Open AccessTunable wave plates based on phase-change metasurfaces
Author(s) -
Dong-Qin Zhang,
Fangjie Shu,
Zhiwei Jiao,
HongWei Wu
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.418360
Subject(s) - nanopillar , optics , materials science , wavelength , waveplate , polarization (electrochemistry) , phase change , optoelectronics , circular polarization , polarizer , metamaterial , phase (matter) , physics , laser , nanotechnology , birefringence , chemistry , engineering physics , quantum mechanics , nanostructure , microstrip
Wave plates based on metasurfaces have attracted intensive attention over the past decade owing to their compactness and design flexibility. Although various wave plates have been designed, their working wavelengths are fixed once they are made. Here we present a study on tunable wave plates based on phase-change metasurfaces made of Ge 2 Sb 2 Te 5 nanopillar structures. The Ge 2 Sb 2 Te 5 nanopillars can work as a high-efficiency transmissive half- or quarter-wave plate depending on their structural parameters. The working wavelength of wave plate can be tuned via the phase transition of Ge 2 Sb 2 Te 5 . Moreover, the polarization state of the transmitted light at a fixed wavelength can be modified by changing the crystallinity of Ge 2 Sb 2 Te 5 . The features suggest that tunable wave plates may have applications in optical modulators, molecular detection, and polarimetric imaging.