Generation of complicated millimeter-wave beams based on a wideband high-transmission polarization-independent complex-amplitude metasurface.
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TL;DR: In this article , a high-transmission polarization-independent complex amplitude modulation metasurface (CAMM) was proposed to generate complicated millimeter-wave beams like holographic imaging beam, Airy beam, and vortex knot beam.
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Abstract: Complex amplitude modulation metasurfaces (CAMM) that can independently control both amplitude and phase have fostered a broad research interest worldwide due to its more robust wave manipulation capability than metasurfaces that can only adjust phase. Although many CAMM structures have been reported, they still suffer from limitations such as low transmittance, complicated structure, polarization dependence, high cost, and difficulty in fabrication. This work proposes a high-transmission polarization-independent CAMM operating in an ultra-wide millimeter-wave frequency range from 30 to 50 GHz realized by cost-effective and easily implementable manners. Three CAMMs are designed to generate complicated millimeter-wave beams like holographic imaging beam, Airy beam, and vortex knot beam. The presented simulation and experimental results clearly demonstrate the effectiveness of the CAMMs. This work presents a new paradigm for CAMM that can be readily extended to other frequency bands. It may also advance further applications of millimeter-wave beams in communication, imaging and detection.
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Citations
Generation of broadband non-diffraction millimeter-wave airy beams based on high-efficiency tri-layer metasurfaces
TL;DR: In this article , a broadband 1-D and 2-D Airy beam generators utilizing high-efficiency tri-layer metasurfaces operating from 55 to 67 GHz are presented, which can achieve complete amplitude modulation from 1% to 98% and binary phase tuning of 0 and π.
Facile Fabrication of THz Metasurfaces by a Spatially Shaped Femtosecond Laser Printing System
Xiaohan Yu,Jing Qian,Dan Rao,Jianghang Wu,Dingyi Yang,Dongfeng Qi,Guande Wang,Le Liu,Xiaofei Zang,Jiaguang Han,Quanzhong Zhao +10 more
TL;DR: Researchers developed a femtosecond laser printing system to fabricate THz metasurfaces with high precision and versatility, enabling the creation of complex THz wavefronts and devices such as metalenses and holographic plates with outstanding performance.
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Broadband orbital angular momentum beam generation based on polarization-insensitive reflect array
Zhengping Zhang,Xiong Wang +1 more
TL;DR: In this article , a broadband polarization-insensitive millimeter-wave OAM generator based on high-refractive-index brick-shaped dielectric resonators was proposed.
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