Optical wavelength dependence of photoacoustic signal of gold nanofluid

Year: 2020

Authors: Gandolfi M., Banfi F., Glorieux C.

Autors Affiliation: CNR, INO, Via Branze 45, I-25123 Brescia, Italy; Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; Katholieke Univ Leuven, Lab Soft Matter & Biophys, Dept Phys & Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium; Univ Cattolica Sacro Cuore, Dipartimento Matemat & Fis, Via Musei 41, I-25121 Brescia, Italy; Interdisciplinary Labs Adv Mat Phys I LAMP, Via Musei 41, I-25121 Brescia, Italy; Univ Claude Bernard Lyon 1, Univ Lyon, CNRS, FemtoNanoOpt Grp,Inst Lumiere Matiere, F-69622 Villeurbanne, France.

Abstract: We investigate the optical wavelength dependence of the photoacoustic (PA) signal, detected with bandwidth (BW) in the MHz range, of gold nanospheres (NSs) immersed in water upon illumination with ns laser pulses. We compare the wavelength dependence of the PA signal (within the MHz BW) with the one of the optical absorption coefficient as determined from optical transmission measurements. Thermal boundary conductance (TBC) at the gold-water interface is taken into account, as well as the temperature dependence of the thermal expansion coefficient of water. The effects of NS size and laser pulse duration on the PA signal are also explored. The PA signal is investigated with an opto-thermo-acoustic model considering light absorption in gold NS and in a surrounding water shell.

Journal/Review: PHOTOACOUSTICS

Volume: 20      Pages from: 100199-1  to: 100199-12

More Information: Christ Glorieux and Marco Gandolfi are grateful to the KU Leuven Research Council for financial support (C14/16/063 OPTIPROBE). Francesco Banfi acknowledges financial support from Universite de Lyon in the frame of the IDEXLYON Project-Programme Investissements d’Avenir (ANR-16-IDEX-0005) and from Universite Claude Bernard Lyon 1 thorugh the BQR Accueil EC 2019 grant. Marco Ganolfi acknowledges financial support from Universita Cattolica del Sacro Cuore in the frame of the dual supervision PhD. Francesco Banfi and Marco Gandolfi acknowledge financial support from the MIUR Futuro in ricerca Grant in the frame of the ULTRA – NANO Project (Project No. RBFR13NEA4). Marco Gandolfi acknowledges financial support from the CNR Joint Laboratories program 2019-2021.
KeyWords: Photoacoustic effect; Heat transfer; Absorption coefficient; Non-linearity; Kapitza resistance; Nanoparticles; Surface plasmon resonance
DOI: 10.1016/j.pacs.2020.100199

Citations: 27
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