Space-time (ST) wave packets are diffraction-free, dispersion-free pulsed beams whose propagation invariance stems from correlations introduced into their spatio-temporal spectra. We demonstrate here experimentally and computationally that ST light sheets exhibit self-healing properties upon traversing obstacles in the form of opaque obstructions. The unscattered fraction of the wave packet retains the spatio-temporal correlations and, thus, propagation invariance is maintained. The scattered component does not satisfy the requisite correlation and thus, undergoes diffractive spreading. These results indicate the robustness of ST wave packets and their potential utility for deep illumination and imaging in scattering media, such as biological tissues.

中文翻译：

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时空光片的自我修复

时空（ST）波包是无衍射，无色散的脉冲束，其传播不变性源于引入其时空频谱的相关性。我们在这里通过实验和计算证明，ST光片在以不透明障碍物的形式越过障碍物时表现出自愈特性。波包的未散射部分保留了时空相关性，因此保持了传播不变性。散射的分量不满足必要的相关性，因此经历了衍射扩展。这些结果表明ST波包的鲁棒性及其在散射介质（例如生物组织）中进行深度照明和成像的潜在用途。