Fig. 3
From: Ultra-confined surface phonon polaritons in molecular layers of van der Waals dielectrics
Highly confined SPhPs on bi-layer MoS2–SiC structure. a–d Near-field images (c, d) and corresponding cross-sections (a, b) along cyan dotted lines, recorded at ω = 930 and 924.5 cm−1. e AFM topography of the sample. Inserted white profile shows the height variation along the bottom red line. f Near-field image at ω = 897 cm−1. Inset in image (f) shows cross-section of the near-field signal along the dotted white line. Scale bars are 400 nm
