Laplacian-Level Quantum Hydrodynamic Theory for Plasmonics

  title={Laplacian-Level Quantum Hydrodynamic Theory for Plasmonics},
  author={Henrikh M. Baghramyan and Fabio Della Sala and Cristian Cirac{\`i}},
  journal={arXiv: Mesoscale and Nanoscale Physics},
An accurate description of the optical response of subwavelength metallic particles and nanogap structures is a key problem of plasmonics. Quantum hydrodynamic theory (QHT) has emerged as a powerful method to calculate the optical response of metallic nanoparticles since it takes into account nonlocality and spill-out effects. Nevertheless, the absorption spectra of metallic particles from QHT is affected, at energies higher than the main plasmon peak, by several additional peaks, which are… 

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