基于具有光电导层的垂直排列聚合物稳定液晶膜的全光且偏振无关的空间滤波器。

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

作者信息

Huang Chia-Yi, Ma Jia-Ming, Mo Tin-Shan, Lo Kuo-Ching, Lo Kuang-Yao, Lee Chia-Rong

机构信息

Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan 701, Republic of China.

出版信息

Opt Express. 2009 Dec 7;17(25):22386-92. doi: 10.1364/OE.17.022386.

DOI:10.1364/OE.17.022386

PMID:20052162

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.

摘要

在具有光电导（PC）层的垂直排列（VA）聚合物稳定液晶（PSLC）薄膜中开发了一种全光且与偏振无关的空间滤波器。这种空间滤波器基于光对PC层电导率的影响：高强度（低强度）光使PC层的电导率高（低），导致涂覆PC的VA PSLC单元的阈值电压低（高）。实验结果表明，这种空间滤波器在光学傅里叶变换系统中是一种光功耗低（约1.11 mW/cm²）的高通滤波器。通过模拟证实了其高通特性。因此，这种全光且与偏振无关的空间滤波器可用于增强图像的边缘。