Electronic skin, a class of wearable electronic sensors that mimic the functionalities of human skin, has made remarkable success in applications including health monitoring, human-machine interaction and electronic-biological interfaces. While electronic skin continues to achieve higher sensitivity and faster response, its ultimate performance is fundamentally limited by the nature of low-frequency AC currents. Herein, highly sensitive skin-like wearable optical sensors are demonstrated by embedding glass micro/nanofibers (MNFs) in thin layers of polydimethylsiloxane (PDMS). Enabled by the transition from guided modes into radiation modes of the waveguiding MNFs upon external stimuli, the skin-like optical sensors show ultrahigh sensitivity (1870 kPa-1), low detection limit (7 mPa) and fast response (10 μs) for pressure sensing, significantly exceeding the performance metrics of state-of-the-art electronic skins. Electromagnetic interference (EMI)-free detection of high-frequency vibrations, wrist pulse and human voice are realized. Moreover, a five-sensor optical data glove and a 2×2-MNF tactile sensor are demonstrated. These initial results pave the way toward a new category of optical devices ranging from ultrasensitive wearable sensors to optical skins.
Ultrasensitive skin-like wearable optical sensors based on glass micro/nanofibers
First published at:Mar 20, 2020
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the National Key Research and Development Program of China (2016YFB1001300), the National Natural Science Foundation of China (No. 11527901) and the Fundamental Research Funds for the Central Universities.
Get Citation: Zhang L, Pan J, Zhang Z, Wu H, Yao N et al. Ultrasensitive skin-like wearable optical sensors based on glass micro/nanofibers. Opto-Electron Adv 3, 190022 (2020).