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Optical Response of Metal Nanoparticles

Optical Characterization of Metal Nanoparticles

  • Plasmons in single Ag particles
  • Size-dependent plasmon response from single Ag particles
  • Optical response of metal nanoparticles governed by Mie-plasmons
  • STM-luminescence spectroscopy enables determination of plasmon energies for a single particle as function of size, shape and chemical composition

Plasmons in single Ag particles

  • Controlled stimulation of horizontal and vertical plasmon modes for different tip positions above the particle

https://uol.de/fileadmin/_processed/f/1/csm_Plasmonen_01_81e5062658.jpg

Topography and luminescence maps of a single silver particle measured at different bias conditions

For details: Myrach et al. Phys. Rev. B 83 (2011) 035416.

 

Size-dependent plasmon response from single Ag particles

  • Blue shifted silver plasmon with decreasing particle size
  • Assigned to reduced screening of plasmon mode at particle surface

https://uol.de/fileadmin/_processed/1/b/csm_Ag-Teilchen_1ec7537c90.png

STM luminescece from Ag particles labeled in the inset (30×30 mm2)

For details: Nilius et al. Phys. Rev. Lett. 84 (2000) 3994.

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