Scattering rings in optically anisotropic porous silicon
Scattering rings in optically anisotropic porous silicon
复制标题
光学各向异性多孔硅中的散射环
DOI：
10.1063/1.1531834
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发表时间：
2002
影响因子：
4
通讯作者：
Lorenzo Pavesi
中科院分区：
文献类型：
--
作者：
C. Oton;Z. Gaburro;M. Ghulinyan;L. Pancheri;P. Bettotti;L. D. Negro;Lorenzo Pavesi
报道了激光斜入射到(100)取向多孔硅层上的强各向异性散射现象。散射光形成与入射和反射光束相切的圆锥体。圆锥形图案是由于散布在垂直孔壁上形成的，孔壁沿层厚呈直线分布。光锥在垂直于锥轴的屏幕上限定结构光环。用多孔硅的光学各向异性解释了多孔硅的各种结构。对于被分析的样品，我们直接从环图案测量正双折射的Δn/Nord=8%值。
We report the observation of strongly anisotropic scattering of laser light at oblique incidence on a (100)-oriented porous silicon layer. The scattered light forms cones tangent to the incident and reflected beams. The conical pattern is caused by scattering on the vertical walls of pores, which are straight along the layer thickness. The light cone defines structured light rings onto a screen normal to the cone axis. We explain the various structures by optical anisotropy of porous silicon. For the sample under analysis, we directly measure from the ring patterns a value of Δn/nord=8% of positive birefringence.