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Driving nanophotonics to the atomic scale

AuthorsAizpurua, Javier
Issue Date2017
CitationNanoSpain (2017)
AbstractPlasmonic nanocavities formed at the junction of two metallic interfaces provide a great platform 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. In this regime, classical theories fail to address the fine details of the optical response, and more sophisticated quantum theories are needed. We develop a quantum atomistic description of the total energy and the optical response of metallic nanojunctions within Time-dependent Density Functional Theory (TDDFT) that allows to properly address atomic-scale features of the field enhancement and localization of light at the gap, providing new keys to understand the ultraresolution obtained in molecular vibrational spectroscopy. The small effective volumes associated to these new type of optical 'pico-cavities' are of particular interest in quantum nanooptics, as they provide large values of the coupling strength between the photons in the cavity and excitons of an emitter or mechanical vibrations of a molecule. We exploit this opportunity of large coupling in molecular optomechanics of single molecules. The atomic scale is a challenging regime in plasmonics, progressively achieved experimentally. New theoretical tools, as those pointed out here, become necessary to understand this regime, and implement new concepts in optoelectronics, quantum nanooptics, and field-enhanced spectroscopy.
DescriptionResumen del trabajo presentado a la NanoSpain Conference, celebrada en San Sebastián del 7 al 10 de marzo de 2017.
Appears in Collections:(CFM) Comunicaciones congresos
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