Title :
Transient photostriction in Bi0.8La0.2Fe0.99Nb0.01O3 thin films modulated with strain
Author :
Zuanming Jin ; Yue Xu ; Zhengbing Zhang ; Xian Lin ; Guohong Ma ; Zhenxiang Cheng ; Xiaolin Wang
Author_Institution :
Dept. of Phys., Shanghai Univ., Shanghai, China
fDate :
June 30 2013-July 4 2013
Abstract :
The coherent longitudinal acoustic (LA) phonons in La and Nb codoped polycrystalline BiFeO3 (BLFNO) films are photo-induced and detected by the ultrafast reflectance spectroscopy. The generation mechanism of LA phonons is attributed to the transient photostriction effect, which is a combination of the optical rectification effect and the electrostriction effect. The strain modulation of sound velocity and out-of-plane elastic properties are demonstrated in BLFNO film on SrTiO3, which gives the insight into the dynamical coupling between electrical polarization and lattice deformation. Our findings are desired for the design of BiFeO3-based photo-driven remote control micro/nano devices.
Keywords :
acoustic wave velocity; bismuth compounds; elasticity; electrostriction; ferrites; high-speed optical techniques; lanthanum compounds; microwave spectra; millimetre wave spectra; multiferroics; phonons; stress effects; thin films; Bi0.8La0.2Fe0.99Nb0.01O3; BiFeO3-based photo-driven remote control microdevices; BiFeO3-based photo-driven remote control nanodevices; LA phonon generation mechanism; SrTiO3; codoped polycrystalline thin films; coherent longitudinal acoustic phonons; dynamical coupling; electrical polarization; electrostriction effect; lattice deformation; optical rectification effect; out-of-plane elastic properties; sound velocity; strain modulation; transient photostriction; ultrafast reflectance spectroscopy; Films; Oscillators; Phonons; Probes; Strain; Substrates; Transient analysis;
Conference_Titel :
Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2013 Conference on
Conference_Location :
Kyoto
DOI :
10.1109/CLEOPR.2013.6600519
