In a modification of a picosecond ultrasonic technique, a short acoustic pulse is launched into a liquid sample by a laser pulse absorbed in a semitransparent transducer film and is detected via coherent Brillouin scattering of a time-delayed probe pulse. With both excitation and probing performed from the transducer side, the arrangement is suitable for in vivo study of biological tissues. The signal is collected from a micrometer-thick layer next to the transducer and is not affected by the diffuse scattering of probe light deeper in the sample. The setup, utilizing a $33\mathrm{nm}$ thick single crystal ${\mathrm{SrRuO}}_3$ transducer film, is tested on a full fat milk sample, with $11\mathrm{GHz}$ acoustic frequency recorded.

© 2011 Optical Society of America

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