Exciting multiple plasmonic resonances by a double-layered metallic nanostructure

Yanxia Cui, Kin Hung Fung, Jun Xu, Jin Yi, Sailing He, Nicholas X. Fang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)

Abstract

By placing a metallic layer of a periodic nanostrip array above a metallic layer of a periodic nanogroove array with a separation of 120nm, we obtain a triple-band thin film absorber with all its resonant wavelengths displaying absorptivity greater than 90%. Through a systematic study of the current compound structure, we find these three absorption peaks mainly depend on some simple resonances, i.e., the modes supported by the nanostrip array in the top layer, the nanogroove array in the bottom layer, and the horizontal cavity between the two layers. In addition, we show that this kind of absorber is quite robust and fairly insusceptible to the parallel shift between the two different layers. This study should contribute to the design of thin film absorbers/emitters.
Original languageEnglish
Pages (from-to)2827-2832
Number of pages6
JournalJournal of the Optical Society of America B: Optical Physics
Volume28
Issue number11
DOIs
Publication statusPublished - 1 Jan 2011
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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