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Method for enhancing single-layer graphene broadband absorption based on strong coupling effect

A single-layer graphene and strong coupling technology, applied in the field of nanophotonics, can solve the problems of low device performance, absorption fluctuations, limitations, etc., and achieve the effects of small intrinsic loss, high ultrafast modulation, and high modulation bandwidth

Active Publication Date: 2019-01-22
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

[0004] Although graphene has the advantages mentioned above, the significantly low mid-infrared absorption makes the device performance of graphene extremely limited in this band; although various physical principles include: interference, impedance matching, critical coupling, plasmonic Resonance enhancement, etc. have been proposed to improve the absorption efficiency of graphene, but these theories are only designed for narrow-band absorption, and the actual broadband absorption application is far from meeting the requirements.
[0005] At present, broadband absorbers based on graphene have been proposed, but most of the designs are only to improve the absorption performance of the overall device. It is not known whether the absorption performance of single-layer graphene can be improved; Candidates for single-layer graphene absorption, but the excited graphene plasmon resonance in the mid-infrared band is relatively weak, and the coupling between its adjacent resonators will cause inevitable absorption fluctuations, which are not conducive to Practical Applications of Devices

Method used

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  • Method for enhancing single-layer graphene broadband absorption based on strong coupling effect
  • Method for enhancing single-layer graphene broadband absorption based on strong coupling effect
  • Method for enhancing single-layer graphene broadband absorption based on strong coupling effect

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: as figure 1 As shown, a design structure based on the strong coupling effect to enhance the broadband absorption of single-layer graphene, including the graphene nanoribbon array of the absorbing layer and the metal trapezoidal groove substrate structure.

[0032] Among them, the graphene strip array period is 2 μm, the strip width is 67 nm, and the substrate trapezoidal metal groove structure has a top width of 300 nm, a bottom width of 700 nm, and a groove height of 1.4 μm. The metal material of the substrate layer is selected from silver, a metal with low intrinsic loss.

[0033] In this example, the graphene nanoribbons of the absorbing layer are only in contact with one side of the metal trapezoidal groove, thereby ensuring that the excited graphene surface plasmon resonance has less intrinsic loss, thereby promoting the system Excitation of strong coupling effects.

Embodiment 2

[0034] Embodiment 2: as figure 2 and 3 as shown, figure 2 The broadband graphene absorption spectrum generated for this design, when the transverse magnetic (TM) wave is perpendicular to the sample surface, the structure can simultaneously excite the graphene surface plasmon resonance and magnetic resonance. Due to the extremely narrow top trough width limitation, the hybrid mode field caused by the strong coupling between the two modes will be mainly bound at the graphene, resulting in a broadband graphene absorption effect.

[0035] From figure 2 It can be seen that the use of this structure can produce a huge broadband graphene absorption effect with a bandwidth of 2.7 μm, and the absorption rate is 60%, far exceeding the absorption efficiency of single-layer graphene which is only 2.3%.

[0036] image 3 The dispersion curves of the magnetic resonance mode and the graphene plasmon mode are given, which can clearly prove that the broadband absorption effect caused by...

Embodiment 3

[0037] Embodiment 3: as Figure 4 As shown, the specific preparation flow chart of the selected graphene broadband absorption structure based on strong coupling effect enhancement;

[0038] 1) Coating: Coating a layer of 1.4 micron-thick filling dielectric film on the metal substrate, wherein the metal substrate is silver, and the dielectric material of the coating is silicon dioxide;

[0039] 2) Etching: UV etching is performed on the filling medium, and a trapezoidal dielectric array structure is constructed by etching;

[0040] 3) Sputtering metal: sputtering metal on the etched sample, the material is silver which is the same as the metal of the substrate;

[0041] 4) Post-processing: After engraving or polishing, remove the excess metal material on the surface of the sample after magnetron sputtering;

[0042] 5) transfer: graphene is transferred to the upper surface of the post-treated sample;

[0043] 6) Forming: After transferring the processed sample, a graphene na...

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Abstract

The invention discloses a method for enhancing single-layer graphene broadband absorption based on a strong coupling effect, wherein a graphene nanometer strip array is selected as an absorption layer, a metallic channel array as a substrate; a corresponding filling medium is arranged in the metallic channel; graphene surface plasmon resonance is excited through the graphene nanometer strip array;excitation of a magnetic resonance mode is supported through the metallic channel so that hybrid fields generated by strong coupling between the two modes are concentrated at the graphene, finally realizing enhancement of a broadband absorption effect of the graphene, wherein the graphene nanometer strip array used only contacts with one edge of the metallic trapezoid channel array, thereby meeting the resonance condition that excitation of the strong coupling effect requires a relatively high-quality factor graphene plasmon mode. The enhanced absorption broadband in the invention is coveredat the mid-infrared band, has the features of high band pass, low fluctuation, high rate and the like, and can be applied to an integrated all-optical network.

Description

technical field [0001] The invention relates to the technical field of nanophotonics, in particular to a method for enhancing broadband absorption of single-layer graphene based on a strong coupling effect. Background technique [0002] As an intrinsic property of materials, light absorption plays a crucial role in the design of various advanced photonic devices, such as modulators, detectors, solar cells, etc. However, due to the relatively low absorption and narrow parameter space of traditional thin-film materials, the development of their miniaturization is seriously hindered in the mid-infrared band. [0003] At the same time, graphene, as a single atomic layer thin film material, has been widely used in the design of various functional optoelectronic devices because of its ultra-high carrier mobility, excellent tuning ability and nonlinear effect. among. More importantly, the interaction between mid-infrared photons and graphene electrons can generate graphene surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00
CPCG02B5/003G02B5/008
Inventor 胡国华黄磊邓春雨朱渊陈博宇恽斌峰张若虎崔一平
Owner SOUTHEAST UNIV
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