Effect of defects and doping on the transmission spectrum enhancement of photonic crystal based on 2D-MoS₂

Abstract

In this paper, we present the structural and photoluminescence (PL) spectra of 2D-MoS 2 and we report a theoretical investigation of the influence of Ag- and Au-doping on the transmission in 2D-MoS 2 photonic crystal structure (PCS). A finite-difference time-domain (FDTD) technique and plane wave expansion method (PWE) have been introduced and adapted for periodic and aperiodic structures to extract the PC-bandgap and study the behavior of the transmission spectrum. The impact of the size of defects, the Ag- and Au-doping on the 2D-PC band structure and transmission spectrum has been visualized under the inclusion of the distribution of electromagnetic fields and the associated field maps. It has been shown that the Au-doping changes significantly the 2D-MoS 2 PCS and as a result the transmission spectrum increases considerably. We can predict that 2D-MoS 2 PC doped with Au is more convenient than doped with Ag in most applications involving optical transmission and waveguides for optoelectronics devices.