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Chinese Optics Letters

Chinese Optics Letters

| PUBLISHED MONTHLY BY CHINESE LASER PRESS AND DISTRIBUTED BY OSA

  • Vol. 7, Iss. 7 — Jul. 1, 2009
  • pp: 598–600

Sensitivity and detection limit of dual-waveguide coupled microring resonator biosensors

Zhixuan Xia, Huaxiang Yi, Yao Chen, and Zhiping Zhou  »View Author Affiliations


Chinese Optics Letters, Vol. 7, Issue 7, pp. 598-600 (2009)


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Abstract

We show that a linear relation exists between the device sensitivity and the quality (Q) factor of a dual-waveguide coupled microring resonator optical biosensor when the optimal conditions are satisfied. We also show that the detection limit depends on the loss coefficient and signal-to-nosie ratio (SNR) of the overall system, rather than the circumference of the ring. For a microring resonator sensor whose Q factor is 20000, the detection limit is found to be about 10^{-7} with 30-dB SNR, which is in good agreement with reported experimental data. These results indicate that loss reduction is the top priority in the design and fabrication of highly sensitive microring resonator optical biosensors.

© 2009 Chinese Optics Letters

OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(280.4788) Remote sensing and sensors : Optical sensing and sensors

Citation
Zhixuan Xia, Huaxiang Yi, Yao Chen, and Zhiping Zhou, "Sensitivity and detection limit of dual-waveguide coupled microring resonator biosensors," Chin. Opt. Lett. 7, 598-600 (2009)
http://www.opticsinfobase.org/col/abstract.cfm?URI=col-7-7-598

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