Optical data encryption using time-dependent dynamics of refractive index changes in LiNbO3

Sando, Daniel & Jaatinen, Esa (2013) Optical data encryption using time-dependent dynamics of refractive index changes in LiNbO3. Optics Express, 21(17), pp. 19510-19517.

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Abstract

We present a method for optical encryption of information, based on the time-dependent dynamics of writing and erasure of refractive index changes in a bulk lithium niobate medium. Information is written into the photorefractive crystal with a spatially amplitude modulated laser beam which when overexposed significantly degrades the stored data making it unrecognizable. We show that the degradation can be reversed and that a one-to-one relationship exists between the degradation and recovery rates. It is shown that this simple relationship can be used to determine the erasure time required for decrypting the scrambled index patterns. In addition, this method could be used as a straightforward general technique for determining characteristic writing and erasure rates in photorefractive media.

Impact and interest:

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2 citations in Web of Science®

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41 since deposited on 18 Sep 2013
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ID Code: 62605
Item Type: Journal Article
Refereed: Yes
Keywords: nonlinear optics, photorefractive, optical data storage, lithium niobate
DOI: 10.1364/OE.21.019510
ISSN: 1094-4087
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500) > Nonlinear Optics and Spectroscopy (020503)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Optical Society of America
Copyright Statement: This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: [http://www.opticsinfobase.org/oe/fulltext.cfm?uri=oe-21-17-19510&id=260180]. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Deposited On: 18 Sep 2013 00:27
Last Modified: 20 Sep 2013 05:10

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