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Info. Vol.8 - No.1 (2014.03.20)
Title Sensitivity response to coating material thickness for an optical resonant reflective biosensor based on a guided mode resonance filter
Authors Bong Kyu Kim1, Kyung-Hyun Kim1, Jongcheol Hong1, Wan-Joong Kim1, Hyunsung Ko1, Chul Huh1, Gun Yong Sung2, Won Ick Jang1, Sun Hee Park1 & Soo Jun Park1
Institutions 1Bio-medical IT Convergence Department, ETRI, Yusong-Gu, Daejeon 305-701, Korea
2Department of Materials Science & Engineering, College of Information & Electronic Engineering, Hallym University
Abstract Sensitivity is a very important parameter for biosensor applications. We have numerically and experimentally studied the sensitivity and linewidth responses of optical resonant reflective biosensors to the thickness of high refractive index materials coating the grating layer used to create a guided mode. Zero sensitivity, which may create serious problems in biosensors, is obtained when the coating material has a relatively low refractive index and a thin coating thickness (near the cutoff condition in which a high index layer is no longer capable of acting as a waveguide). The sensitivity and linewidth are greatly influenced by the thickness of the coating material. The thickness also has an optimal state, which is a very important factor for designing highly sensitive optical resonant reflective biosensors using a guided mode resonance filter.
Keyword Biosensor, Optical resonance reflection biosensor, Guided mode reflection filter, Sensitivity, Nanostructure
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