Plasmonics has been a focus point of recent research [1], mainly for its broad range of applications [2]. Within plasmonics, the study and tuning of localized surface plasmon resonances (LSPRs) in metallic nanowires (NW) has been deemed important due to their applications ranging from photonics to electronics, sensors [3], or even chemical analysis through surface-enhanced light spectroscopies [4]. Recent works showing it is possible modify the morphology of these NW by laser irradiation, provide a new realm of high aspect-ratio nanostructures with potential new properties [5].<br/>Low-loss electron energy loss spectroscopy (EELS) is a very adequate tool to characterise these nanostructures, combining both spatial resolution and spectral resolution [6]. Our EELS studies, combined with discrete dipole approximation modelling, show how the plasmonic response of high aspect-ratio Au 1D nanostructures can be tuned by means of nanoparticles attached to the tips of gold NW, that is, high aspect-ratio half-dumbbells and dumbbells. The investigation of the surface plasmon resonances has been developed using component analysis on the EELS spectrum images, see Fig. 1. These studies shed light on the properties of this kind of nanostructures and their potential tuning, enhancing their potential future applications [7,8].

Tuning of plasmonic response in high aspect-ratio Au nanowires through laser irradiation: An EELS study

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