Quantum mechanical study on plasmon resonances in small ring clusters

Abstract

The collectivity of the electronic motion in small sodium clusters with ring structure is studied by time-dependent density functional theory. The formation and development of collective resonances in the absorption spectra were obtained as a function of the ring radius. In small ring clusters, besides the lower-energy mode and the higher-energy mode, there is another plasmon resonance mode, that is, the reverse two-dipole mode. For the reverse two-dipole mode, the formations of these two dipoles are due to the external field inducement and the shielding effect, although the resonant excitation is mainly due to the coupling effect of the electrons of these two dipoles.

Plasmon Excitations in Mixed Metallic Nanoarrays

“…who showed that collective excitations exist even for very small clusters. More recent work addresses the mechanism of the collective excitations and field enhancement in higher dimension clusters using TD-DFT. − For example, Ma et al . studied the sensitivity of plasmon resonance in Au nanoparticles and their dimers as a function of the particle size and the interparticle distance .…”