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High-Sensitive Temperature Sensor Based on Cascaded Polymer-Air Cavities
IEEE Photonics Technology Letters ( IF 2.3 ) Pub Date : 2021-06-14 , DOI: 10.1109/lpt.2021.3088944 Yinggang Liu , Bowen Li , Xiaoya Song , Liang Huang , Jingfei Dong
IEEE Photonics Technology Letters ( IF 2.3 ) Pub Date : 2021-06-14 , DOI: 10.1109/lpt.2021.3088944 Yinggang Liu , Bowen Li , Xiaoya Song , Liang Huang , Jingfei Dong
A cascaded Fabry-Perot interferometers (FPIs) structure based on polymer-air cavities is proposed and demonstrated. The structure can be easily manufactured by inserting a section of single-mode fiber (SMF) with a flat end-face into the silica capillary tube (SCT), then filling the SCT with polymer under capillary action, and last inserting another segment of SMF from the other end of the SCT. Thus, a cascaded FPIs structure based on polymer-air cavities are formed. Through tracing the dip wavelengths of superimposed spectra resulting from the two FPIs in temperature change, experimental results show that the spectral dip fringes have clearly linear blue-shifts with the increase of temperature. The linearity of fitting curve exceeds to 0.99, and the temperature sensitivity of sensor is -6.76 nm/°C in temperature range of 29~ 35 °C. Furthermore, it is pointed out for the first time that a closed air-cavity will have a certain inhibitory effect on the thermal expansion of the polymer. Due to serial merits of higher temperature sensitivity and ease of fabrication, the proposed sensor is more potentially competitiveness in practical applications.
更新日期：2021-06-14
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