Fig. 3: Decryption performance based on DMNet.
From: High-security learning-based optical encryption assisted by disordered metasurface
a The schematic diagram of the optical setup. b Examples of plaintext for encryption. c The corresponding ciphertexts, i.e., the speckles. d Exampled QR codes. e The decrypted information by inputting (c, d) into the DMNet. The DMNet herein is trained by the RCP data. Inset numbers below each image in (d) are formatted as PCC(SSIM) between b the ground truth and e the decrypted images. SLM spatial light modulator, DM disordered metasurface, HWP half-wave plate, L1, L2 lens, PCC Pearson’s correlation coefficient, RCP right-handed circular polarization, QR quick response, QWP quarter-wave plate, HWP quarter-wave plate, SSIM structure similarity.
