Formation of normal surface plasmon modes in small sodium nanoparticles
arXiv:1912.08604 · doi:10.1039/D0CP00323A
Abstract
Formation of surface plasmon modes in sodium nanoclusters containing 20-300 atoms was studied using the GW method. It is shown that in the small Na nanoparticles up to 2 nm in size, the loss function is dominated by a single peak corresponding to localized surface plasmon resonance (LSPR). For particles of 2 nm and more, a resonance corresponding to surface plasmon polariton (SPP) oscillations begins to form, as well as a resonance corresponding to volume plasmon (VP) excitations. Considering the above, the linear size of a particle in the range of 0.7-3.7 nm can be estimated as the lower limit for metal nanodevices operating with SPP. On the example of spherical nanoparticles consisting of a silicon core coated with sodium atoms, it is shown that the LSPR mode is selectively suppressed while the SPP mode is not. Such composite structures can be considered as an example of nanoplasmonic devices with selectively tuned characteristics.
arXiv comment13 pages, 4 figures
References in corpus (8)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- BerkeleyGW: A Massively Parallel Computer Package for the Calculation of the Quasiparticle and Optical Properties of Materials and Nanostructures
- Geometric magic numbers of sodium clusters: Interpretation of the melting behaviour
- Plasmonic abilities of gold and silver spherical nanoantennas in terms of size dependent multipolar resonance frequencies and plasmon damping rates
- Photoabsorption by Volume Plasmons in Metal Nanoclusters
- Plasmonic excitations in quantum-sized sodium nanoparticles studied by time-dependent density functional calculations
- Temperature Dependence of the Optical Response of Small Sodium Clusters
- Study of volume and surface plasmons in small silicon-hydrogen nanoclusters by GW method