Optical wavelength dependence of photoacoustic signal of gold nanofluid

Abstract

Highlights Modelling of the photoacoustic effect of gold nanospheres dispersed in water and illuminated with ns laser pulses. Laser wavelength dependence of the photoacoustic signal. Comparison between the photoacoustic signal and the effective medium absorption coefficient. Non-linearity of photoacoustic signal due to temperature dependence of thermal expansion coefficient. Effect of nanosphere size and thermal boundary conductance on the photoacoustic signal magnitude and time evolution.

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