Changes in optical thicknesses of Ge and SiO thin films and spectral characteristics of narrowband filters at cryogenic temperatures

Gusev, A.G., Khasanov, A.M., Nurullin, I.Z., Koltsov, A.Y., Galiev, A.N., Gilfanov, A.R., Galiev, R.R.

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Гусев А.Г., Хасанов А.М., Нуруллин И.З., Кольцов А.Ю., Галиев А.Н., Гильфанов А.Р., Галиев Р.Р. Изменение оптических толщин тонких плёнок Ge, SiO и спектральных характеристик узкополосных фильтров при криогенных температурах // Оптический журнал. 2022. Т. 89. № 10. С. 51–57. http://doi.org/10.17586/1023-5086-2022-89-10-51-57

Gusev A.G., Khasanov A.M., Nurullin I.Z., Koltsov A.Yu., Galiev A.N., Gilfanov A.R., Galiev R.R. Changes in optical thicknesses of Ge and SiO thin films and spectral characteristics of narrowband filters at cryogenic temperatures [in Russian] // Opticheskii Zhurnal. 2022. V. 89. № 10. P. 51–57. http://doi.org/10.17586/1023-5086-2022-89-10-51-57

For citation (Journal of Optical Technology):

A. G. Gusev, A. M. Khasanov, I. Z. Nurullin, A. Yu. Kol’tsov, A. N. Galiev, A. R. Gil’fanov, and R. R. Galiev, "Changes in optical thicknesses of Ge and SiO thin films and spectral characteristics of narrowband filters at cryogenic temperatures," Journal of Optical Technology. 89(10), 595-599 (2022). https://doi.org/10.1364/JOT.89.000595

Abstract:

Subject of study. Two narrowband filters with Ge and SiO resonant layers were investigated both at room and cryogenic temperatures of 293 and 80 K, respectively. Aim of study. The deposition of bandpass filters with predefined deviations of optical thickness layers under operating conditions at cryogenic temperatures was considered. The presented design of an optical interference coating increases the transmission coefficient in the operating spectral ranges during its operation at cryogenic temperatures. Method. An antireflective bandpass coating constituting a pair of Ge-SiO film-forming materials was deposited onto a substrate made of an optical material using vacuum deposition. The layer thicknesses were controlled during their deposition using an optical control system. Main results. The obtained spectral characteristics of two narrowband filters are presented herein. The optical thicknesses of the filters with resonant layers made of Ge and SiO and thickness variations at the temperatures of 293 and 80 K were determined by an iteration method via the positions of the wavelengths of maximum transmission of the filters. Practical significance. The spectral characteristics of the filters with SiO resonant layers demonstrated smaller changes at cryogenic temperatures than those of the filters with Ge resonant layers.

Keywords:

Ge, SiO, optical thickness, spectral characteristics, cryogenic temperature, narrow-band interference filter, thin films

OCIS codes: 310.6860, 310.4165

References:

1. I. S. Gainutdinov, E. A. Nesmelov, A. V. Mikhailov, V. P. Ivanov, and G. I. Abzalova, Properties and Fabrication Methods of Interference Coatings for Optical Instrumentation (Fen, Kazan, 2003).
2. I. S. Gainutdinov, A. G. Gusev, A. Yu. Kol’tsov, A. M. Khasanov, and R. I. Potapov, “Optical properties of PbTe-ZnSe films at cryogenic temperatures,” Kontenant 14(2), 46 (2015).
3. W. Feng and P. Zhou, “Optical absorption of Te-enriched PbTe coatings,” Infrared Phys. 31(6), 571–573 (1991).
4. W. Feng and P. Zhou, “Determination of the performance of edge filters containing PbTe on cooling,” Infrared Phys. 33(1), 1–7 (1992).
5. L. Xu, H. Zhou, Y. He, K. Zhang, S. Wu, and Y. Xiong, “Temperature coefficient of the refractive index for PbTe film,” Chin. Opt. Lett. 15(4), 101–103 (2017).
6. W. Feng and Y. Yan, “Temperature effects on the refractive index of lead telluride and zinc selenide,” Infrared Phys. 30(4), 371–373 (1990).
7. J. M. Hoffman and W. L. Wolfe, “Cryogenic refractive indices of ZnSe, Ge, and Si at 10.6 μm,” Appl. Opt. 30(28), 4014–4016 (1991).
8. Y. Cai, D. Liu, and H. Luo, “Design and fabrication of 3.5–4.0 μm band-pass filter working at cryogenic temperature,” Chin. J. Lasers 39(1), 0107001 (2012).
9. R. R. Galiev, I. Kh. Nagimov, I. Z. Nurullin, and I. I. Gilazutdinov, “Design optimization of the band-pass interference filter operating in the mid-IR spectral range (5–8 μm) at cryogenic temperatures,” Kontenant 3(2), 54–60 (2021).
10. A. G. Gusev, A. Yu. Kol’tsov, and A. M. Khasanov, “Thermally stable interference filters for the IR spectral range,” Kontenant 16(2), 51 (2017).
11. A. Yu. Kol’tsov and A. M. Khasanov, “Optical properties of PbTe films at cryogenic temperatures,” in Proceedings of the XXII International Youth Scientific Conference Tupolev Readings (2015), pp. 447–450.
12. G. Khass, E. Ritter, R. Yakobson, Z. G. Meiksin, A. K. Dzhonsher, R. M. Khill, Kh. S. Natanson, and Ya. Goldberg, Thin Film Physics (Mir, Moscow, 1978), pp. 92–93.
13. I. S. Gainutdinov, A. G. Gusev, A. Yu. Kol’tsov, A. M. Khasanov, and A. N. Galiev, “Interference filters for deeply cooled photodetectors,” in Proceedings of the XXIII International Scientific Technical Conference on Photonics and Night Vision Devices (2014), pp. 365–367.
14. G. V. Rozenberg, Optics of Thin-Film Coatings (Fizmatlit, Moscow, 1958).

15. M. Kh. Azamatov, R. D. Aliakberov, and I. S. Gainutdinov, “Program for the calculation of spectral properties of optical interference coatings,” Russian state registration certificate of a computer program 2016619339 (2016).