Sensitive metal layer assisted guided mode resonance biosensor with a spectrum inversed response and strong asymmetric resonance field distribution

Sheng Fu Lin, Chih Ming Wang, Ting Jou Ding, Ya Lun Tsai, Tsung Hsun Yang, Wen Yih Chen, Jenq Yang Chang

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

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 376.78nm/RIU in fundamental TM mode resonating at 0.809μm 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.

Original languageEnglish
Pages (from-to)14584-14593
Number of pages10
JournalOptics Express
Volume20
Issue number13
DOIs
StatePublished - 18 Jun 2012

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