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Anisotropic light absorption device based on multilayer film and preparation method thereof

An anisotropic, light absorption technology, applied in nonlinear optics, optics, optical components, etc., can solve the problems of low absorption efficiency, high cost, difficult preparation, etc., to improve light absorption efficiency, reduce preparation difficulty and The effect of preparation cost

Active Publication Date: 2022-05-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the problems of low absorption efficiency, inability to freely select and switch absorption channels, difficulty in preparation, and high cost in existing light absorption devices, the present invention provides an anisotropic light absorption device based on a multilayer film and its preparation method

Method used

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  • Anisotropic light absorption device based on multilayer film and preparation method thereof
  • Anisotropic light absorption device based on multilayer film and preparation method thereof
  • Anisotropic light absorption device based on multilayer film and preparation method thereof

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Embodiment 1

[0045] This embodiment provides an anisotropic light-absorbing device based on a multilayer film, which includes: a first film stack, an anisotropic optical-absorbing material film layer, and a second film stack stacked up and down in sequence; The film layer of heterotropic optical absorption material is located at the interface between the first film stack and the second film stack;

[0046] The first film stack includes: N stacked up and down periodically 1 a first film group; the first film group includes alternately stacked high-refractive-index film layers and low-refractive-index film layers;

[0047] The second film stack includes: N stacked up and down periodically 2 A second module group; the second film group includes alternately stacked high-refractive-index film layers and low-refractive-index film layers.

Embodiment 2

[0049] This embodiment provides an anisotropic light-absorbing device based on a multilayer film, and its structural schematic diagram is as follows figure 1 (b), that is, in figure 1 (a) The interface between two stacked membrane stacks (membrane stack 1 and membrane stack 2), with an anisotropic α-MoO layer of thickness h inserted 3 film composition. Among them, membrane stack 1 and membrane stack 2 are both symmetrical membrane systems, and the membrane structures are: (0.5LH0.5L) N 1 and (0.5HL0.5H) N 2. Here H and L respectively represent the high and low refractive index film layers with a quarter of the optical thickness at the design wavelength, and N 1 and N 2 are the cycle numbers of membrane stack 1 and membrane stack 2, respectively.

[0050] In this embodiment, the designed waveband is the visible light waveband (400-800nm), and in this waveband, Ta 2 o 5 and SiO 2 As high and low refractive index materials, the refractive indices of the two are 2.1 and 1....

Embodiment 3

[0059] This embodiment provides a method for preparing an anisotropic light-absorbing device based on a multilayer film, which is used to prepare the anisotropic light-absorbing device based on a multilayer film described in Example 2. The preparation method includes:

[0060] Step 1: Prepare the membrane stack 2:

[0061] The film stack 2 is deposited on the substrate, and the film stack 2 is deposited on the quartz or glass substrate by vacuum electron beam evaporation coating or magnetron sputtering coating. The cycle number of membrane stack 2 is N 2 , the structure in one cycle is (0.5HL0.5H), and the corresponding physical thicknesses are d B 、2d A and d B .

[0062] Step 2: Prepare an anisotropic optical absorption material film layer:

[0063] α-MoO with a thickness of h is plated on the membrane stack 2 using a tube furnace 3 thin film, MoO in a crucible in a tube furnace 3 powder, heating MoO under the condition of maintaining low pressure (about 35Pa) 3 powd...

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Abstract

The invention discloses an anisotropic light absorption device based on a multilayer film and a preparation method of the anisotropic light absorption device, and belongs to the field of micro-nano optics, photoelectric detection and laser. The device comprises a first film stack, an anisotropic optical absorption material film layer and a second film stack which are sequentially stacked from top to bottom, the anisotropic optical absorbing material film layer is located on the interface of the first film stack and the second film stack. As the boundary state exists on the interface of the first film stack and the second film stack which are stacked, the light absorption efficiency of the optical absorption material film layer can be effectively improved through light field enhancement induced by the boundary state; besides, the polarization angle of incident light is changed by means of the anisotropy of the optical property of the optical absorption material, tunable light absorption can be achieved under the normal incidence condition, and then the optical switch function is obtained. The method and the device provided by the invention have the advantages of simple structure, high light absorption efficiency, switchable absorption channels and the like, and have great application value in the fields of micro-nano optics, photoelectric detection, laser and optical communication.

Description

technical field [0001] The invention relates to an anisotropic light absorption device based on a multilayer film and a preparation method thereof, belonging to the fields of micro-nano optics, photoelectric detection and laser. Background technique [0002] Anisotropy refers to the fact that the physical and chemical properties of a substance change with changes in direction, showing different properties in different directions. In various applications, the enhancement of anisotropic light absorption based on the anisotropy of the optical properties of materials is extremely valuable in the fields of nonlinear optics, optical switches, polarization state regulation, and spectral analysis. [0003] In the field of optics and material engineering, in order to achieve anisotropic light absorption of linearly polarized light under normal incidence conditions, the following two methods are usually adopted. The first is to impregnate anisotropic materials into polymer films. For...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00G02B26/08G02F1/1335
CPCG02B1/00G02B26/08G02F1/1335
Inventor 桑田裴尧米晴李石杨超钰
Owner JIANGNAN UNIV
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