期刊
COATINGS
卷 11, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/coatings11121499
关键词
nanophotonics; metasurface; phase-change materials; photonic switch
资金
- Chongqing Science Foundation for Distinguished Young Scholars [cstc2020jcyj-jqX0019]
- Provincial Natural Science Foundation of Guangdong
This paper presents a novel metasurface design for active phase tuning by integrating a phase-change dielectric into U-shaped meta-atoms, enabling switchable focusing in reflected waves with high contrast ratio. The hybrid design of the phase-change metasurface shows promising potential for compact integration of active photonic devices.
Currently, diverse metasurfaces act as exotic platforms enabling versatile wave regulations in deep-subwavelength level for ultracompact integration. To address the existing issues of passive nature and low-efficiency in wave controls, one type of metasurface for active phase tuning is proposed in this paper by integrating the phase-change dielectric of Ge2Sb2Te5 into the of U-shaped meta-atoms. Specifically, the phase-change-based hybrid design of Ge2Sb2Te5-integrated metalens switch is demonstrated and numerically confirmed with switchable focusing. The well-defined metal-insulator-metal (MIM) setup is used to enable high-efficiency reflective wavefront tunig and practical Ge2Sb2Te5 phase transition. Upon the phase transition between the amorphous and crystalline states of Ge2Sb2Te5, the cross-polarized component of reflected waves in the given wavelength range is switched on (maximized) for as-designed geometric phase plus meta-lensing or off (minimized) for no lensing with ultra-high contrast ratio of ~36:1. As a result, such hybrid design of phase-change metasurface may provide a promising route for active photonic device with compact integration.
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