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Proceedings Paper

Optical switch driven by giant magnetostrictive thin films
Author(s): Sung W. Moon; Sang Ho Lim; Sang Bae Lee; HoKwan Kang; Min Chul Kim; Seok Hee Han; Myung-Hwan Oh
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Paper Abstract

Optical 1xN switches which can be operated by Giant Magnetostrictive Thin Film under the magnetic field are firstly investigated. Bulk micromachining and deposition of magnetostrictive thin film was used for fabrication of a 1xN cantilever-type optical switch. Optical switching operation induced by magnetostriction was examined through optical path modulation test. The optical path can be redirected and exactly positioned by wide reflection-angle change of light with cantilever deflection. Deflection of cantilever by magnetostriction was significantly improved in our developed Re-Fe thin film system. In this report, Giant magnetostrictive thin films of amorphous Tb-Fe and Sm-Fe based alloys exhibiting excellent magnetostrictive characteristics at low magnetic fields are developed from a systematic investigation with a particular emphasis being placed to examine B effects. Magnetostrictions of 173 ppm and -585 ppm are achieved in B containing Tb-Fe and Sm- Fe thin films, respectively, at a magnetic field of 100 Oe. Switching characteristics of our cantilever-type optical switch were evaluated using optical fiber under laser-optic test system. Optical path change of 6 degree was achieved under stable switching operation and was considered to increase the number of communication channels for construction of fiber optical network application.

Paper Details

Date Published: 10 March 1999
PDF: 9 pages
Proc. SPIE 3680, Design, Test, and Microfabrication of MEMS and MOEMS, (10 March 1999); doi: 10.1117/12.341283
Show Author Affiliations
Sung W. Moon, Korea Institute of Science and Technology (South Korea)
Sang Ho Lim, Korea Institute of Science and Technology (South Korea)
Sang Bae Lee, Korea Institute of Science and Technology (South Korea)
HoKwan Kang, Korea Institute of Science and Technology (South Korea)
Min Chul Kim, Korea Institute of Science and Technology (South Korea)
Seok Hee Han, Korea Institute of Science and Technology (South Korea)
Myung-Hwan Oh, Korea Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 3680:
Design, Test, and Microfabrication of MEMS and MOEMS
Bernard Courtois; Wolfgang Ehrfeld; Selden B. Crary; Wolfgang Ehrfeld; Hiroyuki Fujita; Jean Michel Karam; Karen W. Markus, Editor(s)

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