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

TitleHigh precision measurement of intensity peak shifts in tunable cascaded microring intensity sensors
Publication TypeJournal Article
Year of Publication2016
AuthorsPrasad, PR, Selvaraja, SK, Varma, MM
JournalOptics letters
Volume41
Pagination3153–3156
Abstract

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

DOI10.1364/OL.41.003153