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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 14 — May. 10, 2001
  • pp: 2310–2315

Secure optical memory system with polarization encryption

Xiaodi Tan, Osamu Matoba, Yoshiko Okada-Shudo, Masafumi Ide, Tsutomu Shimura, and Kazuo Kuroda  »View Author Affiliations


Applied Optics, Vol. 40, Issue 14, pp. 2310-2315 (2001)
http://dx.doi.org/10.1364/AO.40.002310


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Abstract

A novel secure holographic memory system with polarization encoding is proposed. Two-dimensional original data are encoded as a two-dimensional polarization distribution. The polarization state at each pixel is scrambled by a mask that changes the polarization state into a random state. The mask can rotate the direction of the principal axes of the elliptically polarized light and can change the phase retardation at each pixel. The light with the random polarization state is stored as a hologram that can produce the vector phase-conjugate beam. In the decryption the vector phase-conjugation readout can recover the original polarization state by use of the same mask used in the encryption. Experimental results of encryption and decryption with a bacteriorhodopsin film are presented.

© 2001 Optical Society of America

OCIS Codes
(160.2900) Materials : Optical storage materials
(190.5040) Nonlinear optics : Phase conjugation
(190.5330) Nonlinear optics : Photorefractive optics
(210.0210) Optical data storage : Optical data storage
(210.2860) Optical data storage : Holographic and volume memories
(260.5430) Physical optics : Polarization

History
Original Manuscript: September 5, 2000
Revised Manuscript: December 13, 2000
Published: May 10, 2001

Citation
Xiaodi Tan, Osamu Matoba, Yoshiko Okada-Shudo, Masafumi Ide, Tsutomu Shimura, and Kazuo Kuroda, "Secure optical memory system with polarization encryption," Appl. Opt. 40, 2310-2315 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-14-2310


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References

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