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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/1373

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dc.contributor.authorNishchal, Naveen Kumar-
dc.contributor.authorJoseph, Joby-
dc.contributor.authorSingh, Kehar-
dc.date.accessioned2006-02-22T03:56:56Z-
dc.date.available2006-02-22T03:56:56Z-
dc.date.issued2004-
dc.identifier.citationOptics and Lasers in Engineering, 42(2), 141-151en
dc.identifier.urihttp://eprint.iitd.ac.in/dspace/handle/2074/1373-
dc.description.abstractIn this paper, we implement a fully phase-encrypted memory system using cascaded extended fractional Fourier transform (FRT). We encrypt and decrypt a two-dimensional image obtained from an amplitude image. The full phase image to be encrypted is fractional Fourier transformed three times and random phase masks are placed in the two intermediate planes. Performing the FRT three times increases the key size, at an added complexity of one more lens. The encrypted image is holographically recorded in a photorefractive crystal and is then decrypted by generating through phase conjugation, the conjugate of the encrypted image. A lithium niobate crystal has been used as a phase contrast filter to reconstruct the decrypted phase image, alleviating the need of alignment in the Fourier plane making the system rugged.en
dc.format.extent493347 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.subjectOptical encryption/decryptionen
dc.subjectFractional Fourier transformen
dc.subjectPhotorefractiveen
dc.subjectPhase conjugationen
dc.subjectPhase contrasten
dc.titleFully phase-encrypted memory using cascaded extended fractional Fourier transformen
dc.typeArticleen
Appears in Collections:Physics

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