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High precision measurement of intensity peak shifts in tunable cascaded microring intensity sensors

Prasad, Prashanth R and Selvaraja, Shankar K and Varma, Manoj M (2016) High precision measurement of intensity peak shifts in tunable cascaded microring intensity sensors. In: OPTICS LETTERS, 41 (14). pp. 3153-3156.

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Official URL: http://dx.doi.org/10.1364/OL.41.003153


We demonstrate a method to precisely track intensity peak shifts in tunable cascaded double-microring based refractive index sensors. Without modifications, width of the intensity peak of a tunable cascaded microring device limits the precision of peak-shift measurements and thereby the limit of detection of the sensor. We overcome this limitation by using dual harmonic lock-in detection for precisely determining the position of the intensity maximum. Using this modification, we have demonstrated a reduction in the full width at half-maximum (FWHM) of the intensity peak by a factor of over 1300. We show that such a reduction in FWHM of the peak curve can significantly improve the detection limit of a tunable cascaded microring-based sensor. (C) 2016 Optical Society of America

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the OPTICAL SOC AMER, 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 24 Aug 2016 09:52
Last Modified: 24 Aug 2016 09:52
URI: http://eprints.iisc.ac.in/id/eprint/54393

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