Stealth method based on bendable disordered sub-wavelength inclined grating structure

A technology of inclined grating and grating structure is applied in the field of stealth, which can solve the problems of large stealth medium and the inability to bend and deform the stealth medium, and achieve the effects of low cost, suppressing the change of phase difference, and simple manufacturing method.

Active Publication Date: 2021-07-16
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the problem that ordinary broadband optical stealth requires a relatively large stealth medium, and the stealth medium

Method used

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  • Stealth method based on bendable disordered sub-wavelength inclined grating structure
  • Stealth method based on bendable disordered sub-wavelength inclined grating structure
  • Stealth method based on bendable disordered sub-wavelength inclined grating structure

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Embodiment Construction

[0026] The present invention discovers the broadband transmission characteristics of the disordered sub-wavelength inclined metal grating structure, and finds that electromagnetic waves can excite the surface plasmons of the metal grating, and the excited plasmons propagate along the slit and re-radiate electromagnetic waves without being affected by disorder. influence and is robust. The transmission of electromagnetic waves is only related to the metal surface, so solid objects that do not chemically react with the metal shell can be hidden inside each grating unit, achieving the effect of broadband stealth.

[0027] The embodiment discloses a stealth method based on a bendable disordered sub-wavelength tilted grating structure, which is applied to a powdery object to be hidden, and mainly includes the following steps:

[0028] Step 1. First, glue and fix the powdery object to be hidden on a cardboard as a carrier; the thickness of the cardboard is about 0.02-0.3 mm; the dia...

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Abstract

The invention discloses a stealth method based on a bendable disordered sub-wavelength inclined grating structure. The method comprises the steps of constructing a plurality of rectangular or strip-plate-shaped grating units, each grating unit comprises a to-be-stealthy object and a metal grating shell wrapping the to-be-stealthy object; the grating units are sequentially and obliquely arranged in the horizontal direction, and the two short edges of each grating unit are fixed through oppositely-arranged transparent flexible supporting pieces so as to form an inclined grating structure; and after terahertz wave band electromagnetic waves enter the grating structure, the surface of the metal grating shell is excited to generate plasmons, and the plasmons are propagated along a slit of the grating structure and converted into electromagnetic waves to be emitted, so that terahertz wave band broadband stealth of the to-be-stealthy object in the metal grating shell is achieved. The method is simple in implementation mode and low in manufacturing cost.

Description

technical field [0001] The invention belongs to the field of stealth technology, and in particular relates to a stealth method based on a bendable disordered sub-wavelength inclined grating structure. Background technique [0002] When electromagnetic waves are incident on the surface of an object, the object usually reflects or scatters part of the electromagnetic waves. These reflected or scattered electromagnetic waves can be detected by eyes or other detectors, so that the object is perceived to exist and cannot be hidden. In recent decades, optical stealth technology has attracted much attention and has made great progress. A series of methods have been developed to achieve optical stealth. The more famous optical stealth schemes include: stealth based on transformation optics, carpet stealth, plasma Stealth of polariton, cloaking of mantle, cloaking of transmission line network, cloaking of compensation medium, cloaking of optical frequency realized by calcite or polym...

Claims

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Application Information

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IPC IPC(8): G02B5/18
CPCG02B5/1819
Inventor 彭茹雯范仁浩刘冬王牧
Owner NANJING UNIV
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