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Indexed by:期刊论文

Date of Publication:2018-08-01

Journal:OPTICAL MATERIALS EXPRESS

Included Journals:SCIE

Volume:8

Issue:8

Page Number:2131-2139

ISSN No.:2159-3930

Abstract:In this paper, we design and investigate a binary elliptical nanoring resonator array on a gold conducting layer, which can generate two optical Fano-like resonant modes in the visible light range under normal incidence. The gold conducting layer underneath the nanoring resonator array strongly enhances the coupling and hybridization among different resonant modes. These two distinct Fano-like resonances originate from the interactions of dipolar antibonding and bonding modes, and dipolar bonding and propagating surface plasmon modes, respectively, which provide as high a refractive index sensitivity as 620 n/mRIU, and achieve high figures of merit, 78 and 154, separately in a refractive index range of 1.33 similar to 1.40. Compared to the circular nanoring array, the elliptical structure we demonstrate here can generate shaper resonant modes that can be used for high sensitivity measurement. The designed binary elliptical nanoring resonator array is very promising for dual-channel biosensing application. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement