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本文利用反射式飞秒抽运-探测技术，系统研究了飞秒激光诱导La和Nb共掺杂的铁酸铋（Bi0.8La0.2Fe0.99Nb0.01O3）薄膜中纵向声学声子的动力学过程，声学声子的产生源于光致应变效应. 实验发现不同的衬底（ZrO2和PbMg1/3Nb2/3-PbTiO3）可以调制外延生长的Bi0.8La0.2Fe0.99Nb0.01O3薄膜的面外弹性系数C. 此外，通过对压电晶体衬底PbMg1/3Nb2/3-PbTiO3外加电压，实现了对薄膜应力的调制.
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关键词:
- 飞秒抽运-探测技术 /
- Bi0.8La0.2Fe0.99Nb0.01O3薄膜 /
- 声学声子 /
- 应力调控
Coherent longitudinal acoustic phonons in Bi0.8La0.2Fe0.99Nb0.01O3 (BLFNO) films are photo-induced and detected by the femtosecond time-resolved reflectance spectroscopy. The generation mechanism of coherent longitudinal acoustic phonons is attributed to the transient photostriction effect. The strain modulation of the out-of-plane elastic properties C is realized in BLFNO films deposited on different substrates (ZrO2 and PbMg1/3Nb2/3-PbTiO3). Strain modulation of the thin film is demonstrated by applying an electromotive force on the piezoelectric substrate PbMg1/3Nb2/3-PbTiO3.-
Keywords:
- femtosecond pump-probe technology /
- Bi0.8La0.2Fe0.99Nb0.01O3 thin film /
- acoustic phonon /
- strain modulation
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中国物理学会期刊
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