Abstract

We experimentally demonstrate a frequency modulation locked servo loop, locked to a resonance line of an on-chip microdisk resonator in a silicon nitride platform. By using this approach, we demonstrate real-time monitoring of refractive index variations with a precision approaching 107RIU, using a moderate Q factor of 104. The approach can be applied for intensity independent, dynamic and precise index of refraction monitoring for biosensing applications.

© 2012 Optical Society of America

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