Photorefractive effect induced by polarization gratings in dye-doped liquid crystals

Jyun Ruei Wang, Chia Rong Lee, Mei Ru Lee, Andy Y.G. Fuh

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


We report on the photorefractive effect induced by a polarization grating in the presence of dc voltage in a dye-doped liquid-crystal (DDLC) film. The writing beams are two orthogonally (left-and right-circularly) polarized laser beams that create a spatially polarization-modulated interference field with constant intensity. The photorefractivity is ascribed to the absorption anisotropy of the azo dye. The unique dichroism of a DDLC cell causes a spatial variation in the absorption of light in response to a polarization-modulated interference field. Such a variation establishes a space-charge field in the presence of dc voltage, generating photorefractivity. Two-beam couplings were also verified and measured dynamically during the formation of the photorefractive grating in this study.

Original languageEnglish
Pages (from-to)110-112
Number of pages3
JournalOptics Letters
Issue number1
Publication statusPublished - 2004 Jan 1

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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