Plasmonic Perfect Absorber for Refractive Index Sensing and SERS
作者： P. Mandal
DOI: 10.1007/S11468-015-0038-8
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摘要: A plasmonic perfect absorber is modeled, and its absorption/reflection properties are investigated in the visible frequency regime using finite-difference time-domain numerical simulation to show how refractive index can be measured accurately dual interrogation technique (wavelength intensity interrogations). Very high absorption (>95 %) observed spectral range below 625 nm. The reflection spectra a crossover (at 50 %) which red shifts depend upon of surrounding medium existing on top structured surface. An equivalent 530 nm shift point per unit (RIU) calculated, clear indication that structure suitable for sensing application. polarization insensitive (∼90 %) 550 nm over wide angle incidence. proposed good surface-enhanced Raman scattering (SERS) due near-field caused by absorption.
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