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Material for realizing like-electromagnetic induction transparency effect and method

An electromagnetically induced transparency and realization technology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of low modulation speed, complex structure of graphene, difficult to manufacture, etc., to improve diversity and function, easy to manufacture and adjust , the effect of high modulation speed

Inactive Publication Date: 2019-02-26
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

However, most studies focus on adjusting the resonance frequency rather than the more important EIT-like resonance strength, or the resonance strength is changed but it shifts in the frequency spectrum, which makes it unsuitable for practical optical switches and other applications.
In addition, for modulators composed of large-area graphene, with relatively low modulation speed
Even though the low modulation speed can be overcome by designing discrete graphene composite structures as tunable elements or directly exciting plasmon resonances in graphene microstructures, discrete graphene structures are relatively complex and difficult to fabricate, which makes it out of the practical application

Method used

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  • Material for realizing like-electromagnetic induction transparency effect and method
  • Material for realizing like-electromagnetic induction transparency effect and method
  • Material for realizing like-electromagnetic induction transparency effect and method

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Embodiment Construction

[0030] The invention proposes an innovative method for dynamically adjusting the resonant strength of the transparent window produced by the similar electromagnetically induced transparency effect in the terahertz wave band. By integrating the single-layer graphene ribbon into the dark mode resonator, and then changing the Fermi level of graphene to realize the complete modulation of the resonance intensity of the electromagnetically induced transparency effect at a fixed resonance frequency. In addition, by calculating the group refractive index at different Fermi levels, it is concluded that the metamaterial has a very good slow light effect.

[0031] figure 1 (a) is the top view of the light and dark mode structure of the metamaterial, figure 1 (b) is a schematic diagram of the metamaterial structure. Hybrid metal graphene metamaterials are designed to control the resonance strength at EIT-like transparent windows. Its periodic structure is located on the substrate, and ...

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Abstract

The invention relates to a material for realizing a like-electromagnetic induction transparency effect and a method. The material comprises a substrate. A periodical structural unit is arranged on thesubstrate, and comprises opening square ring harmonic oscillators and tangential harmonic oscillators. The two types of harmonic oscillators are all made of a metal material. A single-layer graphenebelt is arranged between the opening square ring harmonic oscillators and the substrate and used for connecting all the opening square ring harmonic oscillators on the substrate. When a voltage is added across the upper side and the lower side of the material, the Fermi level of the single-layer graphene belt can be changed so as to change the conductivity of the graphene belt, the destructive interference phenomenon is generated between the opening square ring harmonic oscillators and the tangential harmonic oscillators when the Fermi level of the single-layer graphene belt is changed, and the like-electromagnetic induction transparency phenomenon is generated. By means of a modulating mechanism, the synchronous operations of all the units can be conveniently and rapidly realized; in addition, the material can be used for preparing optical switching devices, slow optical devices and other devices for optical communication networks.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a material and method for realizing an electromagnetically induced transparency effect. Background technique [0002] Electromagnetically induced transparency (EIT) describes an experimental phenomenon of sharp transmission windows produced in broad absorption curves, which is accompanied by changes in the dispersion properties of light and thus has many potential applications such as slow light, biochemical Sensing, filtering, optical switches, etc. This phenomenon, first discovered in experiments with three-level atomic systems, is caused by quantum destructive interference between two different excitation paths. However, compared with the EIT effect in the atomic system, because the experiment of the atomic system requires extremely harsh conditions, such as optical pumping and extreme low temperature, etc., it is the current research to use the advantages of flexible...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/00
CPCG02F1/0081
Inventor 韦中超劳朝德梁瑶瑶
Owner SOUTH CHINA NORMAL UNIVERSITY
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