Toward laser-induced tuning of plasmonic response in high aspect ratio gold nanostructures

Abstract High aspect-ratio gold nanostructures sustain Fabry–Perot-like surface plasmon responses from infrared to visible light energies. We show that some resonances can be tuned by means of laser irradiation, where low energy modes stay unperturbed. After nanowires’ tips are transformed into nanoparticles various sizes joint nanowires, producing high half-dumbbells and dumbbells structures. The plasmonic behaviour both the nanowires newly created has been characterised in-depth monochromated electron loss spectroscopy (EELS) developed in a transmission microscope (TEM) state-of-the-art discrete dipole approximation (DDA) calculations. All these analyses serve as experimental proof selective tuning (or robustness) specific spectral range, which is critical interest regarding applications for sensing devices, nano-sources or nanophotonic waveguide, well optical remote control.