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(a) Sensing area of electric field sensor based on Mach-Zehnder interferometer and LiNbO3 [80], (b) sensing unit based on Pockels effect of LiNbO3 [84], (c) sensor probe structure of tapered fiber and waveguide [85], (d) sensor head configuration of D-shaped fiber and LiNbO3 slab [89]; permission conveyed through the Copyright Clearance Center, Inc.
