlinear Schrodinger equation and that its solutions are associated with stable discrete plasmon solitons. We also analyze the nonlinear surface modes in truncated graphene metamaterials being a nonlinear analog of surface Tamm states.
An equivalent realization of coherent perfect absorption under single beam illumination
Sucheng Li, Jie Luo, Shahzad Anwar, Shuo Li, Weixin Lu, Zhi Hong Hang, Yun Lai, Bo Hou, Mingrong Shen, Chin-Hua Wang
Soochow University (China) We have experimentally and numerically demonstrated that the coherent perfect absorption (CPA) can equivalently be accomplished under single beam illumination. Practically, we introduce mushroom structures to the CPA configuration. By covering them with an ultrathin conductive film of sheet resistance 377 Ohms, the perfect microwave absorption is achieved when the film is illuminated under single beam. Our work proposes an equivalent way to realize the CPA under the single beam illumination, and might have applications in engineering absorbent materials.
Enhanced absorption of graphene by exciting magnetic polaritons and surface plasmon polaritons
Bo Zhao (1), Junming Zhao (2), Zhuomin Zhang (1)
(1)Georgia Institute of Technology (USA), (2)Harbin Institute of Technology (China) The minimal absorption of graphene in visible and near-inferred range has severely limited its application. This work demonstrates that the absorptance in a monatomic graphene layer can be greatly enhanced to nearly 80 percent when magnetic polaritons (MPs) or surface plasmon polaritons (SPPs) are excited in deep metal gratings. The plasmon frequency is essentially not affected by the additional graphene layer. Meanwhile, the enhanced graphene absorptance is angular dependent for SPPs but independent for MPs.
Wavefront shaping in cavities: waves trapped in a box with taylored boundaries.
Matthieu Dupre, M. P. Del Hougne, M. Fink, F. Lemoult, G. Lerosey
ESPCI ParisTech (France) Using electronically tunable metasurfaces that modify locally the boundaries of a cavity, switching them from electric to magnetic conductors, we show that we can control eigen modes and frequencies in cavities, allowing wavefrontshaping, transmission enhancement between antennas and eigenfrequencies positionning at will.
Luneburg-fisheye lens featuring dual function at terahertz frequencies
Shuo Liu, Xiang Wan, Tiejun Cui
Southeast University (China) We present a planar Luneburg-fisheye lens capable of realizing both Luneburg and fisheye functions at terahertz frequencies. The deliberately designed anisotropic structure exhibits different effective surface index along the x- and y-directions. By arranging such units with the corresponding geometrical parameters on a quartz substrate, we can realize point source to point source (the fisheye function) or point source to plane wave (the Luneburg function) conversions when a terahertz point source is placed at the x- and y-axes.
Theory of Numerical Pinning Model with Maxwell Stress
Hokkaido University of Science (Japan) The numerical pinning model for high-Tc superconductor (HTS) is explained with Maxwell stress. Stable levitation of a permanent magnet with YBCO tapes is obtained without shielding currents in experiments. Though present experiments are for large scale applications, basic theory comes from pinning of flxsoids in HTS. The pinning force is discussed with the critical currents of the YBCO tape by using the numerical pinning model.
Influence of TeO2 layer on the reversible optical properties Ta2O5/SiO2 one-dimensional photonic crystals
Cheol Jin Park, Heon Kong, Jong Bin Yeo, Hyun Yong Lee
Chonnam National University (Korea) In this work, we have investigated the optical properties of one-dimensional photonic quasi-crystal (1D-PQC) with a defect layer of TeO2-based chalcogenide. First, optical constants of Ta2O5, SiO2 and TeO2 were measured by ellipsometer. The 1D-PQC was designed using the transfer matrix method (TMM). Designed structures were fabricated by rf sputtering system. The deposition rates of the each film measured by scanning electron microscope (SEM). The optical properties of 1D-PQC were evaluated before and after exposing He-Ne and He-Cd laser.
Modeling of a wideband single-feed circularly polarized microstrip antenna for UHF RFID applications
Tao Zhou, Xi-Wang Dai, Mian Pan, Hai-jun Gao, Zhi-Qun Cheng, Ling-Ling Sun
Hangzhou Dianzi University (China) The modeling of a microstrip antenna for RFID application at 2.4 GHz is proposed. It consists of a single probe feed meandered microstrip line and a corner truncated microstrip patch. The CP operation is realized by adjusting the truncated corners, the meandered microstrip line and the thickness of air layer. The wideband impedance bandwidth of the anatenna defined by VSWR less than 2.0 is 470MHz, the axial ratio bandwidth less than 3dB is enhanced to 240MHz.
Polarization Independent Terahertz Metamaterial Absorber and its Electric Circuit Analogous
Mohammad Hokmabadi, Muliang Zhu, Patrick Kung, Seongsin Kim
The University of Alabama (USA) Here, we design a THz metamaterial absorber with a polarization independent response. A model is suggested as its electric circuit analogous. By using a hybrid approach, the effective parameters of the model are uniquely determined. The proposed approach is based on calculation, fitting, and the physical mechanism of the absorption interpreted by the model. This model and the proposed approach is applicable for all metamaterial absorbers with arbitrary frequency selective surfaces (FSS).
Investigation of Robust Flexible Conformal THz Perfect Metamaterial Absorber
Juhyung Kim, Mohammad Hokmabadi, Soner Balci, Elmer Rivera, David Wilbert, Patrick Kung, Seongsin Kim
The University of Alabama (USA) The flexible metamaterials have promised to greatly expand our ability to realize a wide range of novel applications including new methods of sensing and cloaking. We performed a new experiment for the robust flexible THz frequency perfect absorber, which was fabricated as a combination of multilayer polyimides and multilayer frequency selective surfaces, which works for dual-band absorption, on various 3D printed conformed surfaces, thus verified their ability as a thin film absorber in the real world application.
Deposition and characterization of erbium doped alumina coatings by reactive cosputtering
Priyanka Nayar, Yujie Deng, Ming Hui Lu
Nanjing University (China) Thin films of amorphous erbium doped alumina of thickness 400-500 nm were fabricated on thermally oxidized silicon and fused silica substrates using cosputtering technique and the influence of the deposition parameters (substrate temperature, RF power, oxygen pressure) used during the growth on their structural and optical characteristics have been studied. The main aim is to optimize the deposition parameters so as to obtain the best optical performance of the deposited films for applications in optical communication window.
Design and Analysis of A Compact Triple Band-Notched UWB antenna using rectangular Split-Ring Resonators (SRRs)
Amine Hedfi, Mohamed Hayouni, Fethi Choubani
Innov'Com Research Laboratory-Sup'Com (Tunisia) A compact WiMAX, WLAN and downlink of X-band satellite communication systems triple band-notched monopole UWB antenna is proposed. The first and second notched bands are respectively achieved using a quarter wavelength straight open-ended and a semi-elliptic slots etched in the radiating patch while the third notched band is achieved using two rectangular split ring resonators (SRRs) near the feed line-patch junction of the antenna.
Continuous to Periodical Segmented Waveguide Coupling Design
Anderson Dourado Sisnando (1), Vitaly Felix Rodriguez-Esquerre (1), Cosme Eustaqui Rubio Mercedes (2)
(1)Federal University of Bahia (Brazil), (2)State University of Mato Grosso do Sul (Brazil) The coupling efficiency between continuous and periodic segmented waveguides using segmented taper has been successfully and efficiently designed and optimized by using the genetic algorithms (GA) in conjunction with the finite element method (FEM-2D). The coupling efficiency of the optimized structure as a function of the operating wavelength has been also analyzed.
Probing graphene nonlinear dielectric susceptibility tensor using a photon sieve
Michael Lobet (1), Michael Sarrazin (1), Francesca Crechet (1), Nicolas Reckinger (1), Alexandru Vlad (2), Jean-François Colomer (1), Dan Lis (1)
(1)University of Namur (Belgium), (2)UCLouvain (Belgium) An original method to constrain the values of the second-order susceptibility of graphene deposited on a gold substrate is presented, which combines second-harmonic generation experiments with semi-analytical computations to solve the inverse scattering problem. A gold photon sieve is used to trap the light and allow surface plasmons propagation in order to provide an intense effective pump. Three non-degenerate terms of the second-order susceptibility can be constrained for a second harmonic signal at 780 nm.
Analytical model and performances at large scanning angles of an ultra-wideband self-complementary connected array antenna
Stefan Varault (1), Michel Soiron (2), Andre Barka (3), Anne-Claire Lepage (1), Xavier Begaud (1)
(1)ESPCI ParisTech (France), (2)SART (France), (3)ONERA-The French Aerospace Lab (France) We present in this work a comprehensive analytical model of a self-complementary connected array antenna. This circuit model is used to dimension and optimize the structure with a minimum computational burden. The final design involves a meta-surface on top of the radiating aperture, together with a substrate made from an artificial anisotropic dielectric. This multilayer achieves a reflection coefficient |S11|< -10dB over a 5:1 bandwidth ratio for incidences as high as 60 degree in both TE and TM polarizations.
Tunable graphene-coated spiral dielectric lens as a circular polarization analyzer
Bofeng Zhu, Guobin Ren, Martin Cryan, Yixiao Gao, Chenglong Wan, Shuisheng Jian
University of Bristol (United Kingdom) We propose a tunable circular polarization analyzer based on a graphene-coated spiral dielectric lens. The analyzer focuses circular polarization with opposite chirality while defocusing that with same chirality, producing spatially separated solid dot or donut shape fields. The focusing and defocusing effects are independent of the chemical potential of graphene, and depend only on the dielectric permittivity and grating occupation ratio. The operation wavelength of analyzer can be tuned by adjusting the graphene chemical potential without degrading the performance.
Computational Analysis of Gold/Titanium Nitride Core/Shell Nanoparticles for Integration into Heat Assisted Magnetic Recording
James Bennington, Robert Bowman, Paul Dawson
Queen's University Belfast (United Kingdom) We demonstrate computationally the localized surface plasmon resonance (LSPR) of gold/titanium nitride, core/shell nanostructures with varying shell thicknesses and show their similarity compared to pure gold structures of similar size. We suggest that owing to titanium nitrides well documented performance as a diffusion barrier in Ultra Large Scale Integration (ULSI) and the demonstrated plasmonic properties of our core/shell structures that it is a prime candidate as a thermal solution for heat assisted magnetic recording (HAMR) near field transducers (NFTs).
LCR Model for Hyperbolic Metamaterials
Christopher Rosenbury, Daniel Fullager, Michael Fiddy
University of North Carolina at Charlotte (USA) We show that a previously derived LCR model for a plasmonic waveguide can be generalized to a model for hyperbolic metamaterials (HMMs). An analysis of previous work and a generalization into a multilayer structure is presented. A comparison with simulations is provided. The physical significance and practical applications are discussed.
Numerical modal analysis in dispersive and dissipative plasmonic structures.
Yoann Brule, Guillaume Demesy, Boris Gralak
Institut Fresnel (France) Modal analysis is an essential tool since it straightly provides the lighting conditions under which a plasmonic structure can sing. Modes appear as solutions of source free Maxwell's equations. For dispersive and dissipative structures, the associated spectral problem is not standard, being generally non linear in frequency and not selfadjoint. We developed and implemented two finite element formulations to tackle this non standard eigenvalue problem in a 2D multi-domain closed cavity. Their numerical validity are checked against the analytical solution.
Coupling enhancement of metamaterial structures on graphene
Abdullah Gul University (Turkey) Split ring resonators (SRRs) are used in order to localize and enhance incident electromagnetic field. Electrically controllable sheet concentration of graphene provides a platform where the optical conductivity of the graphene layer can be tuned. The spectral response of SRR arrays can be modulated by applying gate voltage. We showed that the tuning range can be increased by designing SRR structures with higher effective mode area.
Bi Directional Surface Plasmon Vortex Creation in a Metasurface under Linearly Polarized Excitation
Chung-Yin Lin, Ching-Fu Chen, Chen-Ta Ku, Chen-Bin Huang
National Tsing Hua University (Taiwan) A nanocavity in a gold thin film is optimized and arranged to form a metasurface. We numerically demonstrate that surface plasmon vortices with directional-tunable orbital angular momenta can be generated under linearly-polarized optical excitation.
Intuitive analysis of modes guided in a subwavelength metallic groove
Tong Zhu, Haitao Liu
Nankai University (China) Metal-insulator-metal waveguide modes can be guided by a subwavelength metallic nanogroove. Here we propose an analytical model for reproducing the dispersion diagram and the field distribution of the guided modes in the nanogroove. With the model, the number of propagative modes for finite-depth grooves and the cut-off frequency can be obtained. The model reveals that the modes guided by the groove can be understood due to an excitation of the fundamental mode.
Step-Phasors and Non-Smooth Light Transmission through a Sub-wavelength Slit
Alexander Ewen Chen (1), Jian-Shiung Hong (2), Kuan-Ren Chen (2)
(1)The Pennsylvania State University (USA), (2)National Cheng Kung University (Taiwan) We present a novel method using step phasors to study the early dynamics of light transmission through a sub-wavelength slit and to describe transmitted electric field components. The resultant transmitted electric field is based on the superposition of the step phasors and can be a non-smooth wave function. Besides academic importance, these findings are of immediate interest towards applications of pulsed nano-photonics.
Controllable surface plasmon polariton excitation by usage of a nanoantenna metasurface
Holger Muhlenbernd (1), Philip Georgi (1), Nitipat Ong Pholchai (2), Lingling Huang (3), Shuang Zhang (4), Thomas Zentgraf (1)
(1)University of Paderborn (Germany), (2)King Mongkut's University (Thailand), (3)Beijing Institute of Technology (China), (4)University of Birmingham (United Kingdom) Surface plasmon polaritons (SPPs) are used for many technical and scientific applications, reaching from integrated optics to bio sensing. For many applications it is necessary to control the amplitude and phase of SPPs. This challenge we solved by using a metal insulator metal metasurface containing nanoantennas. With this structure we can change the phase and the amplitude of the excited SPPs continuously simply by changing the polarization state and angle of the incoming light.
Nanoshells Tuning for Cancer Therapy
Ahmed Abbas, Mostafa El Said, Samir Fahmy Mahmoud
Cairo University (Egypt) Nanoshells have received considerable attention overthe last decade.Nanoshells are spherical nanoparticles consisting of a dielectric core covered by a thin metallic shell which is usually gold.When illuminated by a plane wave at the right frequency, a significant local electric field enhancement occurs near the metal-dielectric interface due to the strong surface plasmon resonance (SPR).
Silicon Nanospheres for Enhancing Light-Matter Interactions at the Nanoscale
Hao Wang, Huanjun Chen
Sun Yat-sen University (China) In our study, by combining the silicon nanosphere with the Au nanosphere, we demonstrated theoretically and experimentally the unidirectional visible light scattering behaviors of Janus dimer structures. Such exotic behavior originates from the hybridization of the electric and magnetic dipole mode in the dimers. We further showed that by coating the silicon nanosphere with a molecular layer, strong coupling effect can be induced between the exciton transition of the molecules and the magnetic dipole resonance in the silicon nanosphere.
Shape Optimization for Enhancement of Second Harmonic Generation by Double Resonance Conditions
Nicholas Wang, Andrew P. Lawson, Patrick C. McAvoy, Isaak D. Mayergoyz, Oded Rabin
University of Maryland College Park (USA) Plasmonic nanostructures may facilitate second harmonic generation(SHG) in non-linear optic media by local enhancement of optical electric fields in their immediate vicinity. We demonstrate computationally that by tailoring the material and shape of the plasmonic nanostructure, localized surface plasmon resonances can be tuned to occur simultaneously at the fundamental and the doubled frequencies. We report on metal nanorods and nanotubes that are optimized for the enhancement of SHG with incident radiation in the infrared and emission in the visible.
Coupling efficiency of light to surface plasmon polariton on a polymer-metal interface at different incidence angles.
Eduardo Pisano, Cesar E. G. Ortiz, Rodolfo Cortes, Victor M. Coello
Centro de Investigacion Cientifica y de Educacion Superior de Ensenada (Mexico) In this work, experimental result of the coupling efficiency of light to surface plasmon polaritons (SPPs) is presented. The SPP modes were excited at a polymer-metal interface. The measurements were made at different incidence excitation angles using a polymer edge nanostructure for SPP launching. The structure is similar to that used in dielectric-loaded surface plasmon polariton waveguides. The analysis of the coupling efficiency dependence might lead to a compensation solution for SPP propagation length losses.
Factors Determining the Light Amplification Spectra in Surface Plasmon-Enhanced Organic Light Emitters
Takahiro Inui (1), Yuta Mizoguchi (1), Takuya Yoneda (1), Hiroto Kawase (1), Kenichi Kasahara (1), Naoki Ikeda (2), Yoshimasa Sugimoto (2)
(1)Ritsumeikan University (Japan), (2)NIMS (Japan) The determinant factors of the photoluminescence enhancement spectra due to surface plasmon scattering with an organic material whose peak emission was distant from the plasma wavelength of a metal were investigated. The surface plasmon scattering cross section was estimated by placing a nanostructure on Ag. Although enhancement decrease occurring at longer wavelengths remains to be investigated, the reason why light amplification didn't occur near the plasma wavelength was explained by a short propagation distance of the surface plasmon.