Microscopic model of IR properties of MgO nanoparticles : size effects

Abstract : We assess the validity of macroscopic electrodynamics at the nanoscale by studying the IR properties of MgO nanoparticles. The absorption spectrum is computed using a numerical solution of Maxwell equations with a local macroscopic dielectric constant. The result is compared with an absorption spectrum obtained using molecular dynamics simulation. Significant differences are reported and we find evidence of the presence of non-local effects. This indicates that a local macroscopic model is not valid at the nanoscale. One of the key issues in nanophotonics is the validity of macroscopic electrodynamics at nanoscale. Most theoretical approaches dealing with light-matter interaction at nanoscale
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Yann Chalopin, Hichem Dammak, Marc Hayoun, Mondher Besbes, Jean-Jacques Greffet. Microscopic model of IR properties of MgO nanoparticles : size effects. Applied Physics Letters, American Institute of Physics, 2012, 100 (24), ⟨10.1063/1.4729384⟩. ⟨hal-01932797⟩

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