Photoluminescence revealed higher order plasmonic resonance modes and their unexpected frequency blue shifts in silver-coated silica nanoparticle antennas

Atta Ur Rahman, Junping Geng, Richard W. Ziolkowski, Tao Hang, Qaisar Hayat, Xianling Liang, Sami Ur Rehman, Ronghong Jin

Research output: Contribution to journalArticle

Abstract

Higher order plasmonic resonance modes and their frequency blue shifts in silver-coated silica nanoparticle antennas are studied. Synthesizing them with a wet chemistry method, silica (SiO2) nanoparticles were enclosed within silver shells with different thicknesses. A size-dependent Drude model was used to model the plasmonic shells and their optical losses. Two higher order plasmonic resonances were identified for each case in these simulations. The photoluminescence spectroscopy (PL) experimental results, in good agreement with their simulated values, confirmed the presence of those two higher order resonant modes and their resonance frequencies. When compared with pure metallic Ag nanoparticles, size-induced blue shifts were observed in these resonance frequencies.

Original languageEnglish (US)
Article number3000
JournalApplied Sciences (Switzerland)
Volume9
Issue number15
DOIs
StatePublished - Jan 1 2019

Keywords

  • Blue shift
  • Core-shell nanoparticle
  • Higher order modes
  • Nanoantenna
  • Size-dependent optical losses

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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