Studying Ultrafast Relaxation Processes in Ag Nanocubes
Noble metal nanoparticles patterned in ordered arrays interact and generate plasmonic surface lattice resonances. Up to now, the assumption was that such nanoparticles are static. But researchers from the Kaunas University of Technology in Lithuania have demonstrated that this is not the case at ultrafast time scales. They used Transient Absorption Spectroscopy (TAS) to study the ultrafast relaxation processes in Ag nanocubes.
To read their paper is entitled, “Effect of Ag Nanocube Optomechanical Modes on Plasmonic Surface Lattice Resonances,” click here.
Light Conversion Equipment in Experimental Setup
The researchers used TAS to investigate ultrafast relaxation processes in Ag nanocubes (both in solution and regular 2-D structures). A HARPIA spectrometer built by Light Conversion was used for the TAS measurements. The samples were excited using a PHAROS ultrafast Yb:KGW laser (Light Conversion) with a regenerative amplifier at a 66.7 kHz repetition rate and 290 fs duration pulses at 1030 nm wavelength. The pump beam wavelength was tuned with a collinear optical parametric generator ORPHEUS and harmonic generator LYRA (Light Conversion) to 350 nm and an energy density of 40 μJ/cm2.
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