Design of a wide bandwidth achromatic metalens based on phase change material GST with aperture sharing
This paper proposes the use of aperture sharing synergistic operation in the structure of the metalens, together with the rational selection of the scattering unit size according to the linear relationship between the output phase and frequency of the scattering unit, and the selection of the slope...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
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EDP Sciences
2023-12-01
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| Series: | Xibei Gongye Daxue Xuebao |
| Subjects: | |
| Online Access: | https://www.jnwpu.org/articles/jnwpu/full_html/2023/06/jnwpu2023416p1229/jnwpu2023416p1229.html |
| _version_ | 1797289572911022080 |
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| author | LYU Shuyuan MENG Fei LUO Wenfeng BAI Yuchi WANG Rong |
| author_facet | LYU Shuyuan MENG Fei LUO Wenfeng BAI Yuchi WANG Rong |
| author_sort | LYU Shuyuan |
| collection | DOAJ |
| description | This paper proposes the use of aperture sharing synergistic operation in the structure of the metalens, together with the rational selection of the scattering unit size according to the linear relationship between the output phase and frequency of the scattering unit, and the selection of the slope of the phase variation with frequency, combined with the modulation of the phase change material Ge2Sb2Te5 crystallization rate m value, in the set wavelength band, for different wavelengths of incident light through the metasurface can produce a uniform phase distribution. The method is used to achieve a polarization-insensitive achromatic metalens in the 9.5-13 μm continuous wavelength band by adjusting the m value of the phase transition material Ge2Sb2Te5 crystallization rate and producing a phase distribution with a uniform focal length for different wavelengths of incident light passing through the metasurface. The simulation results show that the focal length of the achromatic metasurface varies by 3.57 μm in the working band, with an error of about 4.3% from the set focal length, and the full width of the half-peak of the focal point at all wavelengths of incidence reaches the diffraction limit, and the focusing efficiency exceeds 60%. The achromatic metalens proposed in this paper provides a new idea for the design of achromatic metasurfaces and promotes the research of phase change materials in broadband achromatic metasurfaces. |
| first_indexed | 2024-03-07T19:06:55Z |
| format | Article |
| id | doaj.art-0bdb609971ab4c208a0ad906af14d6c8 |
| institution | Directory Open Access Journal |
| issn | 1000-2758 2609-7125 |
| language | zho |
| last_indexed | 2024-03-07T19:06:55Z |
| publishDate | 2023-12-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Xibei Gongye Daxue Xuebao |
| spelling | doaj.art-0bdb609971ab4c208a0ad906af14d6c82024-03-01T07:59:43ZzhoEDP SciencesXibei Gongye Daxue Xuebao1000-27582609-71252023-12-014161229123410.1051/jnwpu/20234161229jnwpu2023416p1229Design of a wide bandwidth achromatic metalens based on phase change material GST with aperture sharingLYU Shuyuan0MENG Fei1LUO Wenfeng2BAI Yuchi3WANG Rong4School of Electronic Engineering, Xi'an University of Posts & TelecommunicationsSchool of Electronic Engineering, Xi'an University of Posts & TelecommunicationsSchool of Electronic Engineering, Xi'an University of Posts & TelecommunicationsSchool of Electronic Engineering, Xi'an University of Posts & TelecommunicationsSchool of Electronic Engineering, Xi'an University of Posts & TelecommunicationsThis paper proposes the use of aperture sharing synergistic operation in the structure of the metalens, together with the rational selection of the scattering unit size according to the linear relationship between the output phase and frequency of the scattering unit, and the selection of the slope of the phase variation with frequency, combined with the modulation of the phase change material Ge2Sb2Te5 crystallization rate m value, in the set wavelength band, for different wavelengths of incident light through the metasurface can produce a uniform phase distribution. The method is used to achieve a polarization-insensitive achromatic metalens in the 9.5-13 μm continuous wavelength band by adjusting the m value of the phase transition material Ge2Sb2Te5 crystallization rate and producing a phase distribution with a uniform focal length for different wavelengths of incident light passing through the metasurface. The simulation results show that the focal length of the achromatic metasurface varies by 3.57 μm in the working band, with an error of about 4.3% from the set focal length, and the full width of the half-peak of the focal point at all wavelengths of incidence reaches the diffraction limit, and the focusing efficiency exceeds 60%. The achromatic metalens proposed in this paper provides a new idea for the design of achromatic metasurfaces and promotes the research of phase change materials in broadband achromatic metasurfaces.https://www.jnwpu.org/articles/jnwpu/full_html/2023/06/jnwpu2023416p1229/jnwpu2023416p1229.htmlachromatic metalensphase change materialscrystallization rateaperture sharing |
| spellingShingle | LYU Shuyuan MENG Fei LUO Wenfeng BAI Yuchi WANG Rong Design of a wide bandwidth achromatic metalens based on phase change material GST with aperture sharing Xibei Gongye Daxue Xuebao achromatic metalens phase change materials crystallization rate aperture sharing |
| title | Design of a wide bandwidth achromatic metalens based on phase change material GST with aperture sharing |
| title_full | Design of a wide bandwidth achromatic metalens based on phase change material GST with aperture sharing |
| title_fullStr | Design of a wide bandwidth achromatic metalens based on phase change material GST with aperture sharing |
| title_full_unstemmed | Design of a wide bandwidth achromatic metalens based on phase change material GST with aperture sharing |
| title_short | Design of a wide bandwidth achromatic metalens based on phase change material GST with aperture sharing |
| title_sort | design of a wide bandwidth achromatic metalens based on phase change material gst with aperture sharing |
| topic | achromatic metalens phase change materials crystallization rate aperture sharing |
| url | https://www.jnwpu.org/articles/jnwpu/full_html/2023/06/jnwpu2023416p1229/jnwpu2023416p1229.html |
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