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Controlling and confining light by exciting plasmons in resonant metallicnanostructures is an essential aspect of many new emerging opticaltechnologies. Here we explore the possibility of controllably reconfiguring theintrinsic optical properties of semi-continuous gold films, by inducingpermanent morphological changes with a femtosecond (fs)-pulsed laser above acritical power. Optical transmission spectroscopy measurements show acorrelation between the spectra of the morphologically modified films and thewavelength, polarization, and the intensity of the laser used for alteration.In order to understand the modifications induced by the laser writing, weexplore the near-field properties of these films with electron energy-lossspectroscopy (EELS). A comparison between our experimental data and full-wavesimulations on the exact film morphologies hints toward a restructuring of theintrinsic plasmonic eigenmodes of the metallic film by photothermal effects. Weexplain these optical changes with a simple model and demonstrateexperimentally that laser writing can be used to controllably modify theoptical properties of these semi-continuous films. These metal films offer aneasy-to-fabricate and scalable platform for technological applications such asmolecular sensing and ultra-dense data storage.

Optical reconfiguration and polarization control in semi-continuous gold films close to the percolation threshold