Mid-infrared reconfigurable all-dielectric metasurface based on Ge2Sb2Se4Te1 phase-change material

Jinglin He; Zhuolin Shi; Sheng Ye; Minhua Li; Jianfeng Dong

doi:10.1364/OE.471193

Mid-infrared reconfigurable all-dielectric metasurface based on Ge₂Sb₂Se₄Te₁ phase-change material

Opt Express. 2022 Sep 12;30(19):34809-34823. doi: 10.1364/OE.471193.

Authors

Jinglin He, Zhuolin Shi, Sheng Ye, Minhua Li, Jianfeng Dong

PMID: 36242485
DOI: 10.1364/OE.471193

Abstract

In this paper, a reconfigurable all-dielectric metasurface based on Ge₂Sb₂Se₄Te₁ (GSST) phase-change material is proposed. By changing GSST from amorphous state to crystalline state, the metasurface can achieve high circular dichroism (CD) and wideband polarization conversion for circularly polarized waves in the mid-infrared (MIR) band. The maximum CD value reaches 0.95 at 74 THz, and circular polarization conversion efficiency is more than 90% in the wideband range of 41 THz - 48 THz. In addition, based on Pancharatnam-Berry phase, three kinds of wavefront manipulation of light have been realized: abnormal refraction, orbital angular momentum vortex beam and orbital angular momentum vortex beam splitting. This work has potential applications in the future MIR optical integrated system.