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13 May 2019 Reshaping light: reconfigurable photonics enabled by broadband low-loss optical phase change materials
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Abstract
Optical phase change materials (O-PCMs) are a unique class of materials which exhibit extraordinarily large optical property change (e.g. refractive index change > 1) when undergoing a solid-state phase transition. Traditional O-PCMs suffer from large optical losses even in their dielectric states, which fundamentally limits the performance of optical devices based on the materials. To resolve the issue, we have recently demonstrated a new O-PCM Ge-Sb-Se-Te (GSST) with broadband low loss characteristics. In this talk, we will review an array of reconfigurable photonic devices enabled by the low-loss O-PCM, including nonvolatile waveguide switches with unprecedented low-loss and high-contrast performance, free-space light modulators, bi-stable reconfigurable metasurfaces, and transient couplers facilitating waferscale device probing and characterizations.
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Yifei Zhang, Jeffrey B. Chou, Mikhail Shalaginov, Carlos Rios, Christopher Roberts, Paul Robinson, Bridget Bohlin, Qingyang Du, Qihang Zhang, Junying Li, Myungkoo Kang, Claudia Gonçalves, Kathleen Richardson, Tian Gu, Vladimir Liberman, and Juejun Hu "Reshaping light: reconfigurable photonics enabled by broadband low-loss optical phase change materials", Proc. SPIE 10982, Micro- and Nanotechnology Sensors, Systems, and Applications XI, 109820Q (13 May 2019); https://doi.org/10.1117/12.2513385
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