Generation and control of structural color in asymmetric coaxial cavity

Abstract

Metal nanostructures have great potential for generating and regulating structural color. In this paper, an array structure based on silver nano asymmetric coaxial cavity is designed to study the influence of ring cavity on the generation and regulation of structural color. The ordered array of asymmetric coaxial cavity is simulated by the finite difference time domain method, and the influence of structural parameters on structural color is obtained. The results show that by adjusting the depth, opening size and thickness of coaxial cavity, the rich structural colors can be produced. The experimental results and the simulation results are basically consistent with each other. Compared with the coaxial cavity with symmetrical structure, the asymmetric metal nanostructure proposed in this work has good adjustability in color display, and has potential applications in color imaging, high-resolution imaging, anti-counterfeiting, and so on.