Localized surface plasmon resonance (LSPR) or particle plasmon resonance (PPR) consists in a specific arrangement of metallic nanostructures in order to enhance their plasmonic response. This technique can lead to the development of high sensitivity bio-sensors but faces various difficulties on the fabrication side.
We investigate Laser Induced Periodic Surface Structuring (LIPSS) in order to produce sub micron periodic patterns on gold layer for localized plasmonic sensors fabrication. LIPSS are peri-odic structures that are generally created on a material surface by accumulation of ultra-short pulses exhibiting energies close to the material ablation threshold. Although LIPSS physical mechanisms are still under investigation, they have been induced in a wide variety of materials (metals, semicon-ductors, polymers, etc) for numerous applications such as realization of hydrophobic/hydrophilic surfaces, control of surface reflection or realization of low friction / high adhesion surfaces. Here we used ultrashort pulses (500 fs) at 515 nm to induce LIPSS structures on thin gold layers for LSPR sensors.
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