Theory of light scattering by longitudinal-acoustic phonons in superlattices.
Theory of light scattering by longitudinal-acoustic phonons in superlattices.
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超晶格中纵向声声子的光散射理论。
DOI：
10.1103/physrevb.37.4086
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Sapriel
中科院分区：
文献类型：
--
作者：
He;Djafari;Sapriel
我们研究了沿无限超晶格轴传播的纵声声子对光的散射。与以往的工作不同，我们不仅考虑了两种介质的声学和光弹性参数之间的差异，而且考虑了它们的折射率之间的差异。在这种情况下，入射光和散射光在超晶格中用布洛赫波而不是平面波来表示。用传递矩阵法以封闭形式计算的散射强度对任何散射波矢量q值都有效，而不限于比布里渊区小的q值，即π/D。讨论了GaAs-AlAs超晶格的峰强度与组成、周期和光弹性参数的关系。结果可能与以往的工作有明显的差异，特别是在连续布里渊区边界附近的q。
We study the scattering of light by longitudinal-acoustic phonons propagating along the axis of an infinite superlattice. In contrast to previous works, we take into account not only the difference between the acoustic and photoelastic parameters of the two media, but also the difference between their refractive indexes. In this case the incident and scattered light in the superlattice are represented by Bloch waves instead of plane waves. The scattering intensities, calculated in closed form by using a transfer-matrix method, are then valid for any value of the scattering wave vector q and not limited to q values small compared with the size of the Brillouin zone, π/D. The peak intensities are discussed for GaAs-AlAs superlattices as functions of the composition, period, and photoelastic parameters. The results may show noticeable differences with those of the previous works, especially for q near the boundaries of the successive Brillouin zones.