2019/08/02 by Céline Molinaro, Molinaro, Céline, Sylvie Marguet +7
Biochemistry, Genetics and Molecular Biology · Engineering · Materials Science · #FOS: Physical sciences #Gold and Silver Nanoparticles Synthesis and Applications #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Nonlinear Optical Materials Studies #Optics (physics.optics) #Protein Interaction Studies and Fluorescence Analysis #Quantum Dots Synthesis And Properties
paper · pdf · doi:10.48550/arxiv.1908.00859
openalex publication_date 2019/08/02 · openalex created_date 2022/07/28 · openalex updated_date 2026/07/28
The two-photon luminescence (TPL) of gold nanoparticles (NP) was shown to\nresult from the excitation of hot carriers, the plasmonic NP resonances playing\nan important role both for plasmon enhanced absorption and plasmon enhanced\nemission. However, the exact parameters enabling to control or optimize the NP\nnonlinear luminescence still need to be understood in detail. In this paper, we\nreport the two-photon excited photoluminescence of single gold nanorods\nexhibiting identical aspect ratio (close to 4) and thus identical plasmonic\nresonances, but increasing volumes V (707 <V< 160 103 nm3 i.e. rod diameters\nvarying between 6 and 40 nm). The two-photon luminescence intensity of a high\nnumber of colloidal nanorods was investigated at the single object level,\ncombining polarization resolved TPL and simultaneously acquired topography.\nNon-monotonic TPL variations are evidenced, nanorods with an intermediate size\n(diameter around 10 nanometers) exhibiting the highest TPL signal intensity. A\nmodel is proposed considering both the local field enhancement effects at the\nNP and the size-dependent electron thermalization processes. BEM (Boundary\nElements Method) simulations are used to compute the fields at both the\ntransverse and longitudinal plasmon resonance. A good fitting of the\nexperimental data is obtained considering integration of the fields over the\nwhole the NP volume.\n