This paper is focused on optical nonlinearity in CdS nanostructured thin films, which was reviewed comprehensively and discussed in detail along with future perspective. Due to third harmonic generation in CdS materials on exposed to highly intense light that is significant feature to develop modern photonics devices. CdS chalcogenide semiconductor binary compound is one of the most particularly promising candidate for nonlinear optical applications due to their enhanced nonlinear optical properties in thin films. CdS nanostructured thin films have been shown exceptional third order nonlinear optical (TONLO) behavior near the sub band gap energy region. This review will be based on TONLO properties of CdS nanostructured thin films, which will focus on the tailoring of TONLO properties as a function of particle size, dopant and CdS polymer nanocomposite. Doping and size effect in CdS system is the important opportunity to develop it with excellent TONLO properties. This review paper will give an open area of research possibilities to search the efficient nonlinear optical CdS nanostructured thin films for advanced modern photonics applications and also will provide an idea to develop efficient materials with exceptional TONLO properties.

本文重点研究了 CdS 纳米结构薄膜中的光学非线性，对其进行了全面回顾并结合未来前景进行了详细讨论。由于 CdS 材料在暴露于强光下会产生三次谐波，这是开发现代光子学器件的重要特征。CdS 硫族化物半导体二元化合物由于其在薄膜中增强的非线性光学特性而成为非线性光学应用中最有前途的候选者之一。CdS 纳米结构薄膜在子带隙能量区附近显示出特殊的三阶非线性光学 (TONLO) 行为。本综述将基于 CdS 纳米结构薄膜的 TONLO 特性，重点关注 TONLO 特性作为粒径函数的定制，掺杂剂和 CdS 聚合物纳米复合材料。CdS 系统中的掺杂和尺寸效应是开发具有优异 TONLO 性能的重要机会。这篇综述论文将为研究用于先进现代光子学应用的高效非线性光学 CdS 纳米结构薄膜提供一个开放的研究领域，并将提供开发具有卓越 TONLO 特性的高效材料的想法。