Image Encryption Through Dual-Pass Modulated Azimuthally Polarized Vector Field

In this letter, we propose a novel image encryption technique through efficient utilization of spatially separated orthogonal polarization components of dual-pass-modulated azimuthally polarized vector beams. Such beams hold spatially varying azimuth of polarization ellipse in its plane. The demonstrated scheme utilizes a non-interferometric experimental set-up for multiple images encryption simultaneously. Exploiting the two orthogonal polarization components of light would benefit in high-dimensional encoding, this could be helpful in addressing the issue of ‘capacity crunch’ in secure optical communication systems.