Switching-controllable THz wave metamaterial perfect absorber and control method thereof

A technology of terahertz wave ultra-absorber, which is applied in waveguide devices, instruments, optics, etc., can solve the problems such as inability to adjust the absorption rate, and achieve various control methods, simple production methods, and various controllable room temperature effects

Inactive Publication Date: 2013-08-14
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the defects of the prior art, the purpose of the present invention is to provide a switch-controllable terahertz wave metamaterial perfect absorber, aiming to solve the problem that the existing absorber cannot adjust its absorption rate

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  • Switching-controllable THz wave metamaterial perfect absorber and control method thereof
  • Switching-controllable THz wave metamaterial perfect absorber and control method thereof
  • Switching-controllable THz wave metamaterial perfect absorber and control method thereof

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] MPA is an absorber based on MMs. It is difficult to find materials with an absorption rate close to 100% in nature, so MPA is particularly important. By designing the structural parameters of MPA and selecting appropriate materials, the impedance of MPA can be matched with the outside world, so that the reflectivity R is 0; at the same time, because the device part is made of opaque metal material, the transmittance T of MPA is also 0. According to the calculation formula of absorption rate A=1-T-R, the absorption rate A can reach 100%, achieving complete (beautiful) absorption.

[0030] T...

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Abstract

The invention relates to the field of metamaterial devices and provides a switching-controllable THz wave metamaterial perfect absorber (MPA) and a control method thereof. The switching-controllable THz wave metamaterial perfect absorber comprises a substrate, an MIT (metal-insulator transition) layer positioned on the substrate, a dielectric layer positioned on the MIT phase change layer and metal opening resonance units positioned on the dielectric layer and being in cyclic arrangement, and the on/off of the absorber at the resonance frequencies of the metal opening resonance units is realized through changing the conductivity of the MIT phase change layer. According to the invention, the variation of the conductivities of the MIT phase-change material before and after phase change is utilized to change the absorptivity of the absorber, so that the THz MPA can be turned on/off near the resonance frequency of the metal opening resonance units, initiative control of the electromagnetic transfer characteristics of THz wave bands at the specific frequency, and accordingly, a larger on-off ratio or modulation depth can be obtained; and the switching-controllable MPA adopting the substrate-vanadium dioxide-dielectric layer-SRRs (Split Ring Resonators) four-layer structure can control the conductivity of vanadium dioxide through an external field so as to control the absorptivity of the MPA.

Description

technical field [0001] The invention belongs to the field of metamaterial devices, and more specifically relates to a switch-controllable terahertz wave metamaterial perfect absorber and a control method thereof. Background technique [0002] Terahertz (THz) waves are electromagnetic waves with a frequency ranging from 0.1 to 10 THz (wavelength of 3000 to 30 μm). They are located in the special position of electronics and in the transition from electronics to photonics. They have many superior characteristics. In national defense and military, Satellite communication, medical diagnosis, etc. have shown broad application potential. [0003] Metal-insulator transition (MIT) materials have the characteristics of changing the resistivity and crystal structure of the material under external field excitation conditions. It has a wide range of research and applications in the fields of optical switches and optical storage. [0004] Metamaterials (MMs) refer to a class of artifici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P11/00G02B5/00H01P1/20
Inventor 孟德佳陈长虹
Owner HUAZHONG UNIV OF SCI & TECH
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