@inproceedings{b8a652c32a314b198699a78aa7437648,
title = "Phase-change metasurface for switchable waveplates",
abstract = "In this paper, a transmissive tunable metasurface based on phase-change alloy Ge2Sb2Te5 (GST) has been proposed, exhibiting the function of switching between a quarter wave plate (QWP) and a half wave plate (HWP) in mid-IR region, i.e., providing circular-to-linear and circular-to-circular polarization conversions at amorphous state and crystalline state, respectively. For the amorphous GST, linear polarized (LP) transmitted beams with angles of linear polarization (AoLPs) close to ±45° can be obtained with the degrees of linear polarization (DoLPs) close to 1 under normal circular polarized (CP) excitations at the wavelength varying from 4.8 to 5.2 μm. As for the crystalline GST, the normally incident CP lights can be converted into the corresponding orthogonal CP beams with the degrees of circular polarization (DoCPs) close to ±1 within the wavelength range from 4.95 to 5.05 μm. The polarization state diagrams of the transmitted beams with good profiles further prove the good performance of the designed GST metasurface. Our finding paves the way for the development of flat polarization optical components with switchable functionalities.",
keywords = "GST, Optical Metasurface, Switchable, Waveplates",
author = "Ziru Cai and Yingtao Ding and Zhiming Chen",
note = "Publisher Copyright: {\textcopyright} 2023 SPIE.; 2022 Applied Optics and Photonics China: Optoelectronics and Nanophotonics, AOPC 2022 ; Conference date: 18-12-2022 Through 19-12-2022",
year = "2023",
doi = "10.1117/12.2642578",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Buwen Cheng and Jin Guo and Sen Qian",
booktitle = "AOPC 2022",
address = "United States",
}