Tunable terahertz transmission behaviors and coupling mechanism in hybrid MoS2 metamaterials

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.