Numerical Study of Periodic Composite Structure Absorber Based on MoS2 Material

Abstract

In this paper, a broadband absorber with a periodic composite structure based on numerical simulation of finite-difference time-domain method (FDTD) is proposed. The absorber base is titanium (Ti), on which iron tetroxide (Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> ) nanospheres are laid. The nanospheres are coated with molybdenum disulfide (MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) and lanthanum fluoride (LaF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) composites, respectively, and are periodically arranged in symmetrical rectangular arrays. The numerical analysis results show that the absorber designed in this paper had an average absorption rate of 95.00% in the light wavelength range of 200 nm to 2500 nm, with the absorption bandwidth reaching 2300 nm, which was a significant improvement compared with other absorbers, and 100.00% absorption was achieved at 300 nm and 650 nm. According to the analysis of the coupling effect of the surface plasmon resonance (SPR) and the localized surface plasmon resonance (LSPR), the ultra-broadband absorber achieved perfect absorption performance. The research results indicate that the absorber proposed in this paper is insensitive to light polarization, has a wide-angle characteristic, and is easy to realize recycling. Therefore, it has a great potential value for the application in photothermal conversion, seawater desalination, and rapid collection of sea salt.