Tunable terahertz transmission behaviors and coupling mechanism in hybrid MoS2 metamaterials

Abstract

Abstract A hybrid metamaterial with the integration of molybdenum disulfide (MoS2) overlayer is proposed to manipulate the terahertz (THz) wave. The simulated results indicate that the introduction of MoS2 layer could significantly modify the resonant responses with large resonance red-shift and bandwidth broadening due to the depolarization field effect, especially for the structure on the small permitivity substrate. Additionally, the wide-band modulator in off-resonant region and a switch effect at resonance can be achieved by varying the conductivity of MoS2 layer. Further theoretical calculations based on the Lorentz coupling model are consistent with the simulated results, explicating the response behaviors originate from the coupling between MoS2 overlayer and the metastructure. Our results could provide a possibility for active control THz modulator and switchable device based on the MoS2 overlayer and advance the understanding of the coupling mechanism in hybrid structures.