Abstract
Ultraviolet plasmonics (UV) has become an active topic of research due to the new challenges arising in fields such as biosensing, chemistry or spectroscopy. Recent studies have pointed out aluminum, gallium, magnesium and rhodium as promising candidates for plasmonics in the UV range. Aluminum and magnesium present a high oxidation tendency that has a critical effect in their plasmonic performance. Nevertheless, gallium and rhodium have drawn a lot of attention because of their low tendency of oxidation and, at the same time, good plasmonic response in the UV and excellent photocatalytic properties. Here, we present a short overview of the current state of UV plasmonics with the latest findings in the plasmonic response and applications of aluminum, gallium, magnesium and rhodium nanoparticles.
Highlights
In the last two decades, nanoplasmonics has experienced a huge impulse from both theoretical and experimental points of view. This branch of nanophotonics studies the distribution of the electromagnetic field, and its local charge resonances (Localized Surface Plasmon Resonances, LSPRs) in sub-wavelength metallic nanostructures
The plasmonic response of Al and Mg is completely deteriorated by the formation of the oxide layer, specially in the case of Mg, for which the metal content drops to 0% after oxidation
Ultraviolet plasmonics (UV) plasmonics constitutes a new focus of research due to new challenges arising in fields such as biology, chemistry or spectroscopy
Summary
In the last two decades, nanoplasmonics has experienced a huge impulse from both theoretical and experimental points of view This branch of nanophotonics studies the distribution of the electromagnetic field, and its local charge resonances (Localized Surface Plasmon Resonances, LSPRs) in sub-wavelength metallic nanostructures. Knowing how this oxide shell affects the plasmonic behavior of this type of NPs is a key point for researchers in UV plasmonics [22,23,24] It will be addressed in the two sections for the four most significant metals able to sustain UV LSPRs. It is worth mentioning that materials with UV plasmonic response can be achieved by alloying elemental materials [25]. We present some examples of local-field cooperative effects in dimers
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