Real-time terahertz meta-cryptography using polarization-multiplexed graphene-based computer-generated holograms

• DOI: 10.1515/nanoph-2020-0110
• Publication Date: 2020-06-30T07:21:22Z
• Authors: Hamid Rajabalipanah; Kasra Rouhi; Ali Abdolali; Shahid Iqbal; Lei Zhang; Shuo Liu
• Keywords: terahertz; Physics; QC1-999; graphene; meta-cryptography; 02 engineering and technology; 0210 nano-technology; hologram; digital metasurface

Abstract As one of the cutting-edge technologies in advanced information science, wave-based cryptography is a prerequisite to enable plethora secure encrypting platforms which can be realized by smart multiplexing techniques together with suitable metasurface holograms (meta-holograms). Here, relying on polarization multiplicity and re-writability computer-generated meta-hologram, fully communication protocol elaborately developed at terahertz spectrum host unique merits for exploring real-time metasurface-based (meta-cryptography) where highly restricted access imposed. The proposed meta-cryptography exploits two dynamic near-field channels meta-hologram whose instantaneously re-written without any rotation high contrast acceptable frequency bandwidth. constructed based weighted Gerchberg–Saxton algorithm via two-dimensional array vertical graphene strips anisotropic reflection merely determined external biasing conditions. Several illustrative examples have been presented demonstrate perfect secrecy cross-talk meta-cryptography. Numerical simulations corroborate well our theoretical predictions. first demonstration THz meta-cryptography, deciphered into manifold customized messages would instrumental data storage systems offering far higher rates than electronic encryption deliver.