Phase-change metasurface for switchable waveplates

Ziru Cai; Yingtao Ding; Zhiming Chen

doi:10.1117/12.2642578

23 January 2023 Phase-change metasurface for switchable waveplates

Ziru Cai, Yingtao Ding, Zhiming Chen

Proceedings Volume 12556, AOPC 2022: Optoelectronics and Nanophotonics; 1255604 (2023) https://doi.org/10.1117/12.2642578
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

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.

Citation Download Citation

Ziru Cai, Yingtao Ding, and Zhiming Chen "Phase-change metasurface for switchable waveplates", Proc. SPIE 12556, AOPC 2022: Optoelectronics and Nanophotonics, 1255604 (23 January 2023); https://doi.org/10.1117/12.2642578

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