Electric dipole-quadrupole hybridization induced enhancement of second-harmonic generation in T-shaped plasmonic heterodimers

Kai Guo, Yong Liang Zhang, Cheng Qian, Kin Hung Fung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)


In this work, we demonstrate computationally that electric dipole-quadrupole hybridization (EDQH) could be utilized to enhance plasmonic SHG efficiency. To this end, we construct T-shaped plasmonic heterodimers consisting of a short and a long gold nanorod with finite element method simulation. By controlling the strength of capacitive coupling between two gold nanorods, we explore the effect of EDQH evolution on the SHG process, including the SHG efficiency enhancement, corresponding near-field distribution, and far-field radiation pattern. Simulation results demonstrate that EDQH could enhance the SHG efficiency by a factor >100 in comparison with that achieved by an isolated gold nanorod. Additionally, the far-field pattern of the SHG could be adjusted beyond the well-known quadrupolar distribution and confirms that EDQH plays an important role in the SHG process.

Original languageEnglish
Pages (from-to)11984-11993
Number of pages10
JournalOptics Express
Issue number9
Publication statusPublished - 30 Apr 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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