Three-order nonlinear optical telluro-composite film and preparation method thereof

Abstract

The invention discloses a three-order nonlinear optical telluro composite film and a preparation method thereof. In the method, a Te / TeO2-SiO2 composite film structure formed by TeO2 and / or Te is embedded among SiO2 particles; the film is prepared by an electrochemically induced sol-gel method, the composite film structure has good nonlinear features, and three-order nonlinear optical polarizability Chi (3) reaches more than 10<-8>esu; the Te / TeO2-SiO2 composite film is prepared by an electrochemical method through TeO2-SiO2 transparent composite sol, TeO2 and / or Te is separated out of the soil by virtue of electrochemical induction to form a film with SiO2, thus achieving the purpose of forming the Te / TeO2-SiO2 composite film structure, and realizing simple process; and the Te / TeO2-SiO2 composite film is prepared by a vacuum coating method through TeO2-SiO2 transparent composite sol-gel; and by virtue of temperature control for heat treatment, composition and structure of gel powder is regulated and controlled, thus achieving the purpose of forming the Te / TeO2-SiO2 composite film structure, and having simple and reliable process as well as uniform thickness of film layers.

Description

technical field [0001] The invention relates to an optical thin film and a preparation method thereof, in particular to a third-order nonlinear optical tellurium-based composite thin film and a preparation method thereof. Background technique [0002] Nonlinear optical materials are materials whose optical properties depend on the intensity of incident light. As the material basis of modern optical communications, nonlinear optical materials are widely used in optical communications, optical computers, optical information processing, and optical switches. In the prior art, there are a wide variety of nonlinear optical materials, among which tellurium-based materials, such as TeO 2 and TeO 2 Solid materials such as base glass have received special attention due to their unique high nonlinear refractive index. Studies have shown that TeO 2 Glass is an ideal material for preparing devices such as optical switching devices, acousto-optic devices and optical amplifiers. Howeve...

AI Technical Summary

Problems solved by technology

But for TeO 2 -SiO 2 The transparent sol system adopts the tellurium-based film made by the pulling method, and the composition of the obtained film is unstable (such as reacting with water in the air), and the thickness is not easy to control uniformly, which ultimately affects the quality of the film; at the same time, only the pulling method cannot Change the composition of the sol after film formation according to the needs, and it is impossible to fundamentally change the properties of the film