Tunable magnetoplasmonics in lattices of Ni/SiO2/Au dimers

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • University of Luxembourg
  • CIC nanoGUNE
  • Basque Foundation for Science
  • Autonomous University of Barcelona

Abstract

We present a systematic study on the optical and magneto-optical properties of Ni/SiO2/Au dimer lattices. By considering the excitation of orthogonal dipoles in the Ni and Au nanodisks, we analytically demonstrate that the magnetoplasmonic response of dimer lattices is governed by a complex interplay of near- and far-field interactions. Near-field coupling between dipoles in Ni and low-loss Au enhances the polarizabilty of single dimers compared to that of isolated Ni nanodisks. Far-field diffractive coupling in periodic lattices of these two particle types enlarges the difference in effective polarizability further. This effect is explained by an inverse relationship between the damping of collective surface lattice resonances and the imaginary polarizability of individual scatterers. Optical reflectance measurements, magneto-optical Kerr effect spectra, and finite-difference time-domain simulations confirm the analytical results. Hybrid dimer arrays supporting intense plasmon excitations are a promising candidate for active magnetoplasmonic devices.

Details

Original languageEnglish
Article number9907
Pages (from-to)1-11
JournalScientific Reports
Volume9
Issue number1
Publication statusPublished - 1 Dec 2019
MoE publication typeA1 Journal article-refereed

Download statistics

No data available

ID: 35580165