Metasurface Avery Beam Generator and Design Method Based on Simultaneous Control of Amplitude and Phase

Abstract

The invention belongs to the technical field of metasurface electromagnetic control, in particular to a metasurface Avery beam generator based on amplitude and same simultaneous control and a design method thereof. The Airy beam generator of the present invention is a two-dimensional metasurface, composed of M*N with different structural parameters and different rotation angles Φ The metasurface units are arranged at equal intervals in the plane, including two kinds of three-layer sequential rotating split ring resonator units with different radii; the metasurface unit has the function of cross-polarization and high transmission amplitude and phase control, and its structure consists of the upper, The middle and lower three-layer metal structures and two-layer dielectric boards are alternately stacked. The beam generator of the present invention can generate one-dimensional, two-dimensional long-distance non-diffraction self-accelerating cross-linear polarization beams under the excitation of linear polarized plane waves, forming a parabolic transmission trajectory, and has the characteristics of lateral acceleration, self-healing and limited energy non-diffraction transmission. The Airy beam generator of the present invention has the advantages of ultra-thin volume, large non-diffraction transmission area, wide working frequency band, and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of metasurface electromagnetic regulation, and in particular relates to an arbitrary circularly polarized spin and wavefront controller based on the interference principle and a design method thereof. Background technique [0002] Metasurface, as a flat two-dimensional form of metamaterial, consists of a series of subwavelength artificial electromagnetic structures arranged in a certain way. Due to its thin thickness, simple fabrication and strong electromagnetic wave control ability, it has attracted the research interest of scientific and technical personnel. In particular, the application of metasurfaces to flexibly control the amplitude and phase of electromagnetic scattering or simultaneously control the amplitude and phase is widely used in modern microwave / optical communication systems. However, the functions realized by metasurfaces in the past are only based on phase modulation under specific polar...

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Problems solved by technology

[0003] However, it is very challenging to control the high transmission amplitude and phase at the same time in practice. This is because it is difficult to control the amplitude and phase of the unit independently in the traditional method. When the amplitude is changed, the phase will also change, or when the phase is changed, the amplitude will also change. , while the transmission amplitude is difficult to maintain at a high level

Therefore, it is difficult to achieve both amplitude and phase control on the caliber

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