Study on the nonlocal surface plasmon resonance properties of Au nanotubes

The optical properties of nanostructures with nonlocal effects is analysied by the finite element method method. The nonlocal effects can be described by a spatially nonlocal dielectric function with Drude model plus two Lorentz pole oscillator dielectric model. The optical properties of Au nanotubes with different radii, distance of junctions, can be determined by tuning the corresponding parameters to obtain the remarkable nonlocal effects, which should be taken into consideration in real optical device design. Our results can be used as a reference in design of realistic sub-wavelength devices.