公开(公告)号：US20180143508A1

公开(公告)日：2018-05-24

申请号：US15570197

申请日：2016-04-18

Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE & TECHNOLOGY

Inventor： Hisato Uetsuka ,  Shu Namiki ,  Hitoshi Kawashima ,  Kazuhiro Ikeda

IPC: G02F1/31

CPC classification number: G02F1/31 ,  G02F1/13

Abstract: A conventional optical switching engine has difficulty in producing a universal multiport switching engine being capable of (i) programmatically changing regions to be switched, (ii) generating no wavelength dependent loss, (iii) having a small Walk-off, and (iv) being usable for small to large light beams. Produced is a light beam deflecting element in which a polarization grating is fitted in parallel on an N×M transmissive birefringence modulator formed such that a transmissive variable half-wavelength liquid crystal plate is divided into rectangular extreme small pixels, and many N and M pixels thus obtained are respectively arranged in X and Y axes directions in a matrix form, the polarization grating being a grating in which a period ∧ changes in an X′ axis direction (direction to which a birefringence axis rotates) in accordance with a wavelength width of light.