Study of thermo-optical properties of lithium niobate on an insulator at cryogenic temperatures

Venediktov I.O., Kobtsev D.M., Svyatoukh S.S., Golikov A.D., An, P.P., Kovalyuk V.V., Goltsman, G.N.

For Russian citation (Opticheskii Zhurnal):

Венедиктов И.О., Кобцев Д.М., Святодух С.С., Голиков А.Д., Ан П.П., Ковалюк В.В., Гольцман Г.Н. Изучение термооптических свойств ниобата лития на изоляторе при криогенных температурах // Оптический журнал. 2025. Т. 92. № 12. С. 3–11. http://doi.org/10.17586/1023-5086-2025-92-12-3-11

Venediktov I.O., Kobtsev D.M., Svyatodukh S.S., Golikov A.D., An P.P., Kovalyuk V.V., Goltsman G.N. Study of thermo-optical properties of lithium niobate on an insulator at cryogenic temperatures [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 11. P. 3–11. http://doi.org/10.17586/1023-5086-2025-92-12-3-11

For citation (Journal of Optical Technology):

Abstract:

Subject of the study. Thermo-optical properties of lithium niobate on an insulator when the temperature drops from room temperature to helium. Aim of the work. Determination of the temperature dependence of the effective refractive index of a waveguide over a wide temperature range (6–294 K). Method. The measured transmission spectra of silicon nitride microring resonators in a cryostat were processed and compared with literature data to confirm the correctness of the technique used. Then, repeated measurements of the transmission spectra of lithium niobate microring resonators in a cryostat were carried out, followed by mathematical processing of the experimental data. Main results. The values of the rate of change of the effective refractive index of lithium niobate on the insulator were found to be 8,81×10–6 K–1 at 294 K and 2,74×10–7 K–1 at 6 K. The Q-factor values varied parabolically from 20,000 (292 K) to 18,000 (6 K) with a maximum of 24,000 at a temperature of 150 K. Practical significance. Results obtained can be used to design integrated optics devices made of lithium niobate operating at cryogenic temperatures to create a quantum computer powered by photons and ions.

Keywords:

integrated optics, lithium niobate on an insulator, silicon nitride, thermo-optical effect

Acknowledgements:

the work was supported by the Russian Science Foundation grant No. 23-79-00056 (experimental study of photonic integrated circuit) and the Ministry of Science and Higher Education FSME-2025-0004 (fabrication of photonic integrated circuit)

OCIS codes: 130.3120, 130.3730

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