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A highly sensitive refractive index sensor based on grating-assisted stripwaveguide directional coupler is proposed. The sensor is designed using twocoupled asymmetric strip waveguides with a top-loaded grating structure in oneof the waveguides. Maximum light couples from one waveguide to the other at theresonance wavelength, and the change in resonance wavelength with the change inrefractive index of the medium in the cover region is a measure of thesensitivity. The proposed sensor would be an on-chip device with a highrefractive index sensitivity of ~ 104 nm/RIU, and negligible temperaturesensitivity (< 1nm/0C). The sensor configuration offers a low propagation loss,thereby enhancing the sensitivity. Variation of the sensitivity with thewaveguide parameters of the proposed sensor have been studied to optimize thedesign.

Design and Simulation of a Highly Sensitive Refractive Index Sensor based on Grating-assisted Strip Waveguide Directional Coupler