Applied Physics B

, 97:749

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
  • C.-R. Lee
Rapid communication

DOI: 10.1007/s00340-009-3788-1

Cite this article as:
Huang, SY., Wung, TC., Fuh, A.YG. et al. Appl. Phys. B (2009) 97: 749. doi:10.1007/s00340-009-3788-1

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.

PACS

42.70.Df 42.70.Gi 42.79.Kr 42.79.Ci 

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • S.-Y. Huang
    • 1
    • 2
  • T.-C. Wung
    • 3
  • A. Y.-G. Fuh
    • 4
  • H.-C. Yeh
    • 3
  • C.-Y. Huang
    • 3
  • C.-M. Ma
    • 3
  • S.-C. Huang
    • 3
  • T.-S. Mo
    • 5
  • C.-R. Lee
    • 3
  1. 1.School of OptometryChung Shan Medical UniversityTaichungRepublic of China
  2. 2.Department of OphthalmologyChung Shan Medical University HospitalTaichungRepublic of China
  3. 3.Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic, Technology CenterNational Cheng Kung UniversityTainanRepublic of China
  4. 4.Department of Physics and Institute of Electro-optical Science and EngineeringNational Cheng Kung UniversityTainanRepublic of China
  5. 5.Department of Electronic EngineeringKun Shan University of TechnologyTainanRepublic of China

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