Demonstration of a thermo-optic phase shifter by utilizing high-Q resonance in high-index-contrast grating

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 ∼12000 is measured in a footprint of 110  μm×300  μm. By heating the HCG with paired metal strip micro-heaters, the optical resonance shifts, which ind...

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Bibliographic Details
Published inOptics letters Vol. 43; no. 4; p. 827
Main Authors Lv, Jiaxin, Yin, Xuefan, Jin, Jicheng, Zhang, Haiyang, Zhao, Che, Peng, Chao, Hu, Weiwei
Format Journal Article
LanguageEnglish
Published United States 15.02.2018
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Summary: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 ∼12000 is measured in a footprint of 110  μm×300  μm. By heating the HCG with paired metal strip micro-heaters, the optical resonance shifts, which induces phase modulation. A phase shift of ∼1.2π under heating power of ∼32  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.
ISSN:1539-4794
DOI:10.1364/ol.43.000827