Journal article
Scaling of the Surface Plasmon Resonance in Gold and Silver Dimers Probed by EELS
Center for Electron Nanoscopy, Technical University of Denmark1
Department of Photonics Engineering, Technical University of Denmark2
Quantum and Laser Photonics, Department of Photonics Engineering, Technical University of Denmark3
Department of Physics, Technical University of Denmark4
Biophysics and Fluids, Department of Physics, Technical University of Denmark5
The dependence of surface plasmon coupling on the distance between two nanoparticles (dimer) is the basis of nanometrology tools such as plasmon rulers. Application of these nanometric rulers requires an accurate description of the scaling of the surface plasmon resonance (SPR) wavelength with distance.
Here, we have applied electron energy-loss spectroscopy (EELS) and scanning transmission electron microscopy (STEM) imaging to investigate the relationship between the SPR wavelength of gold and silver nanosphere dimers (radius R) and interparticle distance (d) in the range 0.1R
We find that the decaying exponential description of the fractional SPR wavelength shift with (d/2R) holds valid only over a limited range of d. Instead, within the range 0.1R
Despite this common power dependence, consistently larger SPR wavelength shifts are registered for silver for a given change in d, implying silver dimers to be more sensitive plasmon rulers than their gold counterparts.
| Language: | English |
|---|---|
| Year: | 2014 |
| Pages: | 5478-5485 |
| ISSN: | 19327455 and 19327447 |
| Types: | Journal article |
| DOI: | 10.1021/jp500288s |
| ORCIDs: | Kadkhodazadeh, Shima , Beleggia, Marco and Wagner, Jakob Birkedal |
