Fig. 4: Plasmon confinement for various thin films.
From: Slow and highly confined plasmons observed in atomically thin TaS2
The dispersion relation of 2D plasmons and polaritons of various thin films are shown, as a function of their confinement ratio. Patterned arrays of 3-nm-thick gold and 40-nm-thick TaSe2 were measured with FTIR12,58; Dirac plasmons and acoustic plasmons in graphene were measured with s-SNOM59,60 and Dirac plasmons in graphene on polar substrates were measured by reflective q-EELS6. The results presented in the present work are indicated by the red star.
