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Plasmon resonances (PRs) in metallic nanostructures have been extensively studied, whereas reports on PR in silicon nanowires (Si NWs) are very few, partial, and they refer to structures larger than 100 nm. Discrete resonances in Si NWs with core sizes as small as 30 nm at high resolution are observed. They are attributed to plasmonic resonances identifying two groups, the traveling waves, exhibiting discrete modes along the NW length for several orders of harmonics, and the localized waves, generated by transverse oscillations along the NW diameter, observing them to the best of our knowledge for the first time in silicon NWs (SiNWs) of every size. The experimental findings are coupled to modeling, confirming the data and adding further insights into the Si NW's embedding medium role. A plasmon‐induced resonant cavity in Si NWs opens markets in material processing, photodetectors, and novel …
Publication date: 
10 Oct 2021

Giovanni Borgh, Corrado Bongiorno, Antonino La Magna, Giovanni Mannino, Salvatore Patanè, Jost Adam, Rosaria Anna Puglisi

Biblio References: 
Pages: 2100130
Advanced Photonics Research