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

doi:10.1587/elex.11.20140538

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

Department of Electronics and Electrical Engineering

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

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 language	English
Article number	20140538
Journal	IEICE Electronics Express
Volume	11
Issue number	15
DOIs	https://doi.org/10.1587/elex.11.20140538
Publication status	Published - 2014 Jul 11

Keywords

Optical switch
Optical waveguide
Phase change material

ASJC Scopus subject areas

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

Access to Document

10.1587/elex.11.20140538

Cite this

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

abstract = "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.",

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AU - Moriyama, Takumi

AU - Tanaka, Daiki

AU - Jain, Paridhi

AU - Kawashima, Hitoshi

AU - Kuwahara, Masashi

AU - Wang, Xiaomin

AU - Tsuda, Hiroyuki

PY - 2014/7/11

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