Institut Langevin, ESPCI ParisTech, CNRS UMR 7587, Universités Paris VI & VII, INSERM, 10 rue Vauquelin, 75231 Paris Cedex 05, France.
Phys Rev Lett. 2011 Dec 23;107(26):263901. doi: 10.1103/PhysRevLett.107.263901. Epub 2011 Dec 22.
We report on the experimental measurement of the backscattering matrix of a weakly scattering medium in optics, composed of a few dispersed gold nanobeads. The decomposition of the time-reversal operator is applied to this matrix and we demonstrate selective and efficient focusing on individual scatterers, even through an aberrating layer. Moreover, we show that this approach provides the decomposition of the scattering pattern of a single nanoparticle. These results open important perspectives for optical imaging, characterization, and selective excitation of nanoparticles.
我们报告了在光学中对由少量分散的金纳米珠组成的弱散射介质的后向散射矩阵的实验测量。时间反演算子的分解应用于该矩阵，我们证明了即使在存在像差层的情况下，对单个散射体的选择性和有效聚焦。此外，我们表明，这种方法提供了单个纳米粒子的散射模式的分解。这些结果为光学成像、纳米粒子的特性和选择性激发开辟了重要的前景。
