Fig. 3: Hyperbolic ISP revealed by nano-imaging on Au nanodisk.
a Schematic of hyperbolic polaritons launched at the edge of the Au nanodisk, which travel along conical trajectories and form a bright ring. The distance between the ring and the edge of the Au nanodisk is ∆R. Topography (b) and near-field scattering amplitude s(ω) image of WOx/4L-WSe2 plasmonic cavity with diameter D = 300 nm and excitation energy Eph = 145 meV (c). Scale bar: 300 nm. d Line profile of the measured near-field amplitude taken at the dashed line in (c). Near-field scattering amplitude s(ω) image of sample on the Au nanodisk that is partially covered by WOx/4L-WSe2 and WOx/6L-WSe2 simultaneously and excited with Eph = 114 meV (e) and Eph = 146 meV (f), respectively. Red dashed lines indicate the boundary. Scale bar: 150 nm.
