Nonlocal hydrodynamic Drude resonances of nano-plasmonic scatterers: Modeling and simulations

As the plasmonic scatterers get much smaller than the wavelength of the incident light, local material models like the Drude model and the Lorentz model become inadequate to describe accurately the light-matter interactions. To overcome this, a sophisticated nonlocal hydrodynamic Drude model is investigated. In practice, it is further simplified and simulated with the curl-free approximation, which generates spurious resonances. In this work we discuss a weak formulation based rigorous numerical investigations of the nonlocal hydrodynamic Drude model. This approach does not use the curl-free approximation, and thus avoids spurious resonances. The simulated results agree good with Mie results, and the method is capable of handling arbitrarily shaped scatterers.