Design of a novel encryption scheme using a single-beam co-axial holographic storage system

Abstract

In this era of information, the need for storing massive data is growing dramatically. When comparing with other data storage techniques, holographic data storage could meet today‟s needs as it provides huge storage capacity and high security level. Among different types of holographic systems, the coaxial holographic system is more compact and has greater tolerance to environmental disturbances such as mechanical vibration. In this project, we implement a multiplexed coaxial holographic data storage system using a single laser beam, in which data are stored two-dimensionally in the same area of a photographic plate and hence increasing the data storage density. The object and reference beams are constructed from a single laser beam by employing a reflective type of spatial light modulator (SLM) (LC-R 2500 by Holoeye). Two different phase modulation techniques, the grating diffraction and the speckle interference, are applied to generate reference beams. By increasing the number of reference beams, more data can be recorded onto the same area of a photographic plate. In order to readout the particular stored data from the multiplexed hologram, the corresponding encoding reference beam should be applied.