Design of ultra-sensitive biosensor applying surface plasmon resonance to a triangular resonator
- 3 August 2012
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 20 (17), 19067-19074
- https://doi.org/10.1364/oe.20.019067
Abstract
We propose an ultra-sensitive integrated photonic sensor structure using an InP-based triangular resonator, in which a surface plasmon resonance (SPR) gold film is applied on a total internal reflection mirror. We have analyzed and optimized the triangular resonator sensor structure with an extremely small SPR mirror sensing area of 3.3 × 0.35 μm2. Due to the large phase shift in the SPR mirror, a significantly enhanced sensitivity of 930 nm/RIU (refractive index unit) and the maximum peak shift of half free spectral range have been obtained at the SPR angle of 24.125° with Au thickness of 33.4 nm for the change of the refractive index Δn = 1x10−3. This value is larger than the previous largest value in micro resonator-type biosensors. Moreover, the proposed triangular resonator sensor can be easily made in a micro structure with optical source integration.This publication has 20 references indexed in Scilit:
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