Abstract

We theoretically investigate the athermal constructions to cancel the thermorefractive effect of a hybrid ${\rm Si_3}{\rm N_4} $–$ {\rm TiO_2}$ microring, which merges two materials with opposite thermo-optical coefficients (TOCs). The analytical and numerical results predict that the thermorefractive effect can be reduced under the appropriate parameters. In addition, the soliton state is easily accessed under the athermal condition. The thermorefractive noise due to the fluctuation of the microresonator temperature caused by the heat exchange between the microresonator and the surrounding environment is also suppressed by one order of magnitude, which is critical for the potential applications of soliton microcombs, such as spectroscopy, optical clocks and microwave generation.

© 2022 Optica Publishing Group

Thermal oscillation in the hybrid Si₃N₄ − TiO₂ microring

Zheng-Yu Wang, Pi-Yu Wang, Shuai Wan, Zi Wang, Qinghai Song, Guang-Can Guo, and Chun-Hua Dong
Opt. Express 31(3) 4569-4579 (2023)

Thermal tuning of mode crossing and the perfect soliton crystal in a Si₃N₄ microresonator

Jin Li, Shuai Wan, Jin-Lan Peng, Zheng-Yu Wang, Rui Niu, Chang-Ling Zou, Guang-Can Guo, and Chun-Hua Dong
Opt. Express 30(8) 13690-13698 (2022)

Silicon nitride/titanium oxide hybrid waveguide design enabling broadband athermal operation

Jianbin Ma, Yu Sun, and Shaowu Chen
Appl. Opt. 58(19) 5267-5272 (2019)

Sulfur-rich chalcogenide claddings for athermal and high-Q silicon microring resonators

Philippe Jean, Alexandre Douaud, Tristan Thibault, Sophie LaRochelle, Younès Messaddeq, and Wei Shi
Opt. Mater. Express 11(3) 913-925 (2021)

Turn-key Kerr soliton generation and tunable microwave synthesizer in dual-mode Si₃N₄ microresonators

Haizhong Weng, Michael McDermott, Adnan Ali Afridi, Huilan Tu, Qiaoyin Lu, Weihua Guo, and John F. Donegan
Opt. Express 32(3) 3123-3137 (2024)