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Nanooptics of subnanometric plasmonic gaps

AuthorsAizpurua, Javier
Issue Date2015
Citation18th National Conference on Light Scattering (2015)
AbstractPlasmonic nanogaps are formed at the junction of two metallic interfaces providing a great opportunity to explore atomic-scale morphologies and complex photochemical processes by optical means, thanks to the excitation of 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. We exploit different classical and quantum theoretical approaches to address the scattering properties of metallic nanogaps where the separation distances are taken to the extreme, reaching Ångstrom-scale dimensions. Here we show the high sensitivity of plasmonic modes in gap antennas as well as in nanoparticle-on-a-mirror configurations (NPoM) when different testing samples and molecules are located in the gap. First we explore the limitations of classical descriptions to account for the fine details of electronic profiles and interactions at the Ångstrom scale, and then we introduce a quantum formalism that describes effects such as tunneling between particles across the gap, an effect that cannot be captured within classical approaches. The morphological aspects of the gap are crucial to determine the emergence of tunneling between particles as well as to define the threshold separation distances where strong nonlinear processes occur. Furthermore, we analyze how the crystallographic facets and vertices in nanogaps are able to provide peculiar scattering properties and extreme localization of near-fields, providing atomic-scale confinement of light, and thus explaining the resolutions achieved in a variety of experiments in field-enhanced spectroscopy and microscopy. The atomic scale is a challenging regime in nanooptics and plasmonics, progressively achieved experimentally. New theoretical tools, as the ones presented here, need to be introduced to understand this regime and implement new concepts in optical scattering and optoelectronics.
DescriptionResumen del trabjo presntado a la 18th National Conference on Light Scattering, celebrada en China del 22 al 25 de octubre de 2015.
Appears in Collections:(CFM) Comunicaciones congresos
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