Femtosecond and picosecond near-field ablation of gold nanotriangles: nanostructuring and nanomelting |
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Authors: | A. Kolloch T. Geldhauser K. Ueno H. Misawa J. Boneberg A. Plech P. Leiderer |
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Affiliation: | (1) University of Konstanz, 78457 Konstanz, Germany;(2) Department of Chemistry, Northwestern University, Evanston, IL 60208-3113, USA |
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Abstract: | We report on recent insights into the interaction between ultra-fast laser pulses and plasmonic nanoparticles. We discuss femtosecond near-field ablation as a simple but versatile tool for the nanoscale modification of surfaces and the high-resolution measurement of a nanostructure’s near field. Two model systems are presented, illustrating the complexity of near-field distributions. Furthermore, finite difference time domain calculations in combination with absorption spectra provide a deeper insight into the factors influencing the near-field distribution. For the first time, an almost perfect agreement between the measured ablation pattern and experiment has been reached for gold triangles with a side length around 500 nm. Additionally, the results from picosecond laser irradiated plasmonic structures display a new regime of nanoscale laser material processing. We present first results showing nanometre confined melting induced by laser pulses. |
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