Electro- and photo-controllable spatial filter based on a liquid crystal film with a photoconductive layer

S. Y. Huang, T. C. Wung, A. Y.G. Fuh, H. C. Yeh, C. Y. Huang, C. M. Ma, S. C. Huang, T. S. Mo, Chia-Rong Lee

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6 Citations (Scopus)

Abstract

This work presents an electro- and photo-controllable spatial filter that is based on a liquid crystal (LC) film with a photoconductive layer. The controllable spatial filter can be formed because of the controllability of the photoelectro-induced screen effect of the space charge in the LC cell. An applied dc voltage or incident pumped intensity can be controlled to enable different spatial distributions of the diffraction pattern of the target object to be selected for filtering by the LC cell, such that various reconstructed images can be obtained. A simulation using Fourier analysis is developed, and its results agree closely with experimental results. Additionally, the LC spatial filter has the extra advantage of controllable low or high filtering functions: they are controlled by switching the configuration between normally black and normally white modes.

Original languageEnglish
Pages (from-to)749-752
Number of pages4
JournalApplied Physics B: Lasers and Optics
Volume97
Issue number4
DOIs
Publication statusPublished - 2009 Dec 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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    Huang, S. Y., Wung, T. C., Fuh, A. Y. G., Yeh, H. C., Huang, C. Y., Ma, C. M., Huang, S. C., Mo, T. S., & Lee, C-R. (2009). Electro- and photo-controllable spatial filter based on a liquid crystal film with a photoconductive layer. Applied Physics B: Lasers and Optics, 97(4), 749-752. https://doi.org/10.1007/s00340-009-3788-1