Affiliation:
1. Zhejiang University
2. Hefei University of Technology
3. Hefei Guizhen Chip Technologies Co., Ltd.
4. City University of Hong Kong
Abstract
Photonic integrated circuits have garnered significant attention and experienced rapid development in recent years. To provide fundamental building blocks for scalable optical classical and quantum information processing, one important direction is to develop cryogenic compatible photonic integrated devices. Here, we prepare one optical filter on a lithium-niobate-on-insulator (LNOI) platform based on a multimode waveguide grating and verify its availability at temperature from 295 to 7 K. We find that the integrated optical filter still shows good quality under cryogenic conditions, and the shift of the working wavelength at different temperatures is well explained by the index variation of the material. These results advance LNOI integrated optical devices in applications under cryogenic conditions.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Chinese Academy of Sciences Project for Young Scientists in Basic Research
Research and Development Program of Anhui Province
Fundamental Research Funds for the Central Universities