Tunable plasmonic resonance arising from broken-symmetric silver nanobeads with dielectric cores

You Zhe Ho, Wei Ting Chen, Yao Wei Huang, Pin Chieh Wu, Ming Lun Tseng, Yao Ting Wang, Yuan Fong Chau, Din Ping Tsai

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

We investigate the plasmonic resonance modes and coupling effects of single silver nanobeads and silver nanobead dimers. Numerical investigation using the three-dimensional finite element method indicates that silver nanobeads exhibit two plasmonic resonances corresponding to the bonding and anti-bonding modes, respectively. The boundary symmetry on the inner and outer surfaces of the silver nanobeads can be broken by increasing the refractive indices of the cores filling the dielectric holes. It is shown that only the bonding mode can be found for low-refractive index cores, whereas both bonding and anti-bonding modes can be found for high-refractive index cores.

Original languageEnglish
Article number114010
JournalJournal of Optics (United Kingdom)
Volume14
Issue number11
DOIs
Publication statusPublished - 2012 Nov 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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