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a) Schematic of the unit cell. b) SEM images of fabricated patch antennas array with the width l = 3 µm, length w = 1 µm, and p = 4.2 µm. c,d) The co‐polarization and cross‐polarization reflectance in c) amorphous and d) crystalline states. e) The PCR with respect to the wavelength in amorphous (A) and crystalline (C) states.
