Using holography to measure extinction
Using holography to measure extinction
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DOI：
10.1364/ol.39.003993
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发表时间：
2014-07-01
期刊：
影响因子：
3.6
通讯作者：
Fowler, Nicholas B.
中科院分区：
文献类型：
--
作者：
Berg, Matthew J.;Subedi, Nava R.;Fowler, Nicholas B.
本工作提出了一个新的概念，测量消光截面的单个粒子在现场。这个概念涉及到记录全息图，全息图是由粒子的前向散射光与入射光干涉产生的。这种干涉图样基本上与引起消光的能量流有关，并且通过对这种测量图样进行积分，可以获得横截面的近似值。米氏理论被用来表明，这种近似可以是小到1%的误差，为许多情况下的实际利益的真实值。此外，由于可以使用Fresnel-Kirchhoff衍射理论从测量的全息图计算重建颗粒的图像，因此可以同时获得颗粒的横截面以及颗粒的形状和尺寸。(C)2014年美国光学学会
This work presents a new concept to measure the extinction cross section for a single particle in situ. The concept involves recording the hologram produced by the interference of a particle's forward-scattered light with the incident light. This interference pattern is fundamentally connected to the energy flow that gives rise to extinction, and, by integrating this measured pattern, one obtains an approximation for the cross section. Mie theory is used to show that this approximation can be as little as 1% in error of the true value for many cases of practical interest. Moreover, since an image of the particle can be computationally reconstructed from a measured hologram using the Fresnel-Kirchhoff diffraction theory, one can obtain the cross section simultaneously with the particle shape and size. (C) 2014 Optical Society of America