Broadband ultra-high transmission of terahertz radiation through monolayer MoS2

In this study, the terahertz (THz) absorption and transmission of monolayer MoS2 with different carrier concentrations were investigated theoretically. The calculation shows that the THz absorption of monolayer MoS2 is very low even under high carrier concentrations and large incident angles. The sum of reflection and absorption losses of monolayer MoS2 is lower than that of graphene by one to three orders of magnitude. The transmission of monolayer MoS2 is higher than that of two-dimensional electron gases in traditional GaAs and InAs. The field-effect tube structure formed by monolayer MoS2-insulation-layer-graphene is also studied. The THz absorption of graphene can reach saturation under low voltage by tuning the voltage between MoS2 and graphene layers in the structure. The maximum THz absorption of monolayer MoS2 is approximately 5%. Thus, monolayer MoS2 is a promising candidate for THz transparent electrodes. (C) 2015 AIP Publishing LLC.