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Driving plasmonics to the atomic scale

AuthorsAizpurua, Javier
Issue Date2017
CitationPlasmonica 2017
AbstractPlasmonic nanocavities are formed at the junction of two metallic interfaces and provide a great opportunity to explore atomic-scale morphologies and complex photochemical processes by optically monitoring the excitation of their intense surface plasmonic modes. In recent years, optical spectroscopy of these cavities has proven to be extremely sensitive to atomic-scale features that determine the chemistry and the optoelectronics in the gaps. Quantum theoretical approaches can be exploited to address the optics of metallic nanogaps when the separation distances are taken to the extreme, reaching Ångstrom-scale dimensions. In this regime, classical theories fail to address the fine details of the optical response, and more sophisticated quantum theories are needed. Several examples of how atomic features determine the optical response in plasmon-enhanced spectroscopy, and how they can set the performance of active control strategies in optoelectronic devices will be provided. The extreme subnanometric localization of light allows to understand ultraresolution in molecular vibrational spectroscopy, as recently achieved in intramolecule-resolved Surface-Enhanced Raman Spectroscopy. The small effective volumes associated to these new type of optical 'picocavities' are of particular interest in quantum nanooptics, as they provide particularly large values of the coupling strength of the photons in the cavity with excitons of an emitter, or with mechanical vibrations of a molecule located in the cavity. This opportunity of large coupling can be exploited in molecular optomechanics of single molecules.
DescriptionResumen del trabajo presentado a la Conferencia Plasmonica, celebrada en Lecce (Italia) del 5 al 7 de julio de 2017.
Appears in Collections:(CFM) Comunicaciones congresos
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