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Terahertz wave absorber insensitive to incident angle and polarization

An incident angle, terahertz technology, applied in the field of terahertz absorbers, can solve the problems of difficult preparation, narrow incident angle, polarization sensitivity, etc., and achieve the effect of simple manufacturing process, solving processing technology, and solving technical bottlenecks

Active Publication Date: 2021-02-23
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a terahertz wave absorber that is insensitive to incident angle and polarization, which solves the disadvantages of existing terahertz wave absorbing materials such as complex structure, difficult preparation, sensitivity to polarization, and too narrow incident angle.

Method used

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  • Terahertz wave absorber insensitive to incident angle and polarization
  • Terahertz wave absorber insensitive to incident angle and polarization
  • Terahertz wave absorber insensitive to incident angle and polarization

Examples

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Embodiment 1

[0037] A terahertz wave absorber that is insensitive to incident angle and polarization, the terahertz wave absorber is composed of a metal base plate and a plurality of array units located on the metal base plate, each array unit is made of CTO ceramic particles and titanium Lithium Oxide (LiTiO 3 , referred to as LTO) resonant ring. The shape of the CTO ceramic particles is spherical, the LTO resonant ring is a ring, and the size of the CTO ceramic particles and the LTO ring are both um-level, wherein the diameter of the CTO ceramic particles in the array unit is 10um, and the width of the LTO resonant ring is 2um. The distance between two adjacent ceramic particles is 20um, and the LTO ceramic particles are glued and fixed on the upper surface of the metal base plate by epoxy resin, and the distance between them and the metal base plate is 8.5um.

[0038] The dispersion parameter of the CTO dielectric material is: ε 0 =190,ε ∞ =5.6, ω T=3.3THz, γ=0.8THz. Because the un...

Embodiment 2

[0043] The shape of the CTO ceramic particles is a cube with a side length of 3um. The LTO resonant ring is a rectangular ring with an outer side length of 5um and an inner side length of 4um. The distance between two adjacent ceramic particles is 20um. The LTO ceramic particles pass through the ring. Oxygen resin glue is pasted and fixed on the upper surface of the metal base plate, and the distance between the metal base plate and the metal base plate is 5um. The absorption rate curve of periodically arranged wave absorbers when the ideal electromagnetic wave is incident is as follows: Figure 8 shown. The side length of the CTO cube dielectric particles is 3um, and the peak value of the absorption rate moves to the low frequency, and the peak value decreases slightly, but the peak value of the absorption rate is always above 90%.

[0044] Since the medium of CTO is a high-dielectric particle, the high-dielectric particle can produce a resonant dielectric dispersion, and th...

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Abstract

The invention discloses a terahertz wave absorber insensitive to incident angle and polarization. The absorber comprises a metal bottom plate and array units symmetrically arranged on the metal bottomplate in an array mode, and each array unit comprises a ceramic particle and a resonant ring concentric with the ceramic particle. The terahertz wave absorber provided by the invention can achieve nearly 100% absorption of electromagnetic waves near 1.8 THz, realizes perfect absorption of the electromagnetic waves in the frequency band, and has the same absorption response curve under different polarization angles, so that the terahertz wave absorber has polarization insensitivity, the absorption performance of the electromagnetic waves is not influenced when the polarization angles are continuously changed, the preparation process is simple, and the defects that an existing terahertz wave band wave absorbing material is complex in structure, difficult to prepare, sensitive to polarization, too narrow in incident angle and the like can be overcome.

Description

technical field [0001] The present disclosure relates to a terahertz absorber which is insensitive to incident angle and polarization. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency range of 0.1-10THz, between microwaves and infrared light. Microwaves are electromagnetic waves with a frequency between 300MHz and 3000GH, and infrared electromagnetic waves refer to electromagnetic waves with a wavelength between 0.76 and 1000 μm. At present, the research of various absorbers mainly focuses on artificial metal periodic structures, such as SRR and metal wire composite materials and their derivative structures, using electric units composed of metal wires and magnetic units composed of SRRs. Terahertz waves are broadband, low-energy, and transient, which makes terahertz waves widely used in many fields. In addition, terahertz has also made significant developments in related fields such as semiconductor manufacturing and new superc...

Claims

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Application Information

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IPC IPC(8): H01Q17/00
CPCH01Q17/00
Inventor 刘凌云周梅琳付波徐劲霞张吴欣李志恒
Owner HUBEI UNIV OF TECH