论文标题
通过相互散射在不透明的介质中感知单个散射器的位置
Sensing the position of a single scatterer in an opaque medium by mutual scattering
论文作者
论文摘要
我们研究了相互散射的潜力，即具有多个正确阶段的入射光束的光散射，作为一种从不透明物体内部提取结构信息的方法。特别是，我们研究了如何在许多类似散射器（最多$ n = 1000 $）的光学致密样本中检测到单个散射器的位移。通过对许多点散射器的集合进行确切的计算，我们可以比较响应于随机分布的相似偶极子的配置中的单个偶极子的位置的变化，比较了众所周知的差分横截面（来自一个梁）。我们的数值示例表明，相互散射提供的斑点模式具有角度灵敏度至少比传统的一光束技术高10倍。通过研究相互散射的“敏感性”，我们证明了确定不透明样品中移位偶极子入射表面的原始深度的可能性。此外，我们表明相互散射提供了一种确定复杂散射幅度的新方法。
We investigate the potential of mutual scattering, i.e., light scattering with multiple properly phased incident beams, as a method to extract structural information from inside an opaque object. In particular, we study how sensitively the displacement of a single scatterer is detected in an optically dense sample of many (up to $N=1000$) similar scatterers. By performing exact calculations on ensembles of many point scatterers, we compare the mutual scattering (from two beams) and the well-known differential cross-section (from one beam) in response to the change of location of a single dipole inside a configuration of randomly distributed similar dipoles. Our numerical examples show that mutual scattering provides speckle patterns with an angular sensitivity at least 10 times higher than the traditional one-beam techniques. By studying the "susceptivity" of mutual scattering, we demonstrate the possibility to determine the original depth relative to the incident surface of the displaced dipole in an opaque sample. Furthermore, we show that mutual scattering offers a new approach to determine the complex scattering amplitude.
