Formation of normal surface plasmon modes in small sodium nanoparticles

• DOI: 10.1039/d0cp00323a
• Publication Date: 2020-06-05T15:23:57Z
• Authors: N. L. Matsko
• Keywords: Localized surface plasmon

Formation of surface plasmon modes in sodium nanoclusters containing 20-300 atoms was studied using the GW method. It is shown that small Na nanoparticles up to 2 nm size, loss function $Im[\epsilon^{-1}]$ dominated by a single peak corresponding localized resonance (LSPR). For particles and more, polariton (SPP) oscillations begins form, as well volume (VP) excitations. Considering above, linear size particle range 0.7-3.7 can be estimated lower limit for metal nanodevices operating with SPP. On example spherical consisting silicon core coated atoms, it LSPR mode selectively suppressed while SPP not. Such composite structures considered an nanoplasmonic devices tuned characteristics.