Graphene-Enabled Tunable Phase Gradient Metasurface for Broadband Dispersion Manipulation of Terahertz Wave
With the increasing demand for the miniaturization and flexibility of optical devices, graphene-based metasurfaces have emerged as a promising ideal design platform for realizing planar and tunable electromagnetic or optical devices. In this paper, we propose a tunable metasurface with low-dispersio...
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MDPI AG
2023-10-01
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| Online Access: | https://www.mdpi.com/2072-666X/14/11/2006 |
| _version_ | 1827639308745441280 |
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| author | Yin Zhang Yijun Feng Junming Zhao |
| author_facet | Yin Zhang Yijun Feng Junming Zhao |
| author_sort | Yin Zhang |
| collection | DOAJ |
| description | With the increasing demand for the miniaturization and flexibility of optical devices, graphene-based metasurfaces have emerged as a promising ideal design platform for realizing planar and tunable electromagnetic or optical devices. In this paper, we propose a tunable metasurface with low-dispersion phase gradient characteristics that is composed of an array of double-layer graphene ribbons sandwiched with a thin insulating layer and a polymer substrate layer with a gold ground plane. As two typical proof-of-concept examples, metasurfaces act as a planar prism and a planar lens, respectively, and the corresponding performances of tunable broadband dispersion are demonstrated through full-wave simulation experiments. By changing the Fermi level of each graphene ribbon individually to introduce abrupt phase shifts along the metasurface, the broadband continuous dispersion effect of abnormal reflection and beam focusing is achieved within a terahertz (THz) frequency region from 3.0 THz to 4.0 THz, and the dispersion results can be freely regulated by reconfiguring the sequence of Fermi levels via the bias voltage. The presented graphene metasurface provides an avenue for the dispersion manipulation of a broadband terahertz wave and may have great prospects in the fields of optics, imaging, and wireless communication. |
| first_indexed | 2024-03-09T16:36:44Z |
| format | Article |
| id | doaj.art-e8f1fcadf01548e49b6b52080e45d93a |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-09T16:36:44Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-e8f1fcadf01548e49b6b52080e45d93a2023-11-24T14:56:11ZengMDPI AGMicromachines2072-666X2023-10-011411200610.3390/mi14112006Graphene-Enabled Tunable Phase Gradient Metasurface for Broadband Dispersion Manipulation of Terahertz WaveYin Zhang0Yijun Feng1Junming Zhao2School of Information Engineering, Nanjing University of Finance and Economics, Nanjing 210023, ChinaDepartment of Electronic Engineering, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, ChinaDepartment of Electronic Engineering, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, ChinaWith the increasing demand for the miniaturization and flexibility of optical devices, graphene-based metasurfaces have emerged as a promising ideal design platform for realizing planar and tunable electromagnetic or optical devices. In this paper, we propose a tunable metasurface with low-dispersion phase gradient characteristics that is composed of an array of double-layer graphene ribbons sandwiched with a thin insulating layer and a polymer substrate layer with a gold ground plane. As two typical proof-of-concept examples, metasurfaces act as a planar prism and a planar lens, respectively, and the corresponding performances of tunable broadband dispersion are demonstrated through full-wave simulation experiments. By changing the Fermi level of each graphene ribbon individually to introduce abrupt phase shifts along the metasurface, the broadband continuous dispersion effect of abnormal reflection and beam focusing is achieved within a terahertz (THz) frequency region from 3.0 THz to 4.0 THz, and the dispersion results can be freely regulated by reconfiguring the sequence of Fermi levels via the bias voltage. The presented graphene metasurface provides an avenue for the dispersion manipulation of a broadband terahertz wave and may have great prospects in the fields of optics, imaging, and wireless communication.https://www.mdpi.com/2072-666X/14/11/2006graphene metasurfacebroadband dispersionphase gradientabnormal reflectionbeam focusing |
| spellingShingle | Yin Zhang Yijun Feng Junming Zhao Graphene-Enabled Tunable Phase Gradient Metasurface for Broadband Dispersion Manipulation of Terahertz Wave Micromachines graphene metasurface broadband dispersion phase gradient abnormal reflection beam focusing |
| title | Graphene-Enabled Tunable Phase Gradient Metasurface for Broadband Dispersion Manipulation of Terahertz Wave |
| title_full | Graphene-Enabled Tunable Phase Gradient Metasurface for Broadband Dispersion Manipulation of Terahertz Wave |
| title_fullStr | Graphene-Enabled Tunable Phase Gradient Metasurface for Broadband Dispersion Manipulation of Terahertz Wave |
| title_full_unstemmed | Graphene-Enabled Tunable Phase Gradient Metasurface for Broadband Dispersion Manipulation of Terahertz Wave |
| title_short | Graphene-Enabled Tunable Phase Gradient Metasurface for Broadband Dispersion Manipulation of Terahertz Wave |
| title_sort | graphene enabled tunable phase gradient metasurface for broadband dispersion manipulation of terahertz wave |
| topic | graphene metasurface broadband dispersion phase gradient abnormal reflection beam focusing |
| url | https://www.mdpi.com/2072-666X/14/11/2006 |
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