Abstract

A thermo-optic phase shifter is proposed and demonstrated by utilizing the high-$Q$ resonance in high-index-contrast grating (HCG). The $Q$-factor up to $\sim 12000$ is measured in a footprint of $110\mathrm{\mu m}\times 300\mathrm{\mu m}$. By heating the HCG with paired metal strip micro-heaters, the optical resonance shifts, which induces phase modulation. A phase shift of $\sim 1.2\pi$ under heating power of $\sim 32\mathrm{mW}$ is directly observed and demodulated from the fringes shifting in a Michelson interferometer. The proposed configuration can also be extended to realize high-speed phase shift by adopting electro-optical modulation.

© 2018 Optical Society of America

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