Laser & Optoelectronics Progress, Volume. 62, Issue 9, 0916001(2025)
Terahertz Temperature Sensor Based on Amorphous Strontium Titanate Film with Graphene
Strontium titanate (STO) exhibits favorable thermoelectric properties and significant potential for application in temperature sensing. Herein, we propose a terahertz metamaterial temperature sensor based on amorphous STO combined with graphene, where the dielectric constant can be adjusted by changing the temperature of the STO film. Based on this property, the temperature sensor can be used for temperature sensing in the range from 300 to 620 K. The temperature sensor is characterized by a blue shift of the terahertz absorption peak as the temperature increases. The blue shift of the terahertz absorption peaks with increasing temperature confirms its temperature-sensing capability, and the terahertz temperature sensor has a high sensitivity of 0.51 GHz/K. To investigate the sensor's performance in a multidimensional manner, a graphene thin film is transferred to the surface of the temperature sensor via wet transfer. Results show that the combination of STO and graphene thin film improves the performance of the sensor compared with the previous method. Specifically, the amplitude of the sensor improves significantly. This study not only provides a new scenario for the application of amorphous STO in temperature sensors but also offers a new possibility for the design of easy-to-process, low-cost, high-performance amorphous STO terahertz devices.
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Zhaoyang Shi, Yonggang Zhang, Lanju Liang, Zhenhua Li, Haiyun Yao, Huihan Tian. Terahertz Temperature Sensor Based on Amorphous Strontium Titanate Film with Graphene[J]. Laser & Optoelectronics Progress, 2025, 62(9): 0916001
Category: Materials
Received: Jul. 29, 2024
Accepted: Sep. 2, 2024
Published Online: Apr. 21, 2025
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CSTR:32186.14.LOP241763