标题： 扩散介质中光学发射的相干增强 显示英文标题

标题： Coherent enhancement of optical remission in diffusive media

摘要： 从地壳到人脑，散射波被用于多种扩散介质中的传感和成像。 分离光源和探测器会增加散射光的穿透深度，但会迅速降低信号强度，导致信噪比差。 在这里，我们通过实验和数值模拟表明，对入射到扩散样品上的激光束进行波前整形可以实现数量级的散射增强，穿透深度可达10个输运平均自由程。 我们建立了一个理论模型，可以预测最大散射增强。 我们的分析揭示了散射波对扩散介质内部局部吸收变化的灵敏度有显著提高。 这项工作展示了相干波前控制在非侵入式扩散波成像应用中的潜力，例如扩散光学断层扫描和功能性近红外光谱。 显示英文摘要

摘要： 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.