Polarization encoding for optical encryption using twisted nematic liquid crystal spatial light modulators

Chau Jern Cheng, Mao Ling Chen

Research output: Contribution to journalArticle

29 Citations (Scopus)


We propose and demonstrate a polarization-encoded encryption system based on a doubly exclusive OR logic (XOR) operation using cascaded twisted nematic liquid crystal spatial light modulators. The transfer characteristic of the encryption system is analyzed by the Jones matrix method to yield the suitable polarization modulation for optical realization. An experimental demonstration reveals that the binary image encryption/decryption is achieved with fair image quality by selecting the orientation of polarization and the modulation conditions. Both analytical and experimental results are presented and discussed.

Original languageEnglish
Pages (from-to)45-52
Number of pages8
JournalOptics Communications
Issue number1-3
Publication statusPublished - 2004 Jul 1



  • Liquid crystal display
  • Optical encryption
  • Spatial light modulator

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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