Yu W, Yao N, Pan J, Fang W, Li X et al. Highly sensitive and fast response strain sensor based on evanescently coupled micro/nanofibers. Opto-Electron Adv 5, 210101 (2022). doi: 10.29026/oea.2022.210101
Citation: Yu W, Yao N, Pan J, Fang W, Li X et al. Highly sensitive and fast response strain sensor based on evanescently coupled micro/nanofibers. Opto-Electron Adv 5, 210101 (2022). doi: 10.29026/oea.2022.210101

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Highly sensitive and fast response strain sensor based on evanescently coupled micro/nanofibers

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  • Flexible strain sensors play an important role in electronic skins, wearable medical devices, and advanced robots. Herein, a highly sensitive and fast response optical strain sensor with two evanescently coupled optical micro/nanofibers (MNFs) embedded in a polydimethylsiloxane (PDMS) film is proposed. The strain sensor exhibits a gauge factor as high as 64.5 for strain ≤ 0.5% and a strain resolution of 0.0012% which corresponds to elongation of 120 nm on a 1 cm long device. As a proof-of-concept, highly sensitive fingertip pulse measurement is realized. The properties of fast temporal frequency response up to 30 kHz and a pressure sensitivity of 102 kPa−1 enable the sensor for sound detection. Such versatile sensor could be of great use in physiological signal monitoring, voice recognition and micro-displacement detection.
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