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Sensitive metal layer assisted guided mode resonance biosensor with a spectrum inversed response and strong asymmetric resonance field distribution
Author(s) -
Sheng Fu Lin,
Chih–Ming Wang,
Tao Ding,
Ya Lun Tsai,
Tsung Hsun Yang,
Wen Yih Chen,
Jenq Yang Chang
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.014584
Subject(s) - resonance (particle physics) , optics , materials science , sensitivity (control systems) , guided mode resonance , diffraction , surface plasmon resonance , reflection (computer programming) , optoelectronics , diffraction grating , physics , nanotechnology , nanoparticle , atomic physics , electronic engineering , computer science , engineering , programming language
In this paper, a metal layer assisted guide mode resonance (MaGMR) device with high sensitivity is proposed for bioanalytical applications and its functioning is experimentally proved. We find that the reflection spectra present a unique inversed response. The resonance mechanism is also discussed. Numerical calculation results indicate that the high sensitivity performance of MaGMR comes from the strongly asymmetric resonance modal profile and low propagation angle inside the waveguide. There is a one-fold enhancement of the evanescent wave in the analytes region compared to typical GMR. According to the experimental results, the proposed MaGMR achieved a bulk sensitivity of 376.78 nm/RIU in fundamental TM mode resonating at 0.809 μm with the first diffraction angle. Experiment results show a 264.78% enhancement in the sensitivity compared to that of the typical GMR sensor in the same resonance conditions of TM mode.

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