Symmetry filter using anisotropic self-diffraction in BaTiO3

Bor Wang, Ching Cherng Sun, Arthur E.T. Chiou

Research output: Contribution to journalConference articlepeer-review


Using anisotropic self-diffraction in BaTiO3, we propose a novel optical symmetry filter which the filter allows us to distinguish a centro-symmetric pattern from a non-centro-symmetric pattern easily with scale invariance. This filter is self-referential, so no extra reference target is required. Both of the theoretical explanation and experimental demonstration are shown.

Original languageEnglish
Pages (from-to)209-213
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventPhotorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV - San Diego, CA, United States
Duration: 22 Jul 199823 Jul 1998


  • Pattern recognition and feature extraction
  • Photorefractive nonlinear optics
  • Volume holographic grating


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