Electronic Structure-Dependent Surface Plasmon Resonance in Single Au–Fe Nanoalloys

• DOI: 10.1021/acs.nanolett.9b02396
• Publication Date: 2019-07-26T22:22:48Z
• Authors: Duncan T. L. Alex...; Daniel Forrer; Enrico Rossi; Elefterios Lidorikis; Stefano Agnoli; Gabriel D. Bernas...; Jérémy Butet; Olivier J. F. Martin; Vincenzo Amendola
• Keywords: Noble metal; Localized surface plasmon

The relationship between composition and plasmonic properties in noble metal nanoalloys is still largely unexplored. Yet, of metals, such as gold, with transition elements, iron, have unique a number potential applications, ranging from nanomedicine to magneto-plasmonics plasmon-enhanced catalysis. Here, we investigate the localized surface plasmon resonance at level single Au-Fe nanoparticle by applying strategy that combines experimental measurements using near field electron energy loss spectroscopy theoretical studies via full wave numerical analysis density functional theory calculations electronic structure. We show that, iron fraction increases, blue-shifted significantly damped, consequence changes band structure alloy. This allows identification three relevant phenomena be considered design realization any nanoalloy, specifically: appearance new states around Fermi level; change free metal; blue shift interband transitions. Overall, this study provides opportunities for control optical response other nanoalloys, which are useful magneto-plasmonic devices molecular sensing, thermo-plasmonics, bioimaging, photocatalysis, amplification spectroscopic signals local enhancement.