Preparation method for non-close-packed opal photonic crystal

Abstract

The invention relates to a preparation method for a non-close-packed opal photonic crystal. The preparation method comprises the following steps of: preparing SiO2 spherical particles from tetraethoxysilane; performing ultrasonic and vertical deposition on large-sized SiO2 spherical particles and small-sized SiO2 organic particles to obtain a double-size colloid crystal structure; and calcining the obtained heterogeneous double-size colloid crystal structure at the combustion decomposition temperature of organic particles to remove organic matters to obtain the non-close-packed opal photonic crystal. By the method, equipment is simple. the method is simple and convenient in operation, preparation cycle is short, and product yield is high.

Description

technical field [0001] The invention relates to a preparation method of a photonic crystal, in particular to a preparation method of a non-close-packed opal photonic crystal. Background technique [0002] Photonic crystals are a new type of optical microstructure material whose refractive index changes spatially periodically. Photons are to artificial periodic dielectric materials, which is equivalent to electrons to semiconductor materials, hence the name. Among them, a three-dimensional ordered structure in which monodisperse microspheres are arranged periodically with a certain space interval in a certain medium is called a non-close-packed photonic crystal. This type of photonic crystal can improve the controllability of the photonic crystal. The methods for preparing non-close-packed photonic crystals mainly include microfabrication and self-assembly methods. The microfabrication method can prepare various photonic crystal structures, but the cycle is long and the cost ...

AI Technical Summary

Problems solved by technology

The methods for preparing non-close-packed photonic crystals mainly include microfabrication and self-assembly methods. The microfabrication method can prepare various photonic crystal structures, but the cycle is long and the cost is high; while the structure prepared by the self-assembly method is relatively simple, but its The preparation process equipment is simple, the cycle is short, and the cost is low

In the self-assembly method, there are currently three main methods: (1) disperse monodisperse microspheres in a polymerizable polymer monomer solution for polymerization, and the polymerization reaction is relatively difficult in the process of this method; (2) in the compact Packing colloidal crystals are filled with elastic materials with stretching properties, and then the elastic materials are stretched to convert the tightly packed colloidal crystals into non-closely packed colloidal crystal structures, which have the disadvantages of less flexible materials to choose from and difficult perfusion (3) Self-assemble the core-shell structure, and then remove the core or shell. It is difficult to prepare spherical core-shell particles with a narrow particle size distribution in this method