Andrianov Alexey V, Marisova Maria P, Anashkina Elena A
Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov Street, 603950 Nizhny Novgorod, Russia.
Advanced School of General and Applied Physics, Lobachevsky State University of Nizhny Novgorod, 23 Gagarin Ave., 603022 Nizhny Novgorod, Russia.
Sensors (Basel). 2022 Jun 20;22(12):4636. doi: 10.3390/s22124636.
Glass microresonators with whispering gallery modes (WGMs) have a lot of diversified applications, including applications for sensing based on thermo-optical effects. Chalcogenide glass microresonators have a noticeably higher temperature sensitivity compared to silica ones, but only a few works have been devoted to the study of their thermo-optical properties. We present experimental and theoretical studies of thermo-optical effects in microspheres made of an AsS chalcogenide glass fiber. We investigated the steady-state and transient temperature distributions caused by heating due to the partial thermalization of the pump power and found the corresponding wavelength shifts of the WGMs. The experimental measurements of the thermal response time, thermo-optical shifts of the WGMs, and heat power sensitivity in microspheres with diameters of 80-380 µm are in a good agreement with the theoretically predicted dependences. The calculated temperature sensitivity of 42 pm/K does not depend on diameter for microspheres made of commercially available chalcogenide fiber, which may play an important role in the development of temperature sensors.
具有回音壁模式（WGMs）的玻璃微谐振器有许多多样化的应用，包括基于热光效应的传感应用。与二氧化硅微谐振器相比，硫系玻璃微谐振器具有明显更高的温度灵敏度，但仅有少数研究致力于其热光特性的研究。我们展示了对由AsS硫系玻璃光纤制成的微球中热光效应的实验和理论研究。我们研究了由于泵浦功率的部分热化导致加热所引起的稳态和瞬态温度分布，并发现了WGMs相应的波长偏移。对直径为80 - 380 µm的微球中热响应时间、WGMs的热光偏移以及热功率灵敏度的实验测量结果与理论预测的相关性吻合良好。对于由市售硫系光纤制成的微球，计算得出的42 pm/K的温度灵敏度不依赖于直径，这可能在温度传感器的开发中发挥重要作用。
