A simple optical encryption based on shape merging technique in periodic diffraction correlation imaging.

In Periodic diffraction correlation imaging (PDCI), the images of several objects located in different spatial positions can be integrated into one image following certain rules, which is named shape merging. In this paper, we proposed and demonstrated this new technique. It can be realized without SLM or beam-splitter. And this effect can find novel application in optical encryption, enabling transmission of object information to a remote place secretly.