Spatio-temporal focusing of an ultrafast pulse through a multiply scattering medium
Spatio-temporal focusing of an ultrafast pulse through a multiply scattering medium
复制标题
DOI：
10.1038/ncomms1434
复制
发表时间：
2011-08-01
影响因子：
16.6
通讯作者：
Chatel, Beatrice
中科院分区：
文献类型：
--
作者：
McCabe, David J.;Tajalli, Ayhan;Chatel, Beatrice
通过多重散射介质传播的光脉冲经历复杂的空间和时间畸变以形成熟悉的散斑图案。散斑的基本性质和散射介质后的空间和时间重聚焦的挑战是当前的研究热点。在这里，我们报告的空间和时间分辨测量产生的散斑场的超快光脉冲通过厚的强散射介质的传播。通过使用光谱相位滤波器塑造脉冲的时间轮廓，我们展示了输出散斑到傅里叶极限持续时间的空间局部化时间再压缩，提供了声学制度中的时间反转实验的光学模拟。这种方法表明，多重散射介质可以在飞秒尺度上用于光操纵，并且具有多种潜在应用，包括量子控制，生物成像和光子学。
Pulses of light propagating through multiply scattering media undergo complex spatial and temporal distortions to form the familiar speckle pattern. There is much current interest in both the fundamental properties of speckles and the challenge of spatially and temporally refocusing behind scattering media. Here we report on the spatially and temporally resolved measurement of a speckle field produced by the propagation of an ultrafast optical pulse through a thick strongly scattering medium. By shaping the temporal profile of the pulse using a spectral phase filter, we demonstrate the spatially localized temporal recompression of the output speckle to the Fourier-limit duration, offering an optical analogue to time-reversal experiments in the acoustic regime. This approach shows that a multiply scattering medium can be put to profit for light manipulation at the femtosecond scale, and has a diverse range of potential applications that includes quantum control, biological imaging and photonics.