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  • Title: Design of ultra-sensitive biosensor applying surface plasmon resonance to a triangular resonator.
    Author: Oh GY, Lee TK, Kim HS, Kim DG, Choi YW.
    Journal: Opt Express; 2012 Aug 13; 20(17):19067-74. PubMed ID: 23038547.
    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.
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