articleNature CommunicationsSep 30, 2019GOLD OA

Broadband transparent optical phase change materials for high-performance nonvolatile photonics

YZYifei ZhangJBJeffrey B. ChouJLJunying LiHLHuashan LiQDQingyang Du

Massachusetts Institute of Technology · MIT Lincoln Laboratory · +5 more institutions

PubMed
Indexed inarxivcrossrefdoajpubmed

Abstract

Abstract Optical phase change materials (O-PCMs), a unique group of materials featuring exceptional optical property contrast upon a solid-state phase transition, have found widespread adoption in photonic applications such as switches, routers and reconfigurable meta-optics. Current O-PCMs, such as Ge–Sb–Te (GST), exhibit large contrast of both refractive index (Δ n ) and optical loss (Δ k ), simultaneously. The coupling of both optical properties fundamentally limits the performance of many applications. Here we introduce a new class of O-PCMs based on Ge–Sb–Se–Te (GSST) which breaks this traditional coupling. The optimized alloy, Ge 2 Sb 2 Se 4 Te 1 , combines broadband transparency (1–18.5 μm), large…

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Authors

21
  • YZ
    Yifei ZhangCorresponding

    Massachusetts Institute of Technology

  • JB
    Jeffrey B. Chou

    MIT Lincoln Laboratory

  • JL
    Junying Li

    University of Shanghai for Science and Technology

  • HL
    Huashan Li

    Sun Yat-sen University

  • QD
    Qingyang Du

    Massachusetts Institute of Technology

Topics & keywords

Topics
Keywords
  • Broadband
  • Photonics
  • Optical transparency
  • Refractive index
  • Optical switch
  • Contrast ratio
  • Optical communication
  • High contrast
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