Nonlocal Hydrodynamic Models for the Optical Response of Plasmonic Nanostructures

摘要

In order to model the interaction between lightand plasmonic structures at deep-nanometer scale, which isgoverned by non-classical effects, a nonlocal hydrodynamicapproach has been extensively studied. Several hydrodynamicmodels have been proposed, solving the coupled equations:the linearized hydrodynamic equation of motion and theelectrodynamic Maxwell’s equations, by employing additionalboundary conditions. This work compares four hydrodynamicmodels: the hard wall hydrodynamic model (HW-HDM),the curl-free hydrodynamic model (CF-HDM), the shearforces hydrodynamic model (SF-HDM), and the quantumhydrodynamic model (Q-HDM). The analysis is conducted fora metallic spherical nanoparticle, as an example. The abovehydrodynamic models are also compared with experimentsavailable in literature. It is demonstrated that HW-HDM and QHDMoutperform the other two hydrodynamic models.