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The absorption coefficients of a far-infrared wave are calculated at normal incidence for MoS2 and graphene-MoS2 micro-ribbon gratings placed between a nematic LC and an isotropic dielectric medium. Maxima in the absorption spectra, which are related to the excitation of the surface plasmons in micro-ribbons of these gratings, are observed. The spectral position of absorption maxima depends on the grating spacing, micro-ribbon width, and conductivity of the ribbons. The impact of the 2D electron concentration of the MoS2 ribbons on the plasmon bands is different for a MoS2-grating versus a graphene-MoS2 grating. The influence of the LC orientational state on the absorption spectra of the gratings enables the manipulation of the absorption peak magnitude.

Surface plasmon absorption in MoS2 and graphene-MoS2 micro-gratings and the impact of a liquid crystal substrate