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首页> 外文期刊>Journal of Applied Physics >Mechanism of the electro-optic effect in the perovskite-type ferroelectric KNbO_3 and LiNbO_3
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Mechanism of the electro-optic effect in the perovskite-type ferroelectric KNbO_3 and LiNbO_3

机译:钙钛矿型铁电体KNbO_3和LiNbO_3的电光效应机理

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摘要

Based on the theoretical model published by Chen et al. [Chem. Phys. Lett. 397, 222 (2004)], we present an efficient scheme for studying the mechanism of the electro-optic (EO) effect in perovskite-type ferroelectrics employing the electronic density-functional theory and the generalized gradient approximation. The results show that the main contribution to the EO effect in KNbO_3 and LiNbO_3 crystals comes from the relative displacements of the central metal ion and oxygen in the NbO_6 oxygen octahedron induced by a low frequency applied electric field. These displacements change the band wave functions of the electrons in the crystals through electron-phonon coupling, which then affects the electronic response of the lattice to the incident optical wave (i.e., induces a change of refractive index). Furthermore, the relationship between the microstructure of perovskite-type ferroelectrics and the clamped EO effect and the physical meaning of the parameter β_k(ij) published by Chen et al. are explained.
机译:基于Chen等人发表的理论模型。 [化学。物理来吧397,222(2004)],我们提出了一种有效的方案,利用电子密度泛函理论和广义梯度近似方法研究了钙钛矿型铁电体中电光(EO)效应的机理。结果表明,KNbO_3和LiNbO_3晶体对EO效应的主要贡献来自低频施加电场在NbO_6氧八面体中中心金属离子和氧的相对位移。这些位移通过电子-声子耦合改变了晶体中电子的带波函数,这随后影响了晶格对入射光波的电子响应(即,引起了折射率的改变)。此外,Chen等人发表的钙钛矿型铁电体的微观结构与受限制的EO效应以及参数β_k(ij)的物理意义之间的关系。解释。

著录项

  • 来源
    《Journal of Applied Physics》 |2007年第10期|p.103506.1-103506.6|共6页
  • 作者单位

    Beijing Center for Crystal R & D, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, P.O. Box 2711, Beijing 100080, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用物理学;计量学;
  • 关键词

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