公开(公告)号：EP1334403A1

公开(公告)日：2003-08-13

申请号：EP01990716.1

申请日：2001-11-19

Applicant: Agilent Technologies Inc.

Inventor： KRAKLK, John, C. ,  STONE, Michelle, M.

IPC: G02F1/1334 ,  G02F1/31

CPC classification number: G02F1/31 ,  G02F1/13342 ,  G02F2201/305

Abstract: A PDLC transmissive phase grating (1) utilizing nematic liquid crystal materials confined in a polymer matrix. The PDLC grating (1) operates in the Bragg regime and switches between diffracting and non-diffracting states via an applied electric field. The grating (1) is made up of a PDLC grating film (10) contained within a cell. The PDLC film (10) has a spatially periodic distribution of grating planes which includes polymer-rich regions (52) and liquid crystal-rich regions (54), wherein the major constituent of the polymer-rich regions (52) is a polymer, and wherein the liquid crystal constituent concentration within the liquid-rich regions (54) is greater than the liquid crystal constituent concentration within said polymer-rich regions (52). The PDLC transmission phase grating (1) is rendered substantially transparent when subjected to an electric field during the application of light that is p-polarized and incident on the grating at Bragg angle.