A bifunctional device for electromagnetically induced transparency and perfect absorption
An electromagnetically induced transparency and perfect absorption technology, applied in the direction of electrical components, antennas, etc., can solve the problems of reduced convenience and adaptability, and the inability to be dynamically tunable
Active Publication Date: 2022-07-29
GUILIN UNIV OF ELECTRONIC TECH
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However, both functions cannot be dynamically tunable, which reduces the convenience and adaptability in practical applications
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specific Embodiment
[0022] Specific embodiment: a dual-function device achieving electromagnetically induced transparency and perfect absorption, such as figure 1 and image 3 As shown, the device is an array structure, the unit structure is based on vanadium dioxide, silicon dioxide is the dielectric layer, graphene split rings and graphene strips are resonant structures, and the two have similar plasmonic resonance frequencies, and the incident electric field The direction is parallel to the long axis of the graphene strip.
[0023] like figure 2 As shown, the opening angle α of the graphene split ring is 90°, the outer diameter R=2.4 μm, and the width W 2 = 0.9 μm; graphene strip length l = 3 μm, width W 1 = 0.8 μm.
[0024] Preferably, the unit structure period is P=6 μm, the thickness of vanadium dioxide is 0.8 μm, and the thickness of silicon dioxide is 4 μm.
[0025] like Figure 4 and Figure 5 shown, when E F When increasing from 0.2eV to 0.5eV, the transmission peak is blue-sh...
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Abstract
The invention provides a dual-function device that realizes electromagnetically induced transparency and perfect absorption. The device is in an array structure on the plane where the basic unit structure is located. The axial direction is inserted into the graphene split ring 3 without contact with the inner side of the split ring. When the conductivity of vanadium dioxide is small and behaves as an insulator, the structure can realize the effect of electromagnetically induced transparency, and adjust the Fermi level of graphene and the conductivity of vanadium dioxide to realize the adjustment and modulation of the transparent window and group delay. ; When the conductivity of vanadium dioxide is increased to be metallic, the structure can realize the perfect absorption function of dual-band, and the absorption peak can be tuned by controlling the Fermi level of graphene. The present invention can be used for modulators, slow light devices, optical switches, perfect absorbers, etc. in integrated optical devices.
Description
technical field [0001] The invention relates to a dual-function device for realizing electromagnetically induced transparency and perfect absorption, which can be used for slow light effects, modulators, optical switches and perfect absorption, and belongs to the field of electromagnetically induced transparency and metamaterial wave absorbers. Background technique [0002] In recent years, metamaterials have attracted a lot of research interest due to their versatile properties and potential applications, such as perfect lenses, invisibility cloaks, perfect absorbers, etc. Graphene has attracted the attention of researchers due to its high current-carrying mobility, low transmission loss, and tunability by an applied voltage. Since the Fermi energy is changed by changing the bias voltage, graphene has greater potential for dynamic tuning compared to noble metals. Phase-change materials have interesting properties, such as the switchable phenomenon from dielectric to metal,...
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IPC IPC(8): H01Q15/00H01Q17/00
CPCH01Q15/0086H01Q15/002H01Q17/00
Inventor 陈明王帅钊张佑丹陈汉成煜苑立波
Owner GUILIN UNIV OF ELECTRONIC TECH