School of Physics, Monash University, Victoria 3800, Australia.
Opt Lett. 2013 Jun 1;38(11):1808-10. doi: 10.1364/OL.38.001808.
We present an analytical approach to describe field propagation along a planar x-ray waveguide (WG) in the presence of absorption losses. The method utilizes the complete expression for the complex index of refraction in solving the Helmholtz equation describing the guided modes. In this way, the propagation modes for the WG are no longer imposed to be standing waves and the energy flow from the core to the cladding, a consequence of the absorption in the cladding, can be calculated. In addition, the method accurately describes the field coupling between a plane wave and the WG, reproducing the self-imaging phenomenon. The case of partially coherent illumination has also been calculated for a realistic laboratory x-ray source.
我们提出了一种分析方法来描述存在吸收损耗时沿平面 X 射线波导 (WG) 的场传播。该方法利用描述导模的亥姆霍兹方程的复折射率的完整表达式来求解。通过这种方式，不再要求 WG 的传播模式为驻波，并且可以计算出由于包层中的吸收而从芯层到包层的能量流。此外，该方法准确地描述了平面波与 WG 之间的场耦合，再现了自成像现象。还针对现实实验室中的 X 射线源计算了部分相干照明的情况。
