Yifei Zhang1 Jeffrey Chou2 Huashan Li1 Junying Li1 Qingyang Du1 Anupama Yadav3 Myungkoo Kang3 Zhuoran Fang1 Huikai Zhong1 Mikhail Shalaginov1 Tian Gu1 Jamie Warner4 Jeffrey Grossman1 Vladimir Liberman2 Kathleen Richardson3 Juejun Hu1

1, MIT, Cambridge, Massachusetts, United States
2, Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts, United States
3, University of Central Florida, Orlando, Florida, United States
4, University of Oxford, Oxford, , United Kingdom

Optical phase change materials (O-PCMs) are a unique class of materials which exhibit extraordinarily large optical property change (e.g. refractive index change Dn > 1) when undergoing a solid-state phase transition. These materials, exemplified by Mott insulators such as VO2 and chalcogenide compounds, have been exploited for a plethora of emerging applications including optical switching, photonic memories, reconfigurable metasurfaces, and non-volatile display. These traditional phase change materials, however, generally suffer from large optical losses even in their dielectric states, which fundamentally limits the performance of optical devices based on traditional O-PCMs. In this talk, we will discuss our progress in developing O-PCMs with unprecedented broadband low optical loss and their applications in novel photonic systems, such as high-contrast switches and routers towards a reconfigurable optical chip – the optical analog of electronic field-programmable gate arrays (FPGAs).