3D-motion phase modulation for protecting image information

Abstract

For most optical encryption mechanisms, craft precision of phase modulation components is finite, restricting information efficient sharing and compatibility with processing. We demonstrate an alternative method with strong practicability in which a random phase is modulated by multiplexed sensing without optical elements, releasing the constraints mentioned above. This is accomplished by dynamic-field integral imaging in three-dimensional space, replacing transient imaging of ordinary light fields. Specifically, information encoding and recovery of intensity and phase with Fourier phase shift law are demonstrated. Axial dimension extends the capacity of key spaces. The simple and flexible optical modulation mechanism also could enable optical asymmetric encryption platforms with high security and low storage capacity configuration.