fig3

Figure 3. Electronic structure and plasmonic responses relevant to interband/intraband transitions. (A) Density-of-states schematic of a plasmonic (noble) metal and the corresponding E-k band diagram highlighting (i) intraband s → s acceleration and (ii) interband d → s transitions relative to E_F^[57]. Copyright 2018, reproduced with permission. Published by Wiley-VCH; (B) Absorbance spectra of plasmonic Cu and Au nanoparticles^[60]. Copyright 2019, reproduced with permission. Published by the Royal Society of Chemistry. (C) Extinction spectra calculated for Au, Ag, and Cu nanospheres in water using COMSOL (points) and compared with Mie-theory results (solid lines) (upper). Extinction spectra highlighting multipole contributions (lower)^[63]. Copyright 2016, reproduced with permission. Published by the Institute of Physics, Polish Academy of Sciences.