Ultra-compact, self-holding asymmetric Mach-Zehnder interferometer switch using Ge2Sb2Te5 phase-change material

Takumi Moriyama, Daiki Tanaka, Paridhi Jain, Hitoshi Kawashima, Masashi Kuwahara, Xiaomin Wang, Hiroyuki Tsuda

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


An asymmetric Mach-Zehnder interferometer optical switch using phase-change material (PCM) is reported. In this switch, two Ge2Sb2Te5 thin films, each 1 μm in diameter, are deposited on a Si waveguide, and are used as phase shifters. The PCM can be reversibly switched between the amorphous and crystalline states. The difference in refractive index between the two states is very large, typically more than 2. Therefore, an optical switch using the PCM can be very small. The switching operation is successfully demonstrated by laser pulse irradiation. The maximum extinction ratio is 26.7 dB, and 2.2-nm peak wavelength shift is verified.

Original languageEnglish
Article number20140538
JournalIEICE Electronics Express
Issue number15
Publication statusPublished - 2014 Jul 11


  • Optical switch
  • Optical waveguide
  • Phase change material

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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