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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 7, Iss. 3 — Feb. 29, 2012

Thermal independent Silicon-Nitride slot waveguide biosensor with high sensitivity

Xiaoguang Tu, Junfeng Song, Tsung-Yang Liow, Mi Kyoung Park, Jessie Quah Yiying, Jack Sheng Kee, Mingbin Yu, and Guo-Qiang Lo  »View Author Affiliations


Optics Express, Vol. 20, Issue 3, pp. 2640-2648 (2012)
http://dx.doi.org/10.1364/OE.20.002640


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Abstract

As the sensitivity and detection limit of photonic refractive index (RI) biosensor increases, the temperature dependence becomes a major challenge. In this paper, we present a Mach-Zehnder Interferometer (MZI) biosensor based on silicon nitride slot waveguides. The biosensor is designed for minimal temperature dependence without compromising the performance in terms of sensitivity and detection limit. With air cladding, the measured surface sensitivity and detection limit of MZI biosensor reach 7.16 nm/ (ngmm−2) and 1.30 (pgmm−2), while achieving a low temperature dependence is 5.0 pm/o C. With water cladding, the measured bulk sensitivity and detection limit reach 1730(2π)/RIU and 1.29 × 10−5 RIU respectively. By utilizing Vernier effect through cascaded MZI structures, the measured sensitivity enhancement factor is 8.38, which results in a surface detection limit of 0.155 (pgmm−2).

© 2012 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(130.6010) Integrated optics : Sensors
(230.3990) Optical devices : Micro-optical devices
(230.7370) Optical devices : Waveguides

ToC Category:
Sensors

History
Original Manuscript: October 25, 2011
Revised Manuscript: December 8, 2011
Manuscript Accepted: December 13, 2011
Published: January 20, 2012

Virtual Issues
Vol. 7, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Xiaoguang Tu, Junfeng Song, Tsung-Yang Liow, Mi Kyoung Park, Jessie Quah Yiying, Jack Sheng Kee, Mingbin Yu, and Guo-Qiang Lo, "Thermal independent Silicon-Nitride slot waveguide biosensor with high sensitivity," Opt. Express 20, 2640-2648 (2012)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-20-3-2640


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