Visible light stealth based on 2D holographic antireflection coatings

摘要

The reflection efficiency of material surface can be reduced by fabricated sub-micron periodic structures. Part of the light energy will propagate along the surface of the material as guided wave, thereby, the interaction between material and light is increased and the light absorption efficiency in visible light stealth material is improved. In this paper, two-dimensional (2D) relief periodic structure with 300nm was fabricated by holographic lithography. Test results show that the reflection efficiency of the material surface can be reduce after fabricated 2D periodic structures. However, because of the presence of diffraction orders, the zero order transmission diffraction efficiency is reduced in short wavelength band. Through rational design of the duty cycle and etching depth, the diffraction efficiency of reflection can be reduced, and then, the optical coupling efficiency of the material can be improved and the visible light stealth properties of the material can be improved too.