Nonlinear optical thin film

摘要

A novel nonlinear optical thin film having a high chi (3) value is 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 (3) value are improved by selecting a substrate used or changing the heat treating procedure and heat treating conditions. By forming a portion having a lower content of metal fine particles in a surface portion on an upper and/or lower side of the matrix, the excitation wavelength can be substantially changed and precisely adjusted.