All-optically controlled light valve assembled by photorefractive crystal and PDLC hybrid structure

Vera Marinova, Ren Chung Liu, Ming S. Chen, Shiuan-Huei Lin, Yi-Hsin Lin, Ken-Yuh Hsu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


A light-valve device, assembled by Ru-doped Bi12SiO20 (BSO) photoconductive substrate and polymer dispersed liquid crystal layer is proposed, in which all the processes are controlled by the near infrared light. Laser beam illumination (Gaussian shape) on BSO:Ru crystal caused charge carriers generation, which migrate and form an inhomogeneous distribution and subsequent space charge field. This surface-localized electromagnetic field penetrates into the PDLC layer and modulate the orientation of the liquid crystals, that caused reverse of the device initial opaque state to the highly transparent one. The proposed structure is simple and easy to fabricate, without requirements of ITO contacts and alignment layers and opens further possibilities for near-infrared applications.

Original languageEnglish
Title of host publicationHolography
Subtitle of host publicationAdvances and Modern Trends IV
EditorsMiroslav Hrabovsky, Antonio Fimia, John T. Sheridan
ISBN (Electronic)9781628416299
StatePublished - 2015
EventHolography: Advances and Modern Trends IV - Prague, Czech Republic
Duration: 15 Apr 201516 Apr 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceHolography: Advances and Modern Trends IV
Country/TerritoryCzech Republic


  • Hybrid structure
  • Inorganic crystals
  • Light valves
  • Photorefractive effect
  • Polymer dispersed liquid crystals
  • Space-charge field


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