Figure 1
From: The reduction of surface plasmon losses in quasi-suspended graphene
Illustration of the damping of graphene plasmons on silicon dioxide substrate at mid-infrared frequencies
(a) A sketch of the principle behind scattering-type scanning near-field optical microscope (s-SNOM) measurements. (b,d) Optical near-field images of exfoliated graphene flakes, recorded at λ2 = 11.2 μm and λ1 = 10 μm, respectively. (c,e) Corresponding cross-sections along dotted yellow lines in images (b,d) which represent a distribution of the near-field across graphene-SiO2 boundary. Green and pink dotted lines mark GPs’ field magnitudes at the first maximum close to the boundary ((Es)pl) and inside the inner part of graphene flakes (background value, (Es)bg).
