Ultrasensitive temperature sensor based on an isopropanol-sealed optical microfiber taper
Xue Yang(State Key Laboratory on Integrated Optoelectronics), Yong‐Sen Yu(State Key Laboratory on Integrated Optoelectronics), Rui Yang(State Key Laboratory on Integrated Optoelectronics), Chuang Wang(Jilin University), Chao Chen(State Key Laboratory on Integrated Optoelectronics), Jingchun Guo(Jilin University), Xuanyu Zhang(Jilin University), Cong‐Cong Zhu(Jilin University), Hong‐Bo Sun(Jilin University)
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Abstract
We demonstrate an ultrasensitive temperature sensor based on an isopropanol-sealed optical microfiber taper (OMT) in a capillary. The OMT is highly sensitive to ambient refractive index (RI) with a maximum sensitivity of 18989 nm/RI unit in the range of 1.3955-1.4008. The thermo-optic effect of isopropanol and the thermal expansions of the sealant and sealed liquid turn the OMT into an ultrasensitive temperature sensor with the maximum sensitivity of -3.88 nm/°C in the range of 20°C-50°C. The temperature sensitivity contributions from different mechanisms are also investigated theoretically and experimentally.
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