Near-field marking of gold nanostars by ultrashort pulsed laser irradiation: experiment and simulations

• DOI: 10.1007/s00339-018-1615-4
• Publication Date: 2018-02-05T01:33:32Z
• Authors: Søren H. Møller; Joakim Vester-Pet...; Adnan Nazir; Emil H. Eriksen; Brian Julsgaard; Søren P. Madsen; Peter Balling
• Keywords: PLASMON RESONANCE; 0103 physical sciences; NANOPARTICLES; ENHANCED RAMAN-SCATTERING; 02 engineering and technology; REFRACTIVE-INDEX; 0210 nano-technology; NANOSTRUCTURES; 01 natural sciences

Quantitative measurements of the electric near-field distribution of star-shaped gold nanoparticles have been performed by femtosecond laser ablation. Measurements were carried out on and off the plasmon resonance. A detailed comparison with numerical simulations of the electric fields is presented. Semi-quantitative agreement is found, with slight systematic differences between experimentally observed and simulated near-field patterns close to strong electric-field gradients. The deviations are attributed to carrier transport preceding ablation.