Thursday, July 20, 2017
Abstract-Liquid crystal control of the plasmon resonances at terahertz frequencies in graphene micro-ribbon gratings
V. Yu. Reshetnyak, V. I. Zadorozhnii, I. P. Pinkevych, and D. R. Evans
We theoretically studied influence of the LC orientational state on the absorption, reflection, and transmission spectra of a graphene micro-ribbon grating placed between a nematic LC and an isotropic dielectric substrate. We calculated the absorption, reflection, and transmission coefficients at normal incidence of a far-infrared TM-wave (THz) and show that control of the orientational state of the LC layer enables the manipulation of the magnitude of the absorption/reflection maxima. The influence the LC orientational state on the plasmonic resonance increases with an increase of the isotropic substrate dielectric constant and the graphene micro-ribbon width to grating spacing ratio.