Design of broadband achromatic metasurface device based on phase-change material Ge2Sb2Te5

doi:10.1088/1674-1056/ac657a

中国物理B ›› 2022, Vol. 31 ›› Issue (12): 124206-124206.doi: 10.1088/1674-1056/ac657a

Design of broadband achromatic metasurface device based on phase-change material Ge₂Sb₂Te₅

Shuyuan Lv(吕淑媛)^†, Xinhui Li(李新慧), Wenfeng Luo(罗文峰), and Jie Jia(贾洁)

Xi'an University of Posts&Telecommunications, School of Electronic Engineering, Xi'an 710121, China

收稿日期:2021-12-10 修回日期:2022-04-06 接受日期:2022-04-08 出版日期:2022-11-11 发布日期:2022-11-11
通讯作者: Shuyuan Lv E-mail:1159955131@qq.com
基金资助:
Project supported by the Natural Science Foundation of Shaanxi Province, China (Grant No. 2021JM466).

Design of broadband achromatic metasurface device based on phase-change material Ge₂Sb₂Te₅

Shuyuan Lv(吕淑媛)^†, Xinhui Li(李新慧), Wenfeng Luo(罗文峰), and Jie Jia(贾洁)

Xi'an University of Posts&Telecommunications, School of Electronic Engineering, Xi'an 710121, China

Received:2021-12-10 Revised:2022-04-06 Accepted:2022-04-08 Online:2022-11-11 Published:2022-11-11
Contact: Shuyuan Lv E-mail:1159955131@qq.com
Supported by:
Project supported by the Natural Science Foundation of Shaanxi Province, China (Grant No. 2021JM466).

摘要/Abstract

摘要： Based on the phase-change material Ge₂Sb₂Te₅ (GST), achromatic metasurface optical device in the longer-infrared wavelength is designed. With the combination of the linear phase gradient GST nanopillar and the adjustment of the crystalline fraction m value of GST, the polarization insensitive achromic metalenses and beam deflector metasurface within the longer-infrared wavelength 9.5 μm to 13 μm are realized. The design results show that the achromatic metalenses can be focused on the same focal plane within the working waveband. The simulation calculation results show that the full-width at half-maximum (FWHM) of the focusing spot reaches the diffraction limit at each wavelength. In addition, the same method is also used to design a broadband achromatic beam deflector metasurface with the same deflection angle of 19°. The method proposed in this article not only provides new ideas for the design of achromatic metasurfaces, but also provides new possibilities for the integration of optical imaging, optical coding and other related optical systems.

关键词: metasurface, optical device, phase-change material, achromatic

Abstract: Based on the phase-change material Ge₂Sb₂Te₅ (GST), achromatic metasurface optical device in the longer-infrared wavelength is designed. With the combination of the linear phase gradient GST nanopillar and the adjustment of the crystalline fraction m value of GST, the polarization insensitive achromic metalenses and beam deflector metasurface within the longer-infrared wavelength 9.5 μm to 13 μm are realized. The design results show that the achromatic metalenses can be focused on the same focal plane within the working waveband. The simulation calculation results show that the full-width at half-maximum (FWHM) of the focusing spot reaches the diffraction limit at each wavelength. In addition, the same method is also used to design a broadband achromatic beam deflector metasurface with the same deflection angle of 19°. The method proposed in this article not only provides new ideas for the design of achromatic metasurfaces, but also provides new possibilities for the integration of optical imaging, optical coding and other related optical systems.

Key words: metasurface, optical device, phase-change material, achromatic

中图分类号: (Optical elements, devices, and systems)

42.79.-e

42.79.Bh (Lenses, prisms and mirrors) 42.79.Fm (Reflectors, beam splitters, and deflectors)

Shuyuan Lv(吕淑媛), Xinhui Li(李新慧), Wenfeng Luo(罗文峰), and Jie Jia(贾洁). Design of broadband achromatic metasurface device based on phase-change material Ge₂Sb₂Te₅[J]. 中国物理B, 2022, 31(12): 124206-124206.

Shuyuan Lv(吕淑媛), Xinhui Li(李新慧), Wenfeng Luo(罗文峰), and Jie Jia(贾洁). Design of broadband achromatic metasurface device based on phase-change material Ge₂Sb₂Te₅[J]. Chin. Phys. B, 2022, 31(12): 124206-124206.

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Design of broadband achromatic metasurface device based on phase-change material Ge₂Sb₂Te₅

Design of broadband achromatic metasurface device based on phase-change material Ge₂Sb₂Te₅

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