Abstract
Gas cluster ion beam sputtering has been used to study the self-organising behaviour of In metallic nanoparticles produced by preferential sputtering of phosphorus atoms in InP. Discrete plasmonic In nanoparticles are observed at the earliest stages of surface modification. The surfaces have been investigated in situ by reflection electron energy loss spectroscopy, Auger electron spectroscopy, and photoluminescence spectroscopy. By altering the excitation intensity, we observe alterations of the photoluminescence spectrum that are attributed to photoconductive-coupling between In nanoparticles. The devices presented are suitable for visible wavelength surface enhanced Raman spectroscopy and, potentially, offer a route to active all-optical switches.
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