Acoustic plasmonics of Au grating/Bi2Se3 thin film/sapphire hybrid structures
Li Weiwu1, Riegel Konstantin1, Liu Chuanpu2, Taskin Alexey3, Ando Yoichi3, Liao Zhimin2, Dressel Martin1, Yan Yuan1, 4, 5, †
       

The reflectivity of the Ref-sample (a) and the TI-sample (b) with various grating widths in the mid- and near-infrared ranges. (c) The bare plasmon frequencies are plotted versus wave vector q = π/W and it has a linear dispersion rather than the predicted q dispersion behavior.