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A kind of gradient refractive index thin film based on hybrid sol and its preparation method

A refractive index gradient, refractive index technology, applied in optics, instruments, optical components, etc., can solve the problems of inability to make refractive index multilayer films, difficult to control the thickness of the deposited film, and inability to accurately control the thickness of the film, and achieve a wide range of applications. , Easy to achieve, the effect of reducing surface roughness

Active Publication Date: 2017-02-01
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method cannot accurately control the thickness of the film when adjusting the refractive index of the film, and the roughness of the film surface is large
When another layer of film is deposited on the surface of a rough film, it is difficult to control the thickness of the deposited film, and this method cannot make a multilayer film with a graded refractive index

Method used

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  • A kind of gradient refractive index thin film based on hybrid sol and its preparation method
  • A kind of gradient refractive index thin film based on hybrid sol and its preparation method
  • A kind of gradient refractive index thin film based on hybrid sol and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0072] The method for preparing a graded refractive index film based on hollow nanoparticle sol and inorganic nano-binder sol in this embodiment includes:

[0073] (1) Prepare hollow nanoparticle sol and inorganic nano-binder sol respectively.

[0074] Wherein, the specific process of preparing the hollow nanoparticle sol is the same as that of the test example, and the method of preparing the inorganic nano-binder sol is also the same as that of the test example.

[0075] (2) The hollow nanoparticle sol prepared in step (1) and the inorganic nano-binder sol are hybridized to obtain a hybrid sol.

[0076] In this embodiment, the mixing ratio during the hybridization treatment is 1:0.041. During the hybridization treatment, the mixed solution is stirred for 3 hours, and aged for 3 days after the stirring is completed.

[0077] (3) The sol (in this example, hybrid sol, SiO 2 Hollow nanoparticle sol and SiO 2Acid-catalyzed binder sol) is sequentially coated on the substrate to...

Embodiment 2

[0086] The preparation method of the hybrid sol-based gradient refractive index film of this embodiment includes:

[0087] (1) Prepare hollow nanoparticle sol, inorganic nano-binder sol and organic nano-binder sol, respectively.

[0088] The steps for preparing the hollow nanoparticle sol are the same as in Example 1, except that the molar ratio of the first inorganic source, deionized water, ammonia monohydrate, ethanol and polyacrylic acid in the initial mixed solution is 1:42:23:624 : 0.015, when the first inorganic source is added and the time interval between two adjacent additions is 0.5h.

[0089] The SiO prepared in this example 2 The concentration (mass percentage) of hollow nanoparticles in the hollow nanoparticle sol is 0.19%, SiO 2 The hollow nanoparticles have a particle size of 62 nm and a wall thickness of 4 nm.

[0090] Prepare the inorganic nano-binder sol by hydrolyzing the second inorganic source under acidic conditions:

[0091] During hydrolysis, absol...

Embodiment 3

[0108] The method for preparing a graded refractive index film based on a hybrid sol in this embodiment includes:

[0109] (1) Prepare hollow nanoparticle sol, inorganic nano-binder sol and organic nano-binder sol, respectively.

[0110] Wherein, the steps of preparing the hollow nanoparticle sol are the same as the test example 1, and the prepared hollow nanoparticle sol is the same as the test example.

[0111] Prepare the inorganic nano-binder sol by hydrolyzing the second inorganic source under acidic conditions:

[0112] During hydrolysis, absolute ethanol is used as a solvent, and hydrogen chloride is used as a catalyst. During hydrolysis, the second inorganic source in the hydrolysis solution (in this embodiment, the second inorganic source is zirconium oxychloride): hydrogen chloride: deionized water: moles of absolute ethanol The ratio is 1:6.5×10 -4 : 2: 22.3, the hydrolysis time was 3 hours, the hydrolysis temperature was normal temperature (25°C), the stirring wa...

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Abstract

The invention provides a hybrid sol-based graded refractive index film and a preparation method thereof. The hybrid sol is prepared by hollow nano particle sol and nano binder sol through hybrid processing, the corresponding film is prepared based on different sol selected by refractive index of each film according to graded refractive index film when the hybrid sol is prepared to the graded refractive index film, wherein the selected sol can be the hybrid sol or hollow nano particle sol or nano binder sol for forming film, the hybrid sol has different ratio, so that the refractive index of the refractive index of the prepared film is different which is set according to the requirement. The hollow nano particle and the nano binder sol are performing hybrid treatment, the refractive index of the prepared film is continuously adjustable in a range of 1.1-2.0, film thickness is not influenced by refractive index and is independently controlled; the binder and the hollow nano particle are bonded, surface roughness of the film is reduced, the quality of the graded refractive index film is increased, and the method has the advantages of simple technology, easy realization and wide usage scope.

Description

technical field [0001] The invention relates to the technical field of thin films, in particular to a gradient refractive index thin film based on a hybrid sol and a preparation method thereof. Background technique [0002] In optical thin films, the refractive index of thin film materials is an important parameter. Multilayer thin films with graded refractive index are widely used in communication, laser and photovoltaic fields. However, in nature, the refractive index suitable for making thin film materials is limited, and artificial methods to prepare variable refractive materials have always been a research hotspot. [0003] In Nature Photonics, 1,176-179 (2007), Schubert et al. reported a method for preparing a gradient-refractive-index thin film using electron beam evaporation oblique-angle deposition technology. By controlling the deposition angle and changing the porosity of the deposition material, the obtained Films of different refractive indices. Chinese patent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/34G02B1/00
Inventor 鲁越晖张景兰品军张贤鹏李佳宋伟杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI