Abstract

We propose an ultracompact parallel label-free biosensor based on concentric silicon-on-insulator microring resonators. Our numerical studies show that the proposed biosensor offers higher sensitivity and a larger detection area than conventional single-ring-based sensors. We analyze the detection sensitivity of the DNA hybridization by immobilizing the probe on top of the double concentric ring resonators and in the ring-ring air gap. For a concentric double-ring system with an area of 27.646 μm², the bulk detection sensitivity is 683 nmRIU⁻¹. The sensitive uniformity of the system related to the optical field distribution is also studied.

© 2009 Optical Society of America

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History
Original Manuscript: February 2, 2009
Manuscript Accepted: July 5, 2009
Revised Manuscript: June 12, 2009
Published: July 21, 2009

References

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Author Affiliations

Ziyang Zhang, Min Qiu

Royal Institute of Technology (KTH)

Xiaohui Li, Shenying Qin, Tao Wang, Fangfei Liu, Yikai Su

Shanghai Jiao Tong University

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