Optical switch driven by giant magnetostrictive thin films

S. Moon, S. H. Lim, S. B. Lee, H. K. Kang, M. C. Kim, S. H. Han, M. H. Oh

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


Optical 1×N 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 1×N 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° was achieved under stable switching operation and was considered to increase the number of communication channels for construction of fiber optical network application.

Original languageEnglish
Pages (from-to)854-862
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberII
Publication statusPublished - 1999
Externally publishedYes
EventProceedings of the 1999 Design, Test, and Microfabrication of MEMS and MOEMS - Paris
Duration: 1999 Mar 301999 Apr 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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