Oblique incidence metasurface stealth device of multi-layer frame structure based on achromatism

Abstract

The invention discloses an oblique incidence metasurface stealth device based on an achromatic multi-layer frame structure. The oblique incidence metasurface stealth device is composed of a frame area and a stealth layer. The frame area is a space formed by rhombic frames; the stealth layer comprises a first-layer metasurface, a second-layer metasurface and a third-layer metasurface from bottom to top; the first-layer metasurface is located on the left side of the rhombic frame and is tangent to the lower edge of the rhombic frame, the second-layer metasurface is located on the two sides of the rhombic frame and is tangent to the side edge of the rhombic frame, and the third-layer metasurface is located on the right side of the rhombic frame and is tangent to the upper edge of the rhombic frame; the unit structures are arranged on the stealth layer so that the phase gradient d phi / dx in the direction parallel to the stealth layer can be equal to linear dispersion d phi / df. The stealth metasurface has the advantages of being small in size and easy to machine, the design method and the stealth structure lay a foundation for development of the achromatic stealth metasurface, and the stealth effect of the stealth metasurface is improved. The method has good application prospects in the fields of radars, perfect lenses, illusion optics and the like.

Description

technical field [0001] The invention relates to the field of optics, in particular to an oblique incidence metasurface stealth device based on an achromatic multi-layer frame structure. [0002] technical background [0003] Metamaterials refer to periodic composite materials composed of subwavelength unit structures, which have special physical properties and extraordinary electromagnetic wave control capabilities. However, due to the limitation of the current manufacturing technology, the three-dimensional complex fabrication process limits the practical application of metamaterials. As two-dimensional metamaterials, metasurfaces have the advantages of simple structure and easy processing, and have attracted great attention of researchers since they were proposed. Metasurfaces have excellent control functions for electromagnetic waves, including the control of electromagnetic wave amplitude, phase, polarization direction, etc. Metasurfaces are widely used in physics, chem...

AI Technical Summary

Problems solved by technology

[0004] However, the current metasurface stealth design mainly focuses on single frequency or narrow band, which limits the use of metasurface stealth technology.

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