Space-frequency domain gradient metamaterial and design method thereof

Abstract

The invention provides a space-frequency domain gradient metamaterial and a design method thereof. The design method comprises the steps of: firstly, calculating a spatial gradient and a frequency gradient of the space-frequency domain gradient metamaterial in an operating frequency band according to specific functional requirements; secondly, determining a reference unit and carrying out simulation to obtain a phase response curve thereof; sequentially superimposing the one-dimensional spatial gradient and the frequency gradient to a phase curve of the reference unit to obtain a group of phase curve set satisfying requirements; and sequentially superimposing the spatial gradient and the frequency gradient in an orthogonal direction to each phase curve again when in need, and finally carrying out simulation to obtain a one-dimensional or two-dimensional metamaterial unit group. The space-frequency domain gradient metamaterial with the phase gradient changing with frequency is obtainedthrough combining the spatial gradient and the frequency gradient, continuous free regulation and control of electromagnetic waves can be realized, and various functions in the operating frequency band can be realized, for example, flexible scanning of the electromagnetic waves in one-dimensional and two-dimensional spaces in a passive situation and continuous transformation of vortex wave modes.

Description

technical field [0001] The invention belongs to the technical field of new artificial electromagnetic materials, and in particular relates to a metamaterial whose phase gradient varies with frequency and a design method thereof. Background technique [0002] New artificial electromagnetic materials, also known as electromagnetic metamaterials (Metamaterials), are a new type of artificial materials composed of periodic / non-periodic arrangements of basic units with specific geometric shapes. In the past 20 years, electromagnetic metamaterials have developed rapidly, resulting in many interesting physical phenomena such as negative reflection, negative refraction, and optical invisibility, etc., and have also been used to design new electromagnetic devices, such as digitally coded metamaterials, metamaterial lenses, Holographic metamaterials, etc. By modulating the subwavelength unit structure and its distribution, metamaterials have great flexibility in controlling electromag...

AI Technical Summary

Problems solved by technology

The surface phase distribution of metamaterials plays a key role in the realization of some interesting functions, and the existing theories usually focus on the distribution characteristics of metamaterial phases in space, and seldom study its frequency domain characteristics, so the current design freedom of metamaterials Not high enough to continuously and freely regulate electromagnetic waves

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