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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 25 — Dec. 7, 2009
  • pp: 22386–22392

All-optical and polarization-independent spatial filter based on a vertically-aligned polymer-stabilized liquid crystal film with a photoconductive layer

Chia-Yi Huang, Jia-Ming Ma, Tin-Shan Mo, Kuo-Ching Lo, Kuang-Yao Lo, and Chia-Rong Lee  »View Author Affiliations


Optics Express, Vol. 17, Issue 25, pp. 22386-22392 (2009)
http://dx.doi.org/10.1364/OE.17.022386


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Abstract

An all-optical and polarization-independent spatial filter was developed in a vertically-aligned (VA) polymer-stabilized liquid crystal (PSLC) film with a photoconductive (PC) layer. This spatial filter is based on the effect of light on the conductivity of PC layer: high (low)-intensity light makes the conductivity of the PC layer high (low), resulting in a low (high) threshold voltage of the PC-coated VA PSLC cell. Experimental results indicate that this spatial filter is a high-pass filter with low optical-power consumption (about 1.11 mW/cm2) in an optical Fourier transform system. The high-pass characteristic was confirmed by simulation. Accordingly, the all-optical and polarization-independent spatial filter can be used to enhance the edges of images.

© 2009 OSA

OCIS Codes
(070.6110) Fourier optics and signal processing : Spatial filtering
(100.1160) Image processing : Analog optical image processing
(160.5140) Materials : Photoconductive materials
(160.5470) Materials : Polymers
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Fourier Optics and Signal Processing

History
Original Manuscript: October 1, 2009
Revised Manuscript: November 3, 2009
Manuscript Accepted: November 17, 2009
Published: November 23, 2009

Citation
Chia-Yi Huang, Jia-Ming Ma, Tin-Shan Mo, Kuo-Ching Lo, Kuang-Yao Lo, and Chia-Rong Lee, "All-optical and polarization-independent spatial filter based on a vertically-aligned polymer-stabilized liquid crystal film with a photoconductive layer," Opt. Express 17, 22386-22392 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-25-22386


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References

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