Metamaterial-based terahertz adjustable polarized wave insensitive electromagnetically-induced transparency device

An electromagnetically induced transparent, terahertz technology, applied in electrical components, antennas, etc., can solve the problems of complex structure and less structure, and achieve the effect of simple structure pattern and easy preparation

Inactive Publication Date: 2018-08-10
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
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Problems solved by technology

[0009] The present invention aims at the existing terahertz frequency band adjustable polarization insensitive electromagnetically induced transparent structure device with less structure and complex structure, and generally only exists electromagnetically induced transparency phenomenon in one polarization mode, or when different polarized waves are

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  • Metamaterial-based terahertz adjustable polarized wave insensitive electromagnetically-induced transparency device

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Embodiment Construction

[0041] Two implementation methods of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] The present invention is a terahertz adjustable polarization-insensitive electromagnetically induced transparent device based on metamaterials. The electromagnetically induced transparent device is a periodic structure, including several basic units periodically arranged in the same direction on the xy plane; Figure 1a As shown, each basic unit structure is the same, including the graphene layer 1 on the upper layer and the dielectric layer 2 on the lower layer.

[0043] The model period in this example is P=6.25um. The dielectric layer is silicon dioxide with a dielectric constant of 4.41, a loss tangent of 0.0004, and a thickness of t=50um. The parameters of graphene are selected as: Fermi level E F =0.9eV, T=300K, Г=2.4THz, graphene thickness h 1 = 0.34nm. The selected values ​​of other parameters are s 1 = 2.2um, s 2 =0....

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Abstract

The invention discloses a metamaterial-based terahertz adjustable polarized wave insensitive electromagnetically-induced transparency device, and belongs to the fields of electromagnetic wave detection and sensor. The electromagnetically-induced transparency device comprises multiple basic units periodically arranged in the same direction; each basic unit comprises an upper layer graphene layer and a lower layer dielectric layer, and the dielectric layer is fixed on a substrate device; graphene is cut to form graphene square rings with openings in the adjacent edges; after the graphene layer is completely cut in one time, the middle part of the substrate device is hollow out; and finally, electroplating of a layer of conductive adhesive is carried out. The electromagnetically-induced transparency device has the same electromagnetically-induced transparency phenomenon on line polarized light in the x and y directions; when the polarized mode of incident wave is changed, device replacement is not needed; and in addition, an adjustable electromagnetically-induced transparency phenomenon can be realized by regulating the externally applied voltage without changing the device structure,thereby achieving important guidance significance and reference value on the development of an adjustable terahertz functional device.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave detection and sensor devices, in particular to a metamaterial-based terahertz adjustable polarization wave insensitive electromagnetically induced transparent device. Background technique [0002] Electromagnetically-induced Transparency (EIT) is a very important phenomenon in atomic physics. Its essence is that under resonance conditions, when the frequency of light matches the corresponding atomic transition frequency, the excitation of light atoms between channels Quantum destructive coherence makes the medium produce a very narrow transmission peak in a wide absorption band. Electromagnetically induced transparent devices can change the dispersion properties and slow down the speed of light, and have important applications in nonlinear devices, slow light devices, filters, sensors, and optical storage. [0003] Terahertz (THz) waves usually refer to electromagnetic waves with a frequency o...

Claims

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Application Information

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IPC IPC(8): H01Q15/00
Inventor 亓丽梅陈智娇刘畅姚远俞俊生
Owner BEIJING UNIV OF POSTS & TELECOMM
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