Space-variant polarization scrambling for image encryption obtained with subwavelength gratings

Gabriel Biener, Avi Niv, Vladimir Kleiner, Erez Hasman

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We present an optical encryption method based on geometrical phase, which is originated from polarization manipulation. The decrypted picture is retrieved by measuring the polarization of the beam emerging from the encrypted element. The encrypted element is achieved by using a computer-generated space-variant subwavelength dielectric grating. Theoretical analyses of the optical concept by use of Jones and Mueller formalisms, as well as experimental results including full optical decryption process are introduced. Digital implementation and the possibility of using watermarking are also discussed.

Original languageEnglish
Pages (from-to)5-12
Number of pages8
JournalOptics Communications
Volume261
Issue number1
DOIs
StatePublished - 1 May 2006
Externally publishedYes

Keywords

  • Geometrical phase
  • Optical encryption
  • Pancharatnam phase
  • Polarization encoding
  • Subwavelength gratings

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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