Broadband High-Order OAM Reflective Metasurface With High Mode Purity Using Subwavelength Element and Circular Aperture

Akram, Zaid; Li, Xiuping; Aziz, Abdul; Yu, Li; Zhu, Hua; Xing, Jun; Li, Xiaoming

doi:10.1109/access.2019.2919779

Cited by 19 publications

(13 citation statements)

References 32 publications

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“…Actually, those shape‐dependent crosstalks in modulated OAM modes have been partially noticed in the previous works, [ 54,55 ] and the corresponding relations between the crosstalk and the rotational symmetry of the meta‐atoms have been understood as a general angular momentum conservation law. [ 56–58 ] However, an effective method to control and redistribute energy of these modes has not been well studied.…”

Section: Theoretical Design and Discussionmentioning

confidence: 99%

Manipulation of Orbital Angular Momentum Spectrum Using Shape‐Tailored Metasurfaces

Yang

Sun

Sha

2020

Advanced Optical Materials

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communication still suffers from some limitations including misalignment, mode crosstalk, large receiving aperture, and overquadratic power decay. [8,9] Thus, highpurity vortex beams carrying the OAM spectra [10-12] are always highly demanded in multimode hybrid communication as well as its applications including superresolution imaging, [13] optical tweezers, [14] and radar pulse. [15,16]. During the past two decades, enormous effective approaches have been reported to generate vortex beams, such as holographic plates, [17-19] spiral phase plates, [20,21] antenna arrays, [22,23] as well as metasurfaces. [24-32] In addition, Pancharatnam-Berry (PB)-based metasurfaces were recently reported as a promising approach to fabricate ultrathin and high-efficiency OAM generators, [33-40] some of which can also generate high-performance and broadband vortex beams. [41-43] Nevertheless, most metasurfaces were designed by simply manipulating the phase profiles or distributions of incident waves to generated OAM beams, leaving the OAM spectra not rich and hard to be manipulated. Moreover, all of the metasurfaces mentioned above were constructed as square or disk-shaped geometries, which is not to be an optimum choice for multimode OAM generation. More recently, the highdimensional OAM spectrum, especially if the OAM spectrum is tailorable, has attracted considerable attention. [44-49] Specifically, both the quadratic phase plates and the pinhole plates were theoretically demonstrated to generate vortex beams with a comblike OAM spectrum. [46] Nonetheless, an approach that has both a deep physical understanding and a universal engineering technique to manipulate the OAM spectrum in wide bandwidth has not been explored yet. In this work, we propose a shape-tailored metasurface based on the triangular-lattice arrangement to generate the vortex beam with a high-performance and controlled OAM spectrum. First, we analyze the influence of lattice topology on the PB phase when meta-atoms are rotated. Compared with the square lattice, the triangular lattice presents a smaller coupling distortion and can be used to fabricate a broadband metasurface with higher performance. Inspired by the envelope modulation theory in the communication system, we establish a universal modulation relation between the shape of metasurfaces and the corresponding OAM spectra of generated vortex beams. Then, the shape-tailored metasurface is proposed, which can generate Vortex beams carrying orbital angular momentum (OAM) are widely applied in various electromagnetic, optical, and quantum systems. A tailored OAM spectrum composed of several specific modes as expected holds a promise for expanding the degrees of freedom of the systems. However, such a broadband high-purity tailored spectrum is difficult to be achieved by the present devices, where the broadband amplitude manipulation is not explored yet. In this work, inspired by the envelope-modulation theory, an elegant and universal way to manipulate the OAM spectrum in wide bandwidth is proposed by using...

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Section: Theoretical Design and Discussionmentioning

confidence: 99%

Manipulation of Orbital Angular Momentum Spectrum Using Shape‐Tailored Metasurfaces

Yang

Sun

Sha

2020

Advanced Optical Materials

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“…Generally, the electromagnetic properties of the metasurface are determined by the performances of unit cells [111]. To design broadband metasurface, the unit cells should obtain wideband characteristics [112][113][114][115]. For example, dual layers with orthogonal structure and five symmetric parallel dipoles, as illustrated in Figure 13(b), were adapted to stimulate multiple independent operating modes [116].…”

Section: Multiple Modes or Reconfigurationmentioning

confidence: 99%

Recent progress on RF orbital angular momentum antennas

Guo

Yang

et al. 2020

Journal of Electromagnetic Waves and Applications

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In the last five years or so, there has been a great interest in RF OAM to address the contradiction between the lack of wireless spectrum resources and the continually growing demands of the bandwidth. Recent developments and technological advancements in antenna design, material science, and integrated circuits have enabled miniaturized, multiple modes, tunable in radio frequency (RF) orbital angular momentum (OAM) antenna designs. From conventional methods such as spiral phase plate and reflector antenna to antenna array and metasurface, the working principle and structures are introduced. To improve the performance of RF OAM antennas, several innovative physical concepts, including multiple-input multiple-output, circular polarization rotation, PIN diodes dynamic regulation, and so on have been explored for the designs of RF OAM antenna designs. In this paper, we present an up-to-date survey on the development of RF OAM antenna technologies. We provide details on structure designs and theoretical analyses. The evaluate method and advantage analyses are also included. Open issues and development trends are explored as a source of inspiration towards the future better outcome of RF OAM antenna designs.

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“…This is because that the original Chebyshev array is a square aperture array, but by cutting out the four elements in the corner of the array, the antenna array itself becomes closer to a circular aperture array. Compared with the square aperture circular array, a circular aperture array can generate more symmetrical vortex beam and higher OAM mode purity [26]. It can be seen that when the radiation elements in the four corners of the square array are removed, the chamfer array is more beneficial to the symmetrical cone vortex beam generation and has good sidelobe performance.…”

Section: A Antenna Array Designmentioning

confidence: 99%

Synthesis and Measurement of a Circular-Polarized Deflection OAM Vortex Beam With Sidelobe Suppression Array

et al. 2020

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In this paper, a chamfer distribution antenna array is designed to generate a deflecting circular-polarized vortex beam carrying orbital angular momentum (OAM) mode. When the vortex beam is designed with a deflection angle, the sidelobe of the vortex beam will deteriorate. In order to solve this problem, an optimized array design is presented in this paper. Inspired by the Chebyshev distribution array synthesis method, the antenna elements in the four corners of the antenna array are cut out to realize the chamfer distribution array. Therefore, the sidelobe level of the deflected vortex beam can be effectively suppressed. Moreover, a simplified feeding network is designed to reduce the feeding network complexity by using circularly polarized structural center antenna element. The designed antenna array is simulated, fabricated, and measured at center frequency of 4.25 GHz in C-band. The far-field radiation pattern of the deflected vortex beam and the near E-field OAM vortex beam distribution are simulated and measured to verify the effectiveness of the proposed design method for sidelobe suppression array. INDEX TERMS Chebyshev array synthesis, chamfer antenna array, orbital angular momentum (OAM), sidelobe suppression, circular-polarized vortex beam.

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Broadband High-Order OAM Reflective Metasurface With High Mode Purity Using Subwavelength Element and Circular Aperture

Cited by 19 publications

References 32 publications

Manipulation of Orbital Angular Momentum Spectrum Using Shape‐Tailored Metasurfaces

Manipulation of Orbital Angular Momentum Spectrum Using Shape‐Tailored Metasurfaces

Recent progress on RF orbital angular momentum antennas

Synthesis and Measurement of a Circular-Polarized Deflection OAM Vortex Beam With Sidelobe Suppression Array

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