Study on Broadband Antireflection Optical Film in Visible Band

Abstract

In this paper, a coating research method based on different experimental conditions is proposed, and a broadband antireflection film in visible light band is designed. TiO₂ and MgF₂ were selected as coating materials. The broadband antireflection film (AR film) in 380 nm~780 nm band was designed by TFCalc software. The refractive index of each band of single-layer TiO₂ and MgF₂ film, as well as the effects of different central wavelengths, refractive index error and thickness error of single-layer material and incident angle on the average transmittance (AT) of broadband AR film in visible band were analyzed through simulation experiments. The results show that when the central wavelength is 610nm, the incident angle is less than 50˚, the refractive index deviation of TiO₂ is −0.2~0, the thickness deviation is −10~0 nm, the refractive index deviation of MgF₂ is −0.1~0.1, and the thickness changes between −5 nm~5 nm, the full band average transmittance can be more than 96%, which provides a reference research way for the research of optical films.