Broadband transparent optical phase change materials for high-performance nonvolatile photonics
Author(s)Zhang, Yifei; Chou, Jeffrey B.; Li, Junying; Li, Huashan; Du, Qingyang; Yadav, Anupama; Zhou, Si; Shalaginov, Mikhail; Fang, Zhuoran; Zhong, Huikai; Roberts, Christopher; Robinson, Paul; Bohlin, Bridget; Ríos, Carlos; Lin, Hongtao; Kang, Myungkoo; Gu, Tian; Warner, Jamie; Liberman, Vladimir; Richardson, Kathleen; Hu, Juejun; ... Show more Show less
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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 (Δn) and optical loss (Δk), 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, Ge₂Sb₂Se₄Te₁, combines broadband transparency (1–18.5 μm), large optical contrast (Δn = 2.0), and significantly improved glass forming ability, enabling an entirely new range of infrared and thermal photonic devices. We further demonstrate nonvolatile integrated optical switches with record low loss and large contrast ratio and an electrically-addressed spatial light modulator pixel, thereby validating its promise as a material for scalable nonvolatile photonics.
DepartmentMassachusetts Institute of Technology. Materials Systems Laboratory; Massachusetts Institute of Technology. Microsystems Technology Laboratories; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Lincoln Laboratory; Massachusetts Institute of Technology. Materials Research Laboratory
Springer Science and Business Media LLC
Zhang, Yifei et al. "Broadband transparent optical phase change materials for high-performance nonvolatile photonics." Nature Communications 10, 1 (September 2019) 4279 © 2019, The Author(s).
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