Fig. 2

Interaction of graphene plasmons with carrier concentrations and Moiré superlattice. a Near-field images of graphene under selective doping by a patterned substrate at 1380 cm^− 1 (left), 1496 cm^− 1 (middle), and 1591 cm^− 1 (right) excitation conditions. Reprinted with permission from [39]. Copyright 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. b Near-field image (left) of a twisted bilayer graphene overlapped with dark field TEM image (right). The dashed hexagon denotes unit cell of the light-matter interaction pattern. From [40], Reprinted with permission from AAAS