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Researchers at National Center for Scientific Research (CNRS) Report New Data on General Science (Giant ultrafast photo-induced shear strain in...

September 5, 2014



Researchers at National Center for Scientific Research (CNRS) Report New Data on General Science (Giant ultrafast photo-induced shear strain in ferroelectric BiFeO3)

By a News Reporter-Staff News Editor at Science Letter -- Fresh data on Science are presented in a new report. According to news reporting originating in Le Mans, France, by NewsRx journalists, research stated, "Generation of strain using light is a key issue for future development of ultrasonic devices. Up to now, photo-induced GHz-THz acoustic phonons have been mainly explored in metals and semiconductors, and in artificial nanostructures to enhance their phononic emission."

The news reporters obtained a quote from the research from National Center for Scientific Research (CNRS), "However, despite their inherent strong polarization (providing natural asymmetry) and superior piezoelectric properties, ferroelectric oxides have been only poorly regarded. Here, by using ultrafast optical pump-probe measurements, we show that photogeneration/photodetection of coherent phonons in BiFeO3 ferroelectric leads, at room temperature, to the largest intensity ratio ever reported of GHz transverse acoustic wave versus the longitudinal one. It is found that the major mechanism involved corresponds to screening of the internal electric fields by light-induced charges, which in turn induces stress by inverse piezoelectric effect."

According to the news reporters, the research concluded: "This giant opto-acoustic response opens new perspectives for the use of ferroelectric oxides in ultrahigh frequency acoustic devices and the development of new GHz-THz acoustic sources."

For more information on this research see: Giant ultrafast photo-induced shear strain in ferroelectric BiFeO3. Nature Communications, 2014;5():4301. (Nature Publishing Group - www.nature.com/; Nature Communications - www.nature.com/ncomms/)

Our news correspondents report that additional information may be obtained by contacting M. Lejman, Institut des Molecules et Materiaux du Mans, UMR CNRS 6283, Universite du Maine, Av O Messiaen, 72085 Le Mans, France. Additional authors for this research include G. Vaudel, I.C. Infante, P. Gemeiner, V.E. Gusev, B. Dkhil and P. Ruello (see also Science).

Keywords for this news article include: France, Europe, Le Mans, Science.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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