title: Design of ultra-sensitive biosensor applying surface plasmon resonance to a triangular resonator.
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.
authors.affiliation: School of Electrical and Electronics Engineering, Chung-Ang University, Seoul, Korea.
authors.forename: Geum-Yoon
authors.initials: GY
authors.lastname: Oh
authors.forename: Tae-Kyeong
authors.initials: TK
authors.lastname: Lee
authors.forename: Hong-Seung
authors.initials: HS
authors.lastname: Kim
authors.forename: Doo Gun
authors.initials: DG
authors.lastname: Kim
authors.forename: Young-Wan
authors.initials: YW
authors.lastname: Choi
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D020349:Surface Plasmon Resonance / Q000295:instrumentation*