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Keywords:

  • core−shell nanoparticles;
  • gold nanorods;
  • optically active materials;
  • plasmon resonance;
  • silver
Thumbnail image of graphical abstract

Evolution of the sizes and plasmonic properties of (Au core)−(Ag shell) nanorods is studied. Four plasmon bands are observed on the core−shell nanorods and their properties are investigated. The lowest-energy one belongs to the longitudinal dipolar plasmon mode, the second-lowest-energy one belongs to the transverse dipolar plasmon mode, and the two highest-energy ones are ascribed to octupolar plasmon modes.