Metal nanoparticles with sharp corners: Universal properties of plasmon resonances
1 Institute of Automation and Electrometry, Russian Academy of Sciences - 630090 Novosibirsk, Russia
2 Institute of Crystallography, Russian Academy of Sciences - Leninskii pr. 59, 117333 Moscow, Russia
Received: 24 January 2013
Accepted: 24 February 2013
We predict the simultaneous occurrence of two fundamental phenomena for metal nanoparticles possessing sharp corners with variable curvature: First, the main dipolar plasmonic mode experiences a strong red shift with increasing corner curvature; for large values of the curvature, the resonant frequency is controlled by the apex angle of the corner. Second, the split-off plasmonic mode experiences a strong localization at the corners. Altogether, this paves the way for the tailoring of metal nanostructures providing a wavelength-selective excitation of localized plasmons and a strong near-field enhancement of linear and nonlinear optical phenomena.
PACS: 78.67.Uh – Nanowires / 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 42.25.Fx – Diffraction and scattering
© EPLA, 2013