Broadband and perfect absorption of monolayer MoS2 with Octonacci quasi-photonic crystal

Abstract

Monolayer MoS2 only absorbs a small part of the incident light due to its ultrathin thickness, which greatly hinders its possible applications in photodetectors and solar cells. We theoretically demonstrate that broadband and perfect absorption can be realized by using one-dimensional (1D) Octonacci photonic crystals consisting of monolayer MoS2 and the dielectric materials for both transverse magnetic and electric polarized waves. By optimizing the thicknesses of the components and the number of the periodicity, it can be found that the quasiperiodic photonic crystals with different Octonacci sequences have the chance to enable the broadband and high absorption region at the desirable wavelength. In addition, such a region can also be altered via adjusting incident light angle and the polarization of the incident wave. We expect that the Octonacci photonic crystals can provide an alternative way to design the broadband absorber based on monolayer MoS2 at the visible frequency range.