A right-handed circularly polarized wave generated by a waveguide-fed holographic metasurface

Zhang, Chen; Deng, Li; Zhu, Jianfeng; Hong, Weijun; Wang, Hongjun; Zeng, Ting; Ren, Xiaokui; He, Xiaoyuan; Zhao, Zhentao; Li, Shufang; Chen, Xue

doi:10.1088/1361-6463/ab850f

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…Due to the fact that an interferogram is the interference result of a reference wave and an object wave, its pattern is closely related to the polarization, amplitude and wavefront of two waves. For the generation of a circularly polarized wave, we proposed a method [36] by superposing x-and y-polarized holograms independently. Combining this method and the phase profile of the quasi-non-diffractive vortex wave obtained from Equation (1), the analytical expression of a required object wave P CPBOAM can be expressed as follows:…”

Section: Design Principlementioning

confidence: 99%

Generation of Circularly Polarized Quasi-Non-Diffractive Vortex Wave via a Microwave Holographic Metasurface Integrated with a Monopole

et al. 2021

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In this paper, a novel method for generating a circularly polarized (CP) quasi-non-diffractive vortex wave carrying orbital angular momentum (OAM), based on the microwave holographic metasurface integrated with a monopole, is proposed. This method is the combination of the non-diffraction theory and the principle of waveguide-fed-based holography and is equivalent to a superposition of two scalar impedance modulation surfaces. To verify the proposed method, a holographic metasurface generating a left-handed circularly polarized (LHCP) quasi-non-diffractive vortex wave carrying −1 mode OAM at the normal direction, was simulated and analyzed. The metasurface consisted of inhomogeneous slot units on a grounded substrate and a monopole excitation. Moreover, the location distribution of slots was determined by a computed interferogram between the reference wave and the object wave with the non-diffractive feature. Compared with an ordinary vortex wave, the quasi-non-diffractive wave obtained by our proposed method possessed a smaller divergence radius and a stronger electric field strength in the 9 times wavelength range. It paved a new path for manipulating the non-diffractive vortex wave in medium distance without using an external feeding source, which holds great potential for the miniaturization devices applied in medium-distance high-capacity secure communication, high-resolution imaging and intelligent detection.

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Section: Design Principlementioning

confidence: 99%

Generation of Circularly Polarized Quasi-Non-Diffractive Vortex Wave via a Microwave Holographic Metasurface Integrated with a Monopole

et al. 2021

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“…Compared with features such as frequency [12,13], intensity [14,15], direction [16], and spin angular momentum [17], the utilization of polarization state has been proved to be a popular method. Under different incident polarization states, a rich number of multi-functional devices were delicately designed, such as beam splitters [18,19], chiral structures [20,21], antenna [22], holographic devices [23,24]. On the other hand, intensity-dependent multi-functional devices also attract more and more attention since the beginning of this century [25].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic and nonlinear metasurface for multiple functions

Luo

Ren

Wang

et al. 2021

Sci. China Inf. Sci.

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We present a novel anisotropic and nonlinear metasurface integrated with multiple functions of diffuse scattering, beam splitting, and normal reflection, which can be switched in real time by tuning the polarization state or power level of the incident microwave. The key lies in the two judiciously designed anisotropic nonlinear particles in subwavelength scales that possess opposite reflection phases under one polarization and the same nonlinear power-dependent reflection phases under the orthogonal polarization. These properties are demonstrated comprehensively via comparisons between their reflection responses, receiving abilities, and nonlinear circuitry behaviors. In addition, both the spatial arrangement and the electrically enabling strategy of the particles are underpinned to pursue the proposed functions, which are verified through numerical simulations and measurements. When the metasurface is illuminated by plane waves coming from the direction perpendicular to it, a significant beam splitting effect is achieved with strong x-polarized incidence, which is switched to a specular reflection when the incoming power decreases. Under y-polarization, a diffuse scattering phenomenon is obtained, which is not dependent on the incident intensity. The study is expected to offer new solutions to many electromagnetic scenarios involving energy transmissions and protections.

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