A temperature-insensitive sensor for glucose brix measurement based on compact spindle-shaped structure with two-mode fiber(TMF)is proposed.Due to the bending of optical fiber caused by flame baking,some of the light en-ergy transmitted in the core leaks into the cladding area as an evanescent wave,which excites the higher-order clad-ding mode of the sensor.The experimental results show that when the length of TMF is 3 cm and the bending diameter is 4 mm,the maximum glucose brix sensitivity of the sensor is 0.368 nm/％from 0 to 21％.The sensor is insensitive to temperature from 10℃to 50℃,which can avoid the problem of temperature cross-sensitivity.A compact spin-dle-shaped sensor is a potential effective sensor with a simple structure,easy fabrication and low cost.The sensor can be used to detect glucose content in areas such as crops quality assessment and the research of pharmacy and bioengi-neering.

Engineering Research Center of Optoelectronic Devices and Communication Technology,Ministry of Education,Tianjin Key Laboratory of Film Electronic and Communication Devices,School of Integrated Circuit Science and En-gineering,Tianjin University of Technology,Tianjin 300384,China

[1]DONG Miaoyun;TONG Zhengrong;ZHANG Weihua;LI Peng;WU Meng;TIAN Xue-.Temperature-insensitive sensor for glucose brix meas-urement based on compact spindle-shaped structure with two-mode fiber)[J].光电子快报（英文版）,2022(12):737-742

bioengi

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