Institut Langevin, ESPCI ParisTech, PSL Research University, CNRS UMR 7587, 1 rue Jussieu, 75005 Paris, France.
Phys Rev Lett. 2015 Jan 16;114(2):023901. doi: 10.1103/PhysRevLett.114.023901. Epub 2015 Jan 12.
We report on the passive measurement of time-dependent Green's functions in the optical frequency domain with low-coherence interferometry. Inspired by previous studies in acoustics and seismology, we show how the correlations of a broadband and incoherent wave field can directly yield the Green's functions between scatterers of a complex medium. Both the ballistic and multiple scattering components of the Green's function are retrieved. This approach opens important perspectives for optical imaging and characterization in complex scattering media.
我们报告了在光学频域中利用低相干干涉测量进行随时间变化的格林函数的被动测量。受先前在声学和地震学中的研究的启发，我们展示了宽带和非相干波场的相关性如何能直接给出复杂介质中散射体之间的格林函数。格林函数的弹道和多次散射分量都被恢复。这种方法为复杂散射介质中的光学成像和特性描述开辟了重要的前景。
