Journal
SENSORS
Volume 22, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/s22124636
Keywords
microresonator with whispering gallery modes (WGMs); As2S3 chalcogenide glass microsphere; thermo-optical effect; thermo-optical sensitivity
Funding
- Ministry of Science and Higher Education of the Russian Federation [0030-2021-0012, 075-15-2021-633]
- Russian Science Foundation [20-72-10188]
- Russian Science Foundation [20-72-10188] Funding Source: Russian Science Foundation
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In this study, experimental and theoretical investigations of thermo-optical effects in microspheres made of As2S3 chalcogenide glass fiber were presented. The results showed good agreement with the theoretically predicted dependences.
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 As2S3 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 mu m 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.
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