Efficient light absorption device based on structural symmetry breaking and preparation method and application

A symmetry, light absorption technology, applied in the fields of nanophotonics, photoelectric detection and optical sensing, can solve the problems of extremely high requirements on preparation technology and processing accuracy, weakened graphene absorption enhancement, weakened graphene absorption efficiency, etc. Avoid the effects of reduced absorption efficiency, reduced preparation difficulty, and improved angular tolerance

Active Publication Date: 2021-01-22
JIANGNAN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, this method of improving the light absorption of graphene based only on the resonance effect is often not high enough in light absorption efficiency.
(2) Using the micro-nano structure with a metal mirror, that is, integrating graphene into the micro-nano structure with a metal mirror, based on the resonance phenomenon of the micro-nano structure, using the high reflection effect provided by the metal mirror, in the Under strict coupling conditions, graphene can achieve high-efficiency absorption enhancement of light. However, due to the presence of metal in the structure of this method, part of the light energy is inevitably lost in the metal due to the ohmic loss of the metal material itself. will lead to the weakening of graphene's light absorption efficiency
Enhanced light absorption by graphene is inevitably weakened due to ohmic losses in metal mirrors
The all-dielectric Bragg reflector needs to use more than two kinds of dielectric materials, and requires a large number of film layers, resulting in a large overall thickness of the device, which is not conducive to the realization of ultra-compact and easy-to-integrate ultra-thin photonic devices; in addition, this high and low Bragg reflectors constructed of all-dielectric multilayer film stacks require extremely high manufacturing technology and processing accuracy, which is not conducive to low-cost applications

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  • Efficient light absorption device based on structural symmetry breaking and preparation method and application
  • Efficient light absorption device based on structural symmetry breaking and preparation method and application
  • Efficient light absorption device based on structural symmetry breaking and preparation method and application

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Embodiment 1

[0040] Example 1: A device for achieving high-efficiency light absorption in graphene based on structural symmetry breaking

[0041] A device based on structural symmetry breaking to achieve high-efficiency light absorption in graphene. The schematic diagram of its structure is shown in figure 1 shown. Single-layer graphene is placed between the quartz substrate and the silicon grating (including the silicon grating layer and the silicon film layer), and the thicknesses of the silicon grating layer and the silicon film layer are d 1 and d 2 , the grating width is w, and the grating period is p. Since there is a narrow groove with a width s in the silicon film layer between the grating grids, the symmetry of the grating structure about the yz plane is broken.

[0042] The corresponding preparation process is as follows:

[0043] (1) To prepare single-layer graphene on a quartz substrate, the single-layer graphene can be directly deposited on the quartz substrate by chemical ...

Embodiment 2

[0057] Example 2: Graphene Enhanced Light Absorption Method Based on Symmetry Breaking to Achieve High Preparation Tolerance

[0058] Since the light absorption enhancement of graphene comes from the broken symmetry of the structure, as long as there is a broken symmetry in the structure, a symmetric protection mode will be generated, and at the excitation wavelength of the symmetric protection mode, the corresponding light field will be highly suppressed in the structure Localized and enhanced, so that single-layer graphene can maintain a high light absorption efficiency. Therefore, even if the structural parameters are greatly changed, the light absorption enhancement effect is still relatively significant. Figure 6 For the impact of structural parameter changes on the absorption spectrum in this embodiment, wherein the narrow groove width s=74nm, other parameters are the same as figure 2 same. From Figure 6 In (a), it can be seen that when the narrow groove moves sign...

Embodiment 3

[0059] Example 3: Graphene Enhanced Light Absorption Method Based on Symmetry Breaking to Realize Large Angle Tolerance

[0060] Due to the traditional incident conditions (in this embodiment, the incident plane is the xz plane), the tangential wave vector of the incident light (in this embodiment, the x direction) can be expressed as k x =k 0 sinθ, where k 0 =2π / λ 0 is the vacuum wave vector (λ 0 wavelength of incident light), θ is the incident angle, so the incident angle θ xz The change of will change the wave vector of the incident light in the x direction, and then affect the phase matching condition of the grating, that is, k x and the grating reciprocal vector (in this embodiment, the grating reciprocal vector is along the x direction, the size is 2πm / p, where m is the diffraction order, and p is the grating period) and the grating high-order diffraction wavevector (k x,m ) wave vector matching (ie k x,m =k x +2πm / p). Therefore, under the traditional incident co...

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Abstract

The invention relates to an efficient light absorption device based on structural symmetry breaking. The device comprises a substrate (1), a grating (2) and an absorption material (3); the grating (2)comprises a grating layer and a film layer, the grating layer is located on the film layer, the absorption material (3) is arranged between the film layer and the substrate (1), and a notch groove (4) is formed in the film layer between grids, so that the grating (2) is broken symmetrically. The efficiency light absorption device based on structural symmetry breaking can realize high-efficiency graphene light absorption, also has very high structure preparation tolerance, angle tolerance and refractive index sensing functions, and has a very good application prospect in the fields of photoelectric detection, photo-thermal conversion, photoelectric imaging, optical filtering, fluorescence spectrum, biosensing and the like.

Description

technical field [0001] The invention relates to the fields of nanophotonics, photoelectric detection and optical sensing, in particular to a graphene high-efficiency light absorption device based on structural symmetry breaking and its application. Background technique [0002] Graphene is an ideal two-dimensional material composed of carbon atoms and arranged in a hexagonal honeycomb lattice. Although it is only the thickness of a single atomic layer, it has ultra-high carrier mobility. The meter energy level is adjustable, and the advantages of good photoelectric, mechanical and chemical stability are of great application value in the interdisciplinary fields of physics, chemistry, materials and electronics. In particular, a series of novel discoveries about graphene have been made in recent years. For example, two layers of graphene can be stacked into a "magic angle" to achieve "high temperature" superconductivity, flexible graphene photodetectors can be applied to weara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G02B5/18
CPCG02B5/003G02B5/18
Inventor 桑田
Owner JIANGNAN UNIV
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