POLARIZATION CONVERSION ELEMENT

WIPO Patent Application WO/2011/105619

A1

Provided is a polarization conversion element capable of converting to radially polarized light linearly polarized light having a wavelength within a prescribed wavelength region. The polarization conversion element (1) has a phase reversal element (2) and a polarization plane rotation element (3). The polarization plane rotation element (3) has a liquid crystal layer (30), and two transparent electrodes (33, 34). The liquid crystal layer (30) has a plurality of areas (30a - 30h), with mutually different orientation directions, are arranged along a circumferential direction centered around the intersection point of the polarization plane rotation element (3) and the optical axis (OA). When a voltage corresponding to the wavelength of the linearly polarized light irradiated onto the polarization conversion element (1) is applied between the two transparent electrodes (33, 34), each area causes the polarization plane of the polarization component which was transmitted through each area to rotate so as to be in parallel with an emission direction centered at the intersection point with the optical axis, and the linearly polarized light is converted to radially polarized light thereby. Of a first and a second annular part arranged one after the other along an emission direction centered at the optical axis (OA), the phase reversal element (2) causes the phase of light irradiated onto the first annular part to be reversed with respect to the phase of the light irradiated onto the second annular part. The polarization conversion element can be used, for example, in light pickup devices, in laser equipment, and in laser microscopes.

JP2011197214	PROJECTOR
JP4663919	Substrate drying device
JP2021167001	LASER BEAM POSITION CONFIRMATION METHOD, WORK-PIECE PROCESSING METHOD, AND LASER PROCESSING DEVICE

HASHIMOTO NOBUYUKI (JP)
KURIHARA MAKOTO (JP)
MATSUMOTO KENJI (JP)
YOKOYAMA MASAFUMI (JP)
TANABE AYANO (JP)

PCT/JP2011/054820

September 01, 2011

February 24, 2011

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CITIZEN HOLDINGS CO LTD (JP)
HASHIMOTO NOBUYUKI (JP)
KURIHARA MAKOTO (JP)
MATSUMOTO KENJI (JP)
YOKOYAMA MASAFUMI (JP)
TANABE AYANO (JP)

G02F1/13; G02B5/30; G02F1/1335; G11B7/1369; G11B7/1392

JP2001159751A

2001-06-12

MAMORU HASHIMOTO ET AL.: "Beam Danmennai Henko Bunpu Seigyo to Kenbi Kansoku eno Oyo", OPTICAL ALLIANCE, vol. 20, no. 4, 1 April 2009 (2009-04-01), pages 21 - 25, XP008169104
ITARU NISHIYAMA ET AL.: "Ekisho Radial Henkoshi o Mochiita One Shot Fukukussetsu Keisoku", DAI 53 KAI EXTENDED ABSTRACTS, JAPAN SOCIETY OF APPLIED PHYSICS AND RELATED SOCIETIES, vol. 53, no. 3, 22 March 2006 (2006-03-22), pages 1067, XP008169056
See also references of EP 2541308A4
CHIN-CHERNG SUN; CHIN-KU LIU: "OPTICS LETTERS", vol. 28, 2003, OPTICAL SOCIETY OF AMERICA, article "Ultrasmall focusing spot with a long depth of focus based on polarization and phase modulation", pages: 99 - 101
HAIFENG WANG: "Creation of a needle of longitudinally polarized light in vacuum using binary optics", NATURE PHOTONICS, vol. 2, 2008, pages 501 - 505

AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)

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