US 5,472,777 A · Nonlinear optical thin film

Abstract

A novel structure has, on a substrate a nonlinear optical thin film having a high .chi..sup.(3) value provided wherein metal fine particles are uniformly dispersed in a ferroelectric or highly dielectric matrix and heat treated whereby the metal fine particles and matrix are improved in crystallinity. The excitation wavelength can be substantially changed by a choice of the heat treating conditions. The crystallinity of the metal fine particles and matrix and .chi..sup.(3) value are improved by selecting a proper substrate or changing the heat treating procedure and conditions. The thin film is further improved in nonlinear optical properties, typically .chi..sup.(3) and .chi..sup.(3) /.alpha. values by using a perovskite type compound ABO.sub.3 having a specific A/B ratio as the matrix material and controlling film deposition conditions for improving the crystallinity of the matrix.

Claims14

Dependent claims

A composite structure having a nonlinear optical film formed on a substrate, wherein

said film contains 1 to 80% by volume of particles of at least one metal in a ferroelectric or dielectric matrix,
the material of which said matrix is made is a composite oxide comprising at least one atom A selected from the group consisting of Ca, Ba, Sr, Pb, K, Na, Li, La and Cd, and at least one atom B selected from the group consisting of Ti, Zr, Ta and Nb, said composite oxide having an atomic ratio A/B ranging from 0.4 to 1.2,
said particles have a mean particle size of 1 to 100 nm, and
said matrix has a dielectric constant of at least about 10 at room temperature.

1 more element

Dependencies are inferred from the claim text.

Nonlinear optical thin film

Life of this patent

Nonlinear optical thin film

Life of this patent

Abstract

Claims14