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

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 (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 f

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC6768866 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature