散射鲁棒的方位角特征增强分辨率成像
Scattering-robust Imaging of Azimuthal Features with Enhanced Resolution
- Indian Institute of Technology Kanpur（坎普尔印度理工学院）
- Paderborn University（帕德博恩大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究采用方位角部分相干场替代单模完全相干照明，在散射介质中实现方位角特征增强分辨率成像，将成像对比度从约7%提升至50%。
AI中文摘要：
通过散射介质成像在众多实际应用中仍然是一个长期存在的挑战，涵盖从医学成像到远距离传感等领域。近期研究表明，由单一轨道角动量（OAM）模式构成的照明（其在方位角坐标上具有结构）能够为具有方位角特征的物体提供增强的分辨率，且分辨率在最优OAM值处达到最大。然而，在存在散射的情况下，空间完全相干的单模场会因散斑形成而导致成像分辨率显著下降。在本工作中，我们采用方位角部分相干场，并实验演示了在散射存在下对方位角特征进行增强分辨率的成像。我们表明，此类照明中较低的方位角相干度可增强对散射的鲁棒性，而照明的方位角结构则确保了分辨率的增强。我们推导了最佳成像分辨率的条件，并报告当照明从单模完全相干场切换为方位角部分相干场时，散射中的成像对比度从约7%提升至50%。
英文摘要：
Imaging through scattering media remains a long-standing challenge in numerous real-world applications, ranging from medical imaging to long-distance sensing. Recently, illumination consisting of a single orbital angular momentum (OAM) mode, which is structured in the azimuthal coordinate, has been shown to provide enhanced resolution for imaging objects with azimuthal features, with the resolution becoming maximum at an optimal OAM value. However, in the presence of scattering, single-mode fields, which are spatially fully coherent, cause the imaging resolution to decrease significantly due to speckle formation. In this work, we employ azimuthally partially coherent fields and experimentally demonstrate imaging of azimuthal features with enhanced resolution in the presence of scattering. We show that lower degree of azimuthal coherence in such illumination leads to increased robustness against scattering while the azimuthal structure of the illumination ensures enhanced resolution. We derive the condition for best imaging resolution, and we report increase of imaging contrast in scattering from about 7% to 50% as the illumination is changed from a single-mode fully coherent field to that of an azimuthal partially coherent field.
