Selective excitation of multipolar surface plasmon in a graphene-coated dielectric particle by Laguerre Gaussian beam
Yang Yang1, 2, Zhang Guanghua1, †, Dai Xiaoyu1
       

Optical extinction spectra Qext of a graphene coated dielectric particle excited by LG beam of order p = 5 with vortex phase factor s = 0–5. The color lines represent the extinction spectra contributed by all modes and the discrete plasmonic modes of dipole, quadrupole, octupole, l = 4, l = 5, respectively. R = 100 nm, EF = 0.6 eV.