title: All-optical and polarization-independent spatial filter based on a vertically-aligned polymer-stabilized liquid crystal film with a photoconductive layer.
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/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.
authors.affiliation: Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan 701, Republic of China.
authors.forename: Chia-Yi
authors.initials: CY
authors.lastname: Huang
authors.forename: Jia-Ming
authors.initials: JM
authors.lastname: Ma
authors.forename: Tin-Shan
authors.initials: TS
authors.lastname: Mo
authors.forename: Kuo-Ching
authors.initials: KC
authors.lastname: Lo
authors.forename: Kuang-Yao
authors.initials: KY
authors.lastname: Lo
authors.forename: Chia-Rong
authors.initials: CR
authors.lastname: Lee
mesh_terms: 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
chemical_list: D008567:Membranes, Artificial