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1. (WO2013114742) VARIABLE OPTICAL ATTENUATOR

Pub. No.:    WO/2013/114742    International Application No.:    PCT/JP2012/082466
Publication Date: Fri Aug 09 01:59:59 CEST 2013 International Filing Date: Sat Dec 15 00:59:59 CET 2012
IPC: G02F 1/09
H01L 29/82
H01L 43/00
Applicants: FUJI ELECTRIC CO., LTD.
富士電機株式会社
Inventors: OGIMOTO, Yasushi
荻本 泰史
OOTO, Masanori
大登 正敬
Title: VARIABLE OPTICAL ATTENUATOR
Abstract:
Provided is a variable optical attenuator for which surface area can easily be increased, for which there is no need to apply an external field except when varying the transmittance, and which can operate at room temperature. In an embodiment of the present invention, there is provided a variable optical attenuator (100) provided with: a superlattice (2) in which La1-xSrxMnO3 films (21) (LSMO film, where 0.1 < x < 0.7) and transparent insulation films (22) are alternately laminated, the superlattice (2) being formed on a substrate in the (210) plane direction; and a magnetization control means (50) for controlling the magnetization of at least some of the LSMO films in the film plane. In the variable optical attenuator (100), the light transmittance of the superlattice (2) is controlled by the control of the magnetization of the LSMO films (21) of the superlattice (2) in the film plane by the magnetization control means (50).