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An electrical control method for the nonlinear optical effect of graphene

A nonlinear optics and optical effect technology, applied in nonlinear optics, optics, instruments, etc., can solve the problems of limiting the application prospects of graphene nonlinear optical effects, not realizing the excitation of single-layer graphene and its corresponding regulation, etc. Enhance the effect of nonlinear optical effects

Active Publication Date: 2020-07-28
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although a large number of devices related to graphene nonlinear optical effects have been proposed or realized, there is still a lack of an effective method to control the intensity of graphene nonlinear optical effects; in addition, single-layer graphite has not been realized before. Reports on the excitation of even-order nonlinear optical effects and their corresponding regulation greatly limit the application prospects of graphene nonlinear optical effects in aspects related to nonlinear optical modulation and switching

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  • An electrical control method for the nonlinear optical effect of graphene
  • An electrical control method for the nonlinear optical effect of graphene
  • An electrical control method for the nonlinear optical effect of graphene

Examples

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Embodiment 1

[0025] Included in this embodiment are graphene devices, excitation optical paths, and electrical regulation and measurement devices, such as figure 1 shown. The graphene device includes a single-layer graphene sample, a substrate material, a source electrode, a drain electrode, a top gate and a dielectric material. The excitation optical path is used to excite nonlinear optical effects in single-layer graphene. The electrical regulation and measurement device is used for applying grid voltage and simultaneously measuring graphene transport properties.

[0026] In the above-mentioned graphene device, the source, drain and top gate are evaporated onto the single-layer graphene sample and the substrate material by using electron beam evaporation combined with a mask method. Wherein, the substrate material is fused silica.

[0027] Among the graphene devices mentioned above, the graphene device uses ion gel as the dielectric material to obtain the optimal tuning ability, which...

Embodiment 2

[0038] Same as Example 1, the difference is the use of Figure 4 The 45-degree oblique-incidence setup is shown to excite second-order nonlinear optical effects in graphene devices. Figure 5 It shows how the strength of the second-order nonlinear optical effect is controlled by the chemical potential of graphene in this example. Figure 5 It shows that the second harmonic effect in graphene is also significantly regulated by the chemical potential of graphene, and it will be enhanced when the chemical potential of graphene shuts down some resonant transition channels.

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Abstract

The invention belongs to the technical field of non-linear optical and photoelectric modulation and particularly provides an electrical regulation and control method for the non-linear optical effectof graphene. A field effect is utilized to conduct electrical doping on the graphene, namely the field effect of a gate electrode is utilized to inject current carriers into the single-layer grapheneso as to adjust the chemical potential of the graphene, open or cut off a resonance transition channel of the non-linear optical process of the graphene and affect the strength of the non-linear optical effect, and accordingly the non-linear optical effect of the graphene is effectively stimulated, regulated and controlled. By adopting the method, second-order, third-order or higher-order non-linear optical effect of the graphene can be remarkably improved and effectively regulated and controlled, and a convenient, reliable and effective electrical regulation and control means is provided forapplication of the graphene in the field of non-linear optics.

Description

technical field [0001] The invention belongs to the technical field of nonlinear optical photoelectric modulation, and in particular relates to an electrical control method for graphene nonlinear optical effects. Background technique [0002] As the first two-dimensional material discovered by humans that can exist stably in nature, graphene has been discovered by British scientists K.S. Novoselov and A.K. Geim in 2004. High mobility, fixed light transmittance (undoped graphene), linear energy band structure, and zero energy gap have attracted extensive attention from researchers and business circles. At present, the properties of graphene in the field of linear optics are well known and have been used in practical engineering applications, such as infrared detectors, touch screens, electronic paper, etc. In contrast, the potential of graphene in the field of nonlinear optics is still understudied and underexploited. [0003] Due to the unique linear energy band structure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/355G02F1/00
CPCG02F1/0081G02F1/355
Inventor 吴施伟黄迪江涛张雨单雨薇刘韡韬
Owner FUDAN UNIV