Maluenda David, Aviñoá Marcos, Ahmadi Kavan, Martínez-Herrero Rosario, Carnicer Artur
Departament de Física Aplicada, Universitat de Barcelona (UB), Martí i Franquès 1, 08028, Barcelona, Spain.
Departamento de Óptica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Ciudad Universitaria, 28040, Madrid, Spain.
Sci Rep. 2021 Sep 9;11(1):17992. doi: 10.1038/s41598-021-97164-z.
The detection of the longitudinal component of a highly focused electromagnetic beam is not a simple task. Although in recent years several methods have been reported in the literature, this measure is still not routinely performed. This paper describes a method that allows us to estimate and visualize the longitudinal component of the field in a relatively simple way. First, we measure the transverse components of the focused field in several planes normal to the optical axis. Then, we determine the complex amplitude of the two transverse field components: the phase is obtained using a phase recovery algorithm, while the phase difference between the two components is determined from the Stokes parameters. Finally, the longitudinal component is estimated using the Gauss's theorem. Experimental results show an excellent agreement with theoretical predictions.
检测高度聚焦电磁束的纵向分量并非易事。尽管近年来文献中已报道了几种方法，但这种测量仍未常规进行。本文描述了一种方法，该方法使我们能够以相对简单的方式估计并可视化场的纵向分量。首先，我们在几个垂直于光轴的平面中测量聚焦场的横向分量。然后，我们确定两个横向场分量的复振幅：相位通过相位恢复算法获得，而两个分量之间的相位差则由斯托克斯参数确定。最后，使用高斯定理估计纵向分量。实验结果与理论预测吻合良好。
