Abstract
A thermo-optic phase shifter is proposed and demonstrated by utilizing the high- resonance in high-index-contrast grating (HCG). The -factor up to is measured in a footprint of . By heating the HCG with paired metal strip micro-heaters, the optical resonance shifts, which induces phase modulation. A phase shift of under heating power of 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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