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Optical sensing of biomolecules using microring resonators

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14 Author(s)

A biosensor application of vertically coupled glass microring resonators with Q∼12 000 is introduced. Using balanced photodetection, very high signal to noise ratios, and thus high sensitivity to refractive index changes (limit of detection of 1.8×10-5 refractive index units), are achieved. Ellipsometry and X-ray photoelectron spectroscopy results indicate successful modification of biosensor surfaces. Experimental data obtained separately for a bulk change of refractive index of the medium and for avidin-biotin binding on the ring surface are reported. Excellent repeatability and close-to-complete surface regeneration after binding are experimentally demonstrated.

Published in:

Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:12 ,  Issue: 1 )

Date of Publication:

Jan.-Feb. 2006

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