Optical image encryption based on polarization encoding by liquid crystal spatial light modulators

Han Yen Tu, Chau Jern Cheng, Mao Ling Chen

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

This work describes a polarization-encoding scheme with cascaded liquid crystal spatial light modulators for two-dimensional exclusive OR logic encryption. The transfer characteristic of the encryption system is analysed to determine suitable polarization modulation for optical realization. Performance is compared across systems that use various displays, including twisted nematic, supertwisted nematic and homogeneously parallel aligned nematic liquid crystal devices. Experiments show that binary image encryption/decryption is accomplished with fair image quality by choosing the orientation of the polarization and modulation conditions. Both simulated and experimental results are presented and discussed.

Original languageEnglish
Pages (from-to)524-528
Number of pages5
JournalJournal of Optics A: Pure and Applied Optics
Volume6
Issue number6
DOIs
Publication statusPublished - 2004 Jun 1

Keywords

  • Liquid crystal displays
  • Optical encryption
  • Polarization-encoding

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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