Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Session B32: Focus Session: Optical Properties of Nanostructures and Metamaterials II |
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Sponsoring Units: DMP Chair: Tom Driscoll, University of California, San Diego Room: C144 |
Monday, March 21, 2011 11:15AM - 11:27AM |
B32.00001: ABSTRACT WITHDRAWN |
Monday, March 21, 2011 11:27AM - 11:39AM |
B32.00002: Optical Properties of Metal-Dielectric-Metal (MDM) Nanoantennas Bhuwan Joshi, Xuejin Wen, Kai Sun, Wu Lu, Qi-Huo Wei We present a new design of plasmonic nanoantennas and study their optical properties. The nanoantennas consist of two metal blocks (cuboids or cylinders) stacked vertically with a dielectric spacer. The results from numerical simulations show that such plasmonic nanoantennas exhibit various cavity resonance modes which produce sharp peaks in the near field spectra and leave dips in the far field scattering spectra. Nanofabrication and characterization of these nanoantennas will also be presented in the talk. [Preview Abstract] |
Monday, March 21, 2011 11:39AM - 11:51AM |
B32.00003: Designing broadband plasmonic nanoantennas for ultrasensing Zhenhuan Yi, Kai Wang, Dmitri V. Voronine, Andrew Traverso, Alexei Sokolov Various designs of broadband plasmonic nanoantennas made of gold and silver nanospheres are considered and optimized for ultrasensitive spectroscopic applications. The simulated nanostructures show a broadband optical response which may be tuned by varying the size, position and composition of nanospheres. Near-field enhancement in nanoantenna hot spots is analyzed and compared with previous literature results in the case of a fractal plasmonic nanolens. Broadband plasmonic nanoantennas may allow detecting ultrasmall concentrations of toxic materials and may be used for decoding DNA and for ultrafast nanophotonics applications. [Preview Abstract] |
Monday, March 21, 2011 11:51AM - 12:27PM |
B32.00004: Optical nanoantennas: controlled emission of single photon sources Invited Speaker: Nanoscale quantum emitters are key elements in quantum optics and sensing. However, efficient optical excitation and detection of such emitters involves large solid angles, due to their omnidirectional interaction with freely propagating light and due to limits of diffraction. Optical nanoantennas offer both nanoscale localization and efficient interaction. Here we focus on the control of the interaction of single photon emitters (molecules, quantum dots) with radiation through metal nanorod antennas. First a novel analytical model is presented, which shows the continuous evolution of the properties of optical antennas as they become increasingly bound, i.e. plasmonic. The model accurately describes the complete emission process, the radiative decay rate, quantum efficiency, and angular emission, moreover gives a quantitative description of the gradual emergence of sub-radiant, super-radiant, and dark modes. Next we investigate experimentally the coupling of a single quantum dot to a nanorod of increasing length. The angular luminescence of the quantum dot is detected through increasingly higher order antenna modes. Simultaneously the emission is strongly polarized and enhanced. Direct confrontation with theory allows to determine the coupling efficiency of the quantum dot to the antenna. Finally, we present unidirectional emission of a single emitter by coupling to a nanofabricated Yagi-Uda antenna. A quantum dot is placed in the near field of the antenna so that it drives the resonant feed element of the antenna. The resulting quantum-dot luminescence is strongly polarized and highly directed into a narrow forward angular cone. The directionality of the quantum dot can be controlled by tuning the antenna dimensions. Thus our results show the potential of optical antennas to communicate energy to, from, and between nano-emitters. \\[4pt] A.G.Curto et al., Science 329, 930 (2010) [Preview Abstract] |
Monday, March 21, 2011 12:27PM - 12:39PM |
B32.00005: Plasmon-mediated polarization-tuneable enhancement of optical absorption in a polymer film Edward J. Osley, Paul G. Thompson, Claudiu G. Biris, Nicolae C. Panoiu, Paul A. Warburton We have fabricated and characterized arrays of nanoscale apertures displaying polarization-tuneable localized surface plasmon (LSP) resonances in the infrared. Arrays of asymmetric cruciform apertures were milled in a gold film using a focused ion beam and subsequently coated with Poly(methyl methacrylate) (PMMA). The aperture geometry is designed so that for a certain polarization state of the incident wave the LSP resonance occurs at the same wavelength as the C=O bond absorption peak in PMMA. The nanostructured film results in an order of magnitude increase in the absorption in PMMA by comparison with a continuous film. By changing the in-plane electric-field polarization of the incident light the LSP resonance shifts away from the PMMA absorption peak, allowing us to quantify the role of plasmonic field-focussing on infrared optical absorption in the polymer film. Numerical simulations show that the increased optical absorption is due to the field enhancement both inside the apertures as well as in their close proximity. We will discuss how this technique may be applied to studies of plasmon-mediated field focussing in other materials including photovoltaic materials. [Preview Abstract] |
Monday, March 21, 2011 12:39PM - 12:51PM |
B32.00006: Plasmonic-molecular resonance coupling Jianfang Wang Localized plamsons have been widely used to enhance optical signals. The plasmon enhancement requires optically active species to be close to the metal surface. The presence of active species can affect the plasmon resonances. Understanding the plasmon-molecule interactions is of importance for both enhancing optical signals and developing plasmon shift-based sensors. We have studied the resonance coupling between Au nanocrystals (NCs) and dyes. The coupling strength can be tuned by varying NC plasmon wavelength. The maximum plasmon shift reaches above 120 nm, which is about 10 times larger than that caused by the local index increase. The plasmon shift decays rapidly as the dye-NC spacing is increased. In addition, the coupling strength is strongly dependent on the molecular properties but independent on the NC shape and size. We have further measured the resonance coupling on single Au NCs. The resonance coupling reveals a unique three-band structure. These single-particle studies will greatly help in understanding the fundamental aspects of the resonance hybridization and designing various plasmon-enhanced spectroscopies. [Preview Abstract] |
Monday, March 21, 2011 12:51PM - 1:03PM |
B32.00007: ABSTRACT WITHDRAWN |
Monday, March 21, 2011 1:03PM - 1:39PM |
B32.00008: Advanced Material Models for Nano-Plasmonic Systems via Discontinuous Galerkin Methods Invited Speaker: Nano-Plasmonic systems offer a tremendous potential for the controlled delivery and extraction of electromagnetic energy to and from tiny objects such as molecules and quantum dots in their immediate vicinity. In view of the increasing sophistication of fabrication and spectroscopic characterization, quantitative computational approaches face challenges that go well beyond the usual description of metals as linear dispersive materials. These challenges include the development of material models that describe the (potentially) strongly nonlocal and nonlinear optical response of such metallic nano-structures themselves as well as the strongly modified light-matter interaction that is mediated by them. This talk reports on the progress of applying the Discontinuous-Galerkin Time-Domain (DGTD) method to the quantitative analysis of nano-plasmonic systems using advanced material models. This includes the efficient modeling of complex geometric features via curvilinear elements, the improvement of the time-stepping scheme via tailored low-storage Runge-Kutta schemes, and the incorporation of optically anisotropic media. In addition, this talk reports on recent results regarding the development and application of advanced material models that are based on a hydrodynamic description of the metal's conduction electrons. By coupling the Maxwell equations to this treatment of the free electrons as a plasma in a confined geometry one is able to capture nonlocal and nonlinear effects and to analyze their consequences. [Preview Abstract] |
Monday, March 21, 2011 1:39PM - 1:51PM |
B32.00009: Suppression of Landau Damping in Metal Nanostructures via Quantum Size Effect Xiaoguang Li, Di Xiao, Zhenyu Zhang Using the matrix random phase approximation, we study the tunability of localized surface plasmon resonance in small metal nanostructures, where the Landau damping is the dominant dissipation channel and the intrinsic limit to plasmonics technique. We find that the linewidth of plasmon can be effectively suppressed due to the quantization of electron-hole pair energy in various highly confined geometries, where the strength of Landau damping oscillates as the scale of system. Moreover, beyond a classical surface scattering picture, the oscillatory effect can be illustrated with an electron-hole pair description, which can be used to understand many other properties of plasmon. Our results show the possibility to control the Landau damping and therefore should be able to stimulate more efforts on future plasmonics of small nanostructures. [Preview Abstract] |
Monday, March 21, 2011 1:51PM - 2:03PM |
B32.00010: Excitation of electromagnetic modes in spheres Raul Garc\'Ia-Llamas, Luis Ramirez-Rodriguez A study of the excitation of whispering gallery modes (WGM) in non-dispersive dielectric micro sphere is presented. The Near-Field intensity behavior of the nano-jets, sub-wavelength volume regions, is presented as a function of the radii of the sphere in resonant and off-resonant conditions. A similar study is presented for nano metallic sphere. [Preview Abstract] |
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