Abstract
Random phase encoding is a unique technique for volume hologram which can be applied to various applications such as holographic multiplexing storage, image encryption, and optical sensing. In this review article, we first review and discuss diffraction selectivity of random phase encoding in volume holograms, which is the most important parameter related to multiplexing capacity of volume holographic storage. We then review an image encryption system based on random phase encoding. The alignment of phase key for decryption of the encoded image stored in holographic memory is analyzed and discussed. In the latter part of the review, an all-optical sensing system implemented by random phase encoding and holographic interconnection is presented.
Highlights
Volume holographic storage has received increasing attention in the field of optical memory and information processing owing to its high access rate, high selectivity and large storage capacity [1,2,3].The ability of parallel processing in volume holographic storage is an excellent characteristic that the current commercial storage technology cannot compete with
We have first presented the three-dimensional shifting selectivity of volume holograms based on random phase encoding with ground glass
The shifting selectivity depends on the diameter of the illumination region on the random phase plate, the thickness of the hologram and the distance between them
Summary
Volume holographic storage has received increasing attention in the field of optical memory and information processing owing to its high access rate, high selectivity and large storage capacity [1,2,3]. A useful and effective way to reproduce such a phase key has been proposed and demonstrated [28] Another characteristic of high diffraction selectivity in holographic storage with random phase encoding is the application of optical sensing and optical interconnection [39,40,41,42,43,44]. Random phase encoding has been applied to optical information processing, including holographic multiplexing [11,12,13,14,15,18,20], security data storage [11,12,13,14,15,16,17,18,19,20,21,22,31,32,33,34,35,36,37,38], optical sensing and optical interconnection [39,40,41,42,43,44].
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