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A Wideband Terahertz Transmissive Polarization Manipulator Based on Metasurfaces

1
School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
2
Beijing Key Laboratory for Microwave Sensing and Security Applications, Beihang University, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(10), 1068; https://doi.org/10.3390/electronics8101068
Received: 14 August 2019 / Revised: 14 September 2019 / Accepted: 18 September 2019 / Published: 20 September 2019
(This article belongs to the Special Issue Millimeter and Terahertz Wireless Communications)
Wideband and multifunction operation for THz polarization manipulating devices has been desired for a wide range of applications. In this paper, a novel wideband transmissive type polarization manipulator based on metasurfaces is proposed in the THz region. The designed metasurface acts as a multifunctional polarization manipulator, performing linear to circular polarization conversion (LCPC) for relative bandwidth 43.9% (0.94 THz to 1.47 THz) for incident x/y polarizations and a wideband bandpass filter with relative bandwidth 67% (0.713 THz to 1.4346 THz) for incident slant (xy) polarizations. Wideband LCPC operation is achieved using a unique diagonal symmetric structure based on a bilayered metasurface. In order to confirm the validation of proposed results, electromagnetic simulation was carried out in two industry-standard software packages, HFSS and CST, using frequency domain and time domain solvers, respectively. Close agreement between numerical results depicts the validity and reliability of the proposed design. Polarized wave trajectory, equivalent microscopic circuit, physical mechanisms, and impact of different geometrical parameters on the performance is investigated. To the best of our knowledge, this is the first polarization manipulator based on bilayered metasurfaces. The same structure can be used as for LCPC and the transmit reject filter for THz wireless communication, including THz satellite communications, the future of communication. Moreover, they can be used in THz imaging and biomolecular control devices. View Full-Text
Keywords: linear to circular polarization conversion; polarization manipulation; terahertz; receive filter linear to circular polarization conversion; polarization manipulation; terahertz; receive filter
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Fahad, A.K.; Ruan, C.; Chen, K. A Wideband Terahertz Transmissive Polarization Manipulator Based on Metasurfaces. Electronics 2019, 8, 1068.

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