Title:
CIRCULARLY-POLARIZED-LIGHT INPUT/OUTPUT DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/119362
Kind Code:
A1
Abstract:
[Problem] To provide a circularly-polarized-light input/output device that makes it possible to configure a compact, multi-input/multi-output light switch. [Solution] A circularly-polarized-light input/output device according to the present invention includes: a first polarization diffraction grating that diffracts, when circularly polarized light slanted at angles of +θ and -θ with respect to a thickness direction is incident thereon, the circularly polarized light in the thickness direction before outputting the circularly polarized light; a liquid-crystal polarization rotating element that outputs the circularly polarized light, incident from the first polarization diffraction grating in a direction parallel to the thickness direction, in either a state wherein the rotation direction thereof is reversed or a state wherein the rotation direction thereof is maintained, in the direction parallel to the thickness direction; a second polarization diffraction grating that diffracts the circularly polarized light, incident from the liquid-crystal polarization rotating element in the direction parallel to the thickness direction, in a direction inclined at an angle of either +θ or -θ with respect to the direction parallel to the thickness direction in accordance with the rotation direction before outputting the circularly polarized light; and a circularly-polarized-light irradiation unit that irradiates the first polarization diffraction grating with the circularly polarized light from the direction inclined at the angle of either +θ or -θ with respect to the direction parallel to the thickness direction.
Inventors:
UETSUKA HISATO (JP)
NAMIKI SHU (JP)
TSUDA HIROYUKI (JP)
NAMIKI SHU (JP)
TSUDA HIROYUKI (JP)
Application Number:
PCT/JP2016/088905
Publication Date:
July 13, 2017
Filing Date:
December 27, 2016
Export Citation:
Assignee:
NAT INST ADVANCED IND SCIENCE & TECH (JP)
UNIV KEIO (JP)
UNIV KEIO (JP)
International Classes:
G02F1/31; G02B5/18; G02B5/30; G02F1/13
Foreign References:
| US20040032660A1 | 2004-02-19 | |||
| US20120188467A1 | 2012-07-26 | |||
| US20110188120A1 | 2011-08-04 | |||
| JP2015505995A | 2015-02-26 | |||
| JPH08510564A | 1996-11-05 | |||
| JP2012530951A | 2012-12-06 |
Other References:
JIHWAN KIM ET AL.: "Demonstration of large-angle nonmechanical laser beam steering based on LC polymer polarization gratings", SPIE, vol. 8052, 13 May 2011 (2011-05-13), pages 1 - 12, XP060009801
Attorney, Agent or Firm:
SHIODA Shin (JP)
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