AI 中文总结
该研究揭示了由波前曲率产生的几何相空间非可分性，其引发的巨大光束位移具有抗空间相干性退化的特性，确立了波前曲率作为调控多类系统光束位移的通用机制。
AI 中文摘要
多自由度间的非可分性已在结构光及其相关应用中取得基础性进展。本文揭示了相空间中一种此前被忽视的非可分性形式，将其命名为几何相空间非可分性。该现象仅由常规波包（如基模高斯光束）的波前曲率产生，表现为光束横截面上与位置相关的横向动量分布，导致光束在平面界面反射时出现巨大的空间和角位移。我们通过解析预测并实验观测了该位移。值得注意的是，曲率诱导的相空间相关性对空间相干性退化具有鲁棒性，即使在近非相干状态下，巨大位移仍能保持。本研究确立了波前曲率作为一种通用机制，可用于在光学、声学和物质波系统中调控光束位移。
英文摘要
Nonseparability among multiple degrees of freedom has enabled fundamental advances in structured light and related applications. Here we unveil a previously overlooked form of nonseparability in phase space, which we term geometric phase-space nonseparability. The latter arises solely from the wavefront curvature of a conventional wave packet, such as a fundamental Gaussian beam. This phase-space structure manifests as a position-dependent transverse-momentum distribution across the beam profile leading to the giant spatial and angular beam shifts upon reflection at a planar interface that we predict analytically and observe experimentally. Remarkably, the curvature-induced phase-space correlation remains robust against spatial-coherence degradation, allowing the giant shifts to persist even in the nearly incoherent regime. Our results establish wavefront curvature as a general mechanism for engineering beam shifts across optical, acoustic, and matter-wave systems.
Comments6 pages, 5 figures
