Asymmetrical plasmon reflections in tapered graphene ribbons with wrinkle edges

Yang Cui^{1, 2}, Chen Runkun^{1, 2}, Jia Yuping^{1, 2, 4}, Guo Liwei^{1, 2, †}, Chen Jianing^{1, 2, 3, ‡}

(color online) Schematic of scattering-type scanning near-field optical microscopy. The excitation light is an infrared laser, and the sample is epitaxially grown graphene on silicon carbon substrate.