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.

中文翻译：

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利用高折射率对比光栅中的高Q共振演示热光移相器

提出了一种热光移相器，并利用高相移技术进行了演示。$问$高折射率对比光栅（HCG）中的共振。这$问$高达 $〜12000$ 在占位面积中测量 $110\mathrm{微米}\times 300\mathrm{微米}$。通过用成对的金属条微加热器加热HCG，光学共振发生位移，从而引起相位调制。相移$〜1.2\pi$ 在...的加热功率下 $〜32\mathrm{兆瓦}$直接从迈克尔逊干涉仪中的条纹位移观察和解调。所提出的配置还可以扩展为通过采用电光调制来实现高速相移。