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Thermo-optical tuning of cascaded double micro-ring resonators for dynamic range enhancement

Prasad, Prashanth Raghavendra and Selvaraja, Shankar Kumar and Varma, Manoj M (2016) Thermo-optical tuning of cascaded double micro-ring resonators for dynamic range enhancement. In: Conference on Frontiers in Biological Detection - From Nanosensors to Systems VIII, FEB 14-15, 2016, San Francisco, CA.

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Official URL: http://dx.doi.org/10.1117/12.2211651


We report on a silicon-photonic cascaded microring sensor with thermo-optic tuning for extension of detection range. Cascaded microring resonators have been used to realize refractive index sensors with high sensitivity in the intensity detection mode. In this configuration, one ring is used to probe analyte while the other ring (called filter) is used for spectrum overlap measurement. A significant drawback of this configuration is decreased range of detection. We overcome this problem by thermo-optically tuning the spectrum the filter ring to track the position of maximum overlap, as the spectrum of the probing ring undergoes shift. Using this peak tracking method, we have experimentally demonstrated range enhancement by a factor of 7.8, compared to the intensity detection scheme. This method can use a broadband source for operation, and has a potential for development of low cost, point of care biomedical applications.

Item Type: Conference Proceedings
Series.: Proceedings of SPIE
Additional Information: Copy right for this article belongs to the SPIE-INT SOC OPTICAL ENGINEERING, 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 28 Oct 2016 07:28
Last Modified: 28 Oct 2016 07:28
URI: http://eprints.iisc.ac.in/id/eprint/55177

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