Selective excitation of multipolar surface plasmon in a graphene-coated dielectric particle by Laguerre Gaussian beam

Yang Yang^{1, 2}, Zhang Guanghua^{1, †}, Dai Xiaoyu¹

(a) Local surface plasmonic spectra for a graphene-coated dielectric particle excited by a Gaussian wave (particle radius R = 50 nm, Fermi level E_F = 0.6 eV); (b) and (c) the optical extinction spectra (Q_ext) of the graphene-coated polystyrene particle with the variation of the particle size and the Fermi level of graphene, respectively.