All-optical and polarization-independent spatial filter based on a vertically-aligned polymer-stabilized liquid crystal film with a photoconductive layer.
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/cm(2)) 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.
Huang
Chia-Yi
CY
Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan 701, Republic of China.
Ma
Jia-Ming
JM
Mo
Tin-Shan
TS
Lo
Kuo-Ching
KC
Lo
Kuang-Yao
KY
Lee
Chia-Rong
CR
D017076:Computer-Aided Design; D004553:Electric Conductivity; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D050866:Liquid Crystals / Q000737:chemistry*; D008567:Membranes, Artificial; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation
D008567:Membranes, Artificial