Acoustic signals generated by laser-irradiated metal nanoparticles.
We present a physical model that explains several sequential stages of the conversion of optical to acoustical energy when irradiating diluted suspensions of metal nanoparticles with laser pulses. Optical absorption and scattering of a single particle driven by plasmon resonance interactions in an aqueous medium are considered. Thermal effects produced by laser-irradiated nanoparticles, dynamics of vapor bubble formation, and acoustic signals from expanding bubbles formed around heated nanoparticles are calculated. Stochastic features of the pressure magnitude emitted as a result of low-fluence irradiation of suspensions are also discussed. The probabilistic distribution of pressure magnitude from individual bubbles was found to obey Zipf's law for low concentrations of nanoparticles, while increasing their concentration brings the pressure magnitude distribution into conformance with the Gaussian law.
Egerev
Sergey
S
1Andreyev Acoustics Institute, Moscow 117630, Russia.
Ermilov
Sergey
S
Ovchinnikov
Oleg
O
Fokin
Andrey
A
Guzatov
Dmitry
D
Klimov
Vasily
V
Kanavin
Andrey
A
Oraevsky
Alexander
A
D000162:Acoustics; D006358:Hot Temperature; D007834:Lasers; D053768:Metal Nanoparticles / Q000528:radiation effects*; D008863:Microspheres; D008962:Models, Theoretical; D011312:Pressure