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Updated: Apr 11, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Multipole coupling effects beyond the general plasmon hybridization theory
Guo Zhou1, Liren Deng1, Hao Yu1
1Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China.
Abstract:
By means of full-wavelength near-field plasmon mapping, gradual evolutions of multipole coupling modes in Ag nanoparticle homodimer and heterodimer hotspots are witnessed. According to the symmetry and distributions of the compressed surface charge lobes, various complicated high-order coupling modes are identified, which turns out to be beyond the prediction of the general plasmon hybridization model. Specifically, different intermediate states between the bonding dipole-dipole coupling and bonding quadrupole-quadrupole coupling can be observed. Our results provide an essential understanding of the dimer hotspot systems and pave a new way for the exploration of multipole coupling effects in plasmonic complexes.
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