期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-12196-4
关键词
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资金
- Assistant Secretary of Defense for Research and Engineering under Air Force [FA870215-D-0001, FA8721-05-C-0002]
- Defense Advanced Research Projects Agency through the Defense Sciences Office (DSO) Program EXTREME Optics and Imaging (EXTREME) [HR00111720029]
- Shanghai Sailing Program [19YF 1435400]
- National Natural Science Foundation of China [11804403]
- Natural Science Foundation of Guangdong Province [2018B030306036]
- [D18AP00070]
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 (Delta n) and optical loss (Delta 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, Ge2Sb2-Se4Te1, combines broadband transparency (1-18.5 mu m), large optical contrast (Delta n = 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.
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