Excitation and propagation of surface plasmon polaritons on a non-structured surface with a permittivity gradient

Xi Wang; Yang Deng; Qitong Li; Yijing Huang; Zilun Gong; Kyle B Tom; Jie Yao

doi:10.1038/lsa.2016.179

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Excitation and propagation of surface plasmon polaritons on a non-structured surface with a permittivity gradient

Original Articles

- Excitation and propagation of surface plasmon polaritons on a non-structured surface with a permittivity gradient
- Light: Science & Applications Vol. 5, Issue 4, (2016)
- Affiliations：
  
  1.Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
  2.Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
  3.Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Author bio：
  
  J Yao, Email: yaojie@berkeley.edu
- Funds：
- DOI：10.1038/lsa.2016.179
  CLC：
- Published：2016-12，
  
  Published Online：08 June 2016，
  
  Received：28 February 2016，
  
  Revised：06 June 2016，
  
  Accepted：07 June 2016
- Accepted：
Scan QR Code
Wang, X. et al. Excitation and propagation of surface plasmon polaritons on a non-structured surface with a permittivity gradient. Light: Science & Applications, 5, e16179 (2016).
DOI：

Wang, X. et al. Excitation and propagation of surface plasmon polaritons on a non-structured surface with a permittivity gradient. Light: Science & Applications, 5, e16179 (2016). DOI： 10.1038/lsa.2016.179.

摘要

Abstract

Accompanied by the rise of plasmonic materials beyond those based on noble metals and the development of advanced materials processing techniques

it is important to understand the plasmonic behavior of materials with large-scale inhomogeneity (such as gradient permittivity materials) because they cannot be modeled simply as scatterers. In this paper

we theoretically analyze the excitation and propagation of surface plasmon polaritons (SPPs) on a planar interface between a homogeneous dielectric and a material with a gradient of negative permittivity. We demonstrate the following: (ⅰ) free-space propagating waves and surface waves can be coupled by a gradient negative-permittivity material and (ⅱ) the coupling can be enhanced if the material permittivity variation is suitably designed. This theory is then verified by numerical simulations. A direct application of this theory

'rainbow trapping'

is also proposed

considering a realistic design based on doped indium antimonide. This theory may lead to various applications

such as ultracompact spectroscopy and dynamically controllable generation of SPPs.

关键词

Keywords

gradient negative permittivitynon-structured surfacerainbow trappingsurface plasmonics

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