On-chip measurement of thermo-optic coefficient (TOC) of samples along with
on-chip temperature measurements can be used to compensate for thermal
fluctuation induced noise in refractometry using integrated photonic sensors.
In this article we demonstrate a device design and describe the method to
extract TOCs of liquid samples using resonant wavelength shifts of a silicon
microring resonator. The TOCs of three standard fluids; De-ionized water,
Ethanol and Isopropanol, were determined using our sensor and show a good
agreement with values reported in literature. A mechanism for tracking of
on-chip temperature variations is also included for ensuring accuracy of TOC
measurements. Potential applications of the demonstrated on-chip TOC sensor
include improvements in accuracy of refractive index measurements and
multiparametric analysis of biochemical analytes.
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