1207.5606 (B. Sturman et al.)

Metal nanoparticles with sharp corners: Universal properties of plasmon
resonances    [PDF]

B. Sturman, E. Podivilov, M. Gorkunov

We predict the simultaneous occurrence of two fundamental phenomena for metal nanoparticles possessing sharp corners: First, the main plasmonic dipolar mode experiences strong red shift with decreasing corner curvature radius; its resonant frequency is controlled by the apex angle of the corner and the normalized (to the particle size) corner curvature. Second, the split-off plasmonic mode experiences strong localization at the corners. Altogether, this paves the way for tailoring of metal nano-structures providing wavelength-selective excitation of localized plasmons and a strong near-field enhancement of linear and nonlinear optical phenomena.

View original: http://arxiv.org/abs/1207.5606