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Yue Z, Li JT, Li J, Zheng CL, Liu JY et al. Terahertz metasurface zone plates with arbitrary polarizations to a fixed polarization conversion. Opto-Electron Sci 1, 210014 (2022). doi: 10.29026/oes.2022.210014
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Original Article Open Access
Terahertz metasurface zone plates with arbitrary polarizations to a fixed polarization conversion
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Abstract
Metasurfaces that can realize the polarization manipulation of electromagnetic waves on the sub-wavelength scale have become an emerging research field. Here, a novel strategy of combining the metasurface and Fresnel zone plate to form a metasurface zone plate is proposed to realize the conversion from nearly arbitrary polarizations to a fixed polarization. Specifically, when one polarized wave is incident on adjacent ring zones constructed by different types of meta-atoms, the transmitted waves generated by odd-numbered and even-numbered ring zones converge at the same focus and superimpose to generate a fixed polarized wave. As function demonstrations, we have designed two types of metasurface zone plates: one is a focused linear polarizer, and the other can convert nearly arbitrary polarized waves into focused circularly polarized waves. The simulated and measured results are consistent with theoretical expectations, suggesting that the proposed concept is flexible and feasible. Our work provides an alternative platform for polarization manipulation and may vigorously promote the development of polarization photonic devices.-
Keywords:
- metasurface zone plates /
- polarization /
- conversion /
- terahertz
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References
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Supplementary information for Terahertz metasurface zone plates with arbitrary polarizations to a fixed polarization conversion 
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Yue Z, Li JT, Li J, Zheng CL, Liu JY et al. Terahertz metasurface zone plates with arbitrary polarizations to a fixed polarization conversion. Opto-Electron Sci 1, 210014 (2022). doi: 10.29026/oes.2022.210014
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Figure 1.
(a) Performing diagram of x-LP beam generator. (b) Schematic diagram of RCP beam generation under non-polarized incidence.
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Figure 2.
(a) Schematic diagram of the linear polarizer. (b) Simulated results on the xz plane under x-LP incidence. (c) The intensity distributions of the transmitted x-LP and y-LP components on the xz plane under y-LP illumination. (d) The intensity profiles of the orthogonal LP components of the outgoing wave at the focal plane, under different polarized incidences.
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Figure 3.
(a) SEM image of the sample. (b) The measured intensity profiles of x-LP and y-LP components on the focal plane, under the incidences of four polarized waves.
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Figure 4.
(a) Schematic of the Meta-atom 1. (b) Top view of the Meta-atom 2. (c) Transmission amplitudes of cross- and co-polarized components at different frequencies, under LCP incidence. (d) Simulated results of phase shifts under LCP incidence. (e) The relationship between the transmission amplitudes of the orthogonal CP components and the incident frequency, when the RCP wave is incident. (f) The phase shift of the transmitted LCP wave at different incident frequencies under RCP incidence.
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Figure 5.
(a) Schematic diagram of the structure of the metasurface zone plate. (b, c) The intensity distributions of the cross- and co-polarized components at the focal plane under CP incidences. (d) The simulated intensity distribution of the focal plane under LP and EP incidences.
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Figure 6.
(a) SEM image of the fabricated metasurface zone plate. (b) The measured intensity profiles of the focal plane under CP and LP incidences. The inset is the intensity distribution across the focus along the x-axis.
