Optical biosensors on silicon platforms have demonstrated their great potential in label-free detection and analysis tool. The major challenge of ring resonator based optical biosensors is their high sensitivity to temperature variations. We have designed a double-ring resonator biosensor using a vertical coupling method. Simulation results show that the double-ring configuration effectively eliminates the temperature and environmental fluctuations by the resonant wavelength shift correction induced from the reference ring. The coupling gap in the vertical coupling method can be tuned by timing the deposition/growth rate of the space layer, without the need of any advanced lithography. The vertical coupling method allows a low fabrication cost.

Date Published: 2 February 2012
PDF: 6 pages
Proc. SPIE 8266, Silicon Photonics VII, 826603 (2 February 2012); doi: 10.1117/12.908902

Published in SPIE Proceedings Vol. 8266:
Silicon Photonics VII
Joel Kubby; Graham Trevor Reed, Editor(s)