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      Beyond the Hybridization Effects in Plasmonic Nanoclusters: Diffraction-Induced Enhanced Absorption and Scattering

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          Abstract

          It is demonstrated herein both theoretically and experimentally that Young's interference can be observed in plasmonic structures when two or three nanoparticles with separation on the order of the wavelength are illuminated simultaneously by a plane wave. This effect leads to the formation of intermediate-field hybridized modes with a character distinct of those mediated by near-field and/or far-field radiative effects. The physical mechanism for the enhancement of absorption and scattering of light due to plasmonic Young's interference is revealed, which we explain through a redistribution of the Poynting vector field and the formation of near-field subwavelength optical vortices.

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          Metamaterials and negative refractive index.

          Recently, artificially constructed metamaterials have become of considerable interest, because these materials can exhibit electromagnetic characteristics unlike those of any conventional materials. Artificial magnetism and negative refractive index are two specific types of behavior that have been demonstrated over the past few years, illustrating the new physics and new applications possible when we expand our view as to what constitutes a material. In this review, we describe recent advances in metamaterials research and discuss the potential that these materials may hold for realizing new and seemingly exotic electromagnetic phenomena.
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            Optical negative-index metamaterials

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              Resonant optical antennas.

              We have fabricated nanometer-scale gold dipole antennas designed to be resonant at optical frequencies. On resonance, strong field enhancement in the antenna feed gap leads to white-light supercontinuum generation. The antenna length at resonance is considerably shorter than one-half the wavelength of the incident light. This is in contradiction to classical antenna theory but in qualitative accordance with computer simulations that take into account the finite metallic conductivity at optical frequencies. Because optical antennas link propagating radiation and confined/enhanced optical fields, they should find applications in optical characterization, manipulation of nanostructures, and optical information processing.
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                Author and article information

                Journal
                Small
                Small
                Wiley
                16136810
                February 2014
                February 2014
                September 03 2013
                : 10
                : 3
                : 576-583
                Affiliations
                [1 ]Data Storage Institute; A*STAR (Agency for Science Technology and Research); DSI Building, 5 Engineering Drive 1 117608 Singapore
                [2 ]Department of Physics; Imperial College London; London SW7 2AZ United Kingdom
                [3 ]Department of Electrical and Computer Engineering; National University of Singapore; 117576 Singapore
                [4 ]Nonlinear Physics Centre, Research School of Physics and Engineering; Australian National University; Canberra ACT 0200 Australia
                [5 ]Department of Applied Physics; The Hong Kong Polytechnic University; Hong Kong China
                [6 ]Faculty of Physics; M. V. Lomonosov Moscow State University, Moscow 119991, Russia; Technical University MIREA; 119454 Moscow Russia
                [7 ]Department of Physics; Imperial College London; London SW7 2AZ UK
                Article
                10.1002/smll.201301419
                24000095
                © 2013

                http://doi.wiley.com/10.1002/tdm_license_1.1

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