Ultrafast zone-center coherent lattice dynamics in ferroelectric lithium tantalate

Jianbo Hu; Oleg V Misochko; Hiroshi Takahashi; Hiroaki Koguchi; Takayuki Eda; Kazutaka G Nakamura

doi:10.1088/1468-6996/12/3/034409

Ultrafast zone-center coherent lattice dynamics in ferroelectric lithium tantalate

Sci Technol Adv Mater. 2011 Jun 16;12(3):034409. doi: 10.1088/1468-6996/12/3/034409. eCollection 2011 Jun.

Authors

Jianbo Hu¹, Oleg V Misochko², Hiroshi Takahashi³, Hiroaki Koguchi³, Takayuki Eda³, Kazutaka G Nakamura³

Affiliations

¹ Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan; CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan; Institute of Fluid Physics, Chinese Academy of Engineering Physics, PO Box 919-102, Mianyang, Sichuan 621900, Peoples Republic of China.
² Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow region, Russia.
³ Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan; CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan.

Abstract

Femtosecond time-resolved pump-probe experiments were carried out to study ultrafast lattice dynamics of ferroelectric lithium tantalate. Both the fully symmetric (A₁ mode) and doubly degenerate (E mode) coherent phonons at the center of the Brillouin zone were excited via impulsive stimulated Raman scattering, as confirmed by the excitation intensity dependence.

Keywords: ISRS; coherent phonon; lithium tantalate.