Revista Digital Universitaria ISSN: 1607 - 6079 | Publicación mensual | 1 de septiembre de 2015 vol.16, No.9
ABSTRACT
Interaction of light with metallic nanoparticles can be greatly enhanced if the incident electromagnetic wave is at resonance with collective electron excitations, which are called plasmons. Undoubtedly driven by the wide range of potential applications, plasmonics now is a flourishing field of fundamental and applied research. In particular, the possibility of actively controlling the plasmonic response at very short time scales. In this paper it is shown how to use the great near field enhancement in several nanostructures in which plasmonic nanocavities are formed, dimers with subnanometric distances between them and core-shell systems (nanomatryushkas) with decreasing separations up to less than 1 nm. At these distances we cannot describe neither the near field nor the far field classically and need to introduce quantum mechanics to explain tunneling through the narrow gaps as has been reported. The quantum corrected model (QCM, that describes the dielectric interfase as an effective medium which turns out conductive as the gaps become too small) (ESTEBAN et al., 2012) offers an accurate description of this effect and allows us to open a new development of devices that can be applied in Raman Spectroscopy.
Keywords: plasmons, metallic nanoparticles, nanocavities, nanotweezers, tunneling in nanosystems.
Subnanometric Plasmonics
Ángela Camacho BeltránKeywords: plasmons, metallic nanoparticles, nanocavities, nanotweezers, tunneling in nanosystems.