论文标题
部分可观测时空混沌系统的无模型预测
Coherent enhancement of optical remission in diffusive media
论文作者
论文摘要
从地壳到人脑，汇出的波被用于在各种扩散介质中传感和成像。分离源和检测器会增加恢复光的穿透深度，但迅速降低了信号强度，导致信号噪声比率较差。在这里，我们通过实验和数字表明，在扩散样品上的激光束将激光束塑造可实现增强的数量级增强级，其穿透深度为10个传输平均值自由路径。我们开发了一个理论模型，该模型可以预测最大损耗增强。我们的分析揭示了恢复波的敏感性的显着提高，对局部吸收的局部变化在扩散介质的深处变化。这项工作说明了连贯的波前控制对非侵入性弥漫性波像应用的潜力，例如弥漫性光学断层扫描和功能性近红外光谱。
From the earth's crust to the human brain, remitted waves are used for sensing and imaging in a diverse range of diffusive media. Separating the source and detector increases the penetration depth of remitted light, yet rapidly decreases the signal strength, leading to a poor signal-to-noise ratio. Here, we experimentally and numerically show that wavefront shaping a laser beam incident on a diffusive sample enables an order of magnitude remission enhancement, with a penetration depth of up to 10 transport mean free paths. We develop a theoretical model which predicts the maximal-remission enhancement. Our analysis reveals a significant improvement in the sensitivity of remitted waves, to local changes of absorption deep inside diffusive media. This work illustrates the potential of coherent wavefront control for non-invasive diffuse-wave imaging applications, such as diffuse optical tomography and functional near-infrared spectroscopy.
