Coherent Brillouin spectroscopy in a strongly scattering liquid by picosecond ultrasonics

• Main Authors: Maznev, Alexei (Contributor), Manke, Kara Jean (Contributor), Klieber, Christoph (Contributor), Nelson, Keith Adam (Contributor), Baek, S. H. (Author), Eom, Chang-Beom (Author)
• Other Authors: Massachusetts Institute of Technology. Department of Chemistry (Contributor), Massachusetts Institute of Technology. Department of Materials Science and Engineering (Contributor)
• Format: Article
• Language: English
• Published: Optical Society of America, 2013-11-21T20:37:11Z.
• Subjects: Article
• Online Access: Get fulltext

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 nm thick single crystal SrRuO[subscript 3] transducer film, is tested on a full fat milk sample, with 11 GHz acoustic frequency recorded.
United States. Dept. of Energy (DOE grant DE-FG02-00ER15087)
National Science Foundation (U.S.) (grant IMR- 0414895)
United States. Army Research Office (Institute for Soldier Nanotechnologies, contract DAAD-19-02- D-0002)
United States. Army Research Office (grant W911NF-10-1- 0362)