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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 17 — Aug. 13, 2012
  • pp: 19067–19074

Design of ultra-sensitive biosensor applying surface plasmon resonance to a triangular resonator

Geum-Yoon Oh, Tae-Kyeong Lee, Hong-Seung Kim, Doo Gun Kim, and Young-Wan Choi  »View Author Affiliations

Optics Express, Vol. 20, Issue 17, pp. 19067-19074 (2012)

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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.

© 2012 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.5750) Optical devices : Resonators
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:

Original Manuscript: July 3, 2012
Revised Manuscript: July 30, 2012
Manuscript Accepted: July 30, 2012
Published: August 3, 2012

Virtual Issues
Vol. 7, Iss. 10 Virtual Journal for Biomedical Optics

Geum-Yoon Oh, Tae-Kyeong Lee, Hong-Seung Kim, Doo Gun Kim, and Young-Wan Choi, "Design of ultra-sensitive biosensor applying surface plasmon resonance to a triangular resonator," Opt. Express 20, 19067-19074 (2012)

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