title: Azobenzene - functionalized polyelectrolyte nanolayers as ultrafast optoacoustic transducers.
abstract: We introduce azobenzene-functionalized polyelectrolyte multilayers as efficient, inexpensive optoacoustic transducers for hyper-sound strain waves in the GHz range. By picosecond transient reflectivity measurements we study the creation of nanoscale strain waves, their reflection from interfaces, damping by scattering from nanoparticles and propagation in soft and hard adjacent materials like polymer layers, quartz and mica. The amplitude of the generated strain ε∼ 5 × 10(-4) is calibrated by ultrafast X-ray diffraction.
authors.affiliation: Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany. bargheer@uni-potsdam.de.
authors.forename: E S
authors.initials: ES
authors.lastname: Pavlenko
authors.forename: M
authors.initials: M
authors.lastname: Sander
authors.forename: S
authors.initials: S
authors.lastname: Mitzscherling
authors.forename: J
authors.initials: J
authors.lastname: Pudell
authors.forename: F
authors.initials: F
authors.lastname: Zamponi
authors.forename: M
authors.initials: M
authors.lastname: Rössle
authors.forename: A
authors.initials: A
authors.lastname: Bojahr
authors.forename: M
authors.initials: M
authors.lastname: Bargheer