Journal
OPTICS LETTERS
Volume 41, Issue 7, Pages 1582-1585Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.41.001582
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Funding
- National Natural Science Foundation of China (NSFC) [61203211]
- Natural Science Foundation of Jiangsu Province [BK20141483]
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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. (C) 2016 Optical Society of America
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