Avoided resonance crossing and nonreciprocal nearly perfect absorption in plasmonic nanodisks with near-field and farfield couplings

Shih-hui Chang, Chia Yi Sun

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7 Citations (Scopus)

Abstract

Avoided resonance crossings (ARC) in plasmonic nanodisk structures due to near field or far field couplings were numerically demonstrated. Near field coupling in disk dimmer with both vertical or side-by-side arrangement leads to both energy and linewidth anti-crossing by varying one disk size across the other. Far field coupling in double layered disk arrays of extremely small gap size or gap size with Fabry Perot resonant condition close to the frequency selective surface (FSS) stopband center leads to non-reciprocal absorption spectrum as one disk size varying across the other. We observe linewidth anti-crossing but energy crossing of the absorption peak from different side illumination by varying either the size of one disk array or the gap in hetero disk arrays. The disappearing of Fabry-Perot resonant mode from one side illumination and the appearing of nonreciprocal nearly perfect absorption from the other side illumination are well explained by a FSS-Fabry-Perot model.

Original languageEnglish
Pages (from-to)16822-16834
Number of pages13
JournalOptics Express
Volume24
Issue number15
DOIs
Publication statusPublished - 2016 Jul 25

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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