Waveguide-coupled surface phonon resonance sensors with super-resolution in the mid-infrared region

A waveguide-coupled surface phonon resonance (SPhR) sensor with super-resolution based on Fano resonance (FR) by using a multilayer system within the Kretschmann configuration in the mid-infrared wavelength region is proposed. Due to the coherent interference of the waveguide and the surface phonon...

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Bibliographic Details
Published inOptics letters Vol. 41; no. 7; p. 1582
Main Authors Zheng, Gaige, Chen, Yunyun, Bu, Lingbing, Xu, Linhua, Su, Wei
Format Journal Article
LanguageEnglish
Published United States 01.04.2016
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Summary:A waveguide-coupled surface phonon resonance (SPhR) sensor with super-resolution based on Fano resonance (FR) by using a multilayer system within the Kretschmann configuration in the mid-infrared wavelength region is proposed. Due to the coherent interference of the waveguide and the surface phonon polariton modes, the calculated reflectivity spectrum possesses sharp asymmetric FR dips. An ultra-small linewidth is formed because of the Fano coupling, and the physical features contribute to a highly efficient nano-sensor for refractive index sensing. The bulk and surface sensitivity by intensities are greatly enhanced relative to those of conventional SPhR sensors.
ISSN:1539-4794
DOI:10.1364/OL.41.001582