Experimental optical encryption with full complex modulation

• Juan González Moncada, Alejandro Velez-Zea, and John Barrera Ramírez
• received 01/09/2024; accepted 04/30/2024; posted 04/30/2024; Doc. ID 518364
• Abstract: We present a novel method to achieve experimental encryption using double random phase encoding with full complexmodulation and a single phase-only spatial light modulator. Our approach uses double phase encoding to generate phaseonly holograms containing complex-valued input planes for a joint transform correlator (JTC) cryptosystem. Thisapproach enables users to independently manipulate both the phase and amplitude of the cryptographic keys and objects,thereby significantly enhancing the versatility of the optical cryptosystem. We validate the capabilities of our proposedscheme by generating optimized random phase masks and using them to experimentally encrypt various grayscale andbinary objects. The experimental complex modulation obtained with the system detailed in this work, in conjunction withoptimized random phase masks results in an enhancement in the quality of the decrypted objects during reconstruction.Both numerical simulations and experimental findings corroborate the effectiveness of our proposal.