近日，法国巴黎高等师范学院-巴黎文理研究大学的YoonSeok Baek及其研究小组取得一项新进展。经过不懈努力，他们提出了一种复杂介质中空间非相干光的相位共轭方法。相关研究成果已于2023年7月20日在国际知名学术期刊《自然—光子学》上发表。
该研究团队提出了一种基于非相干光的相位共轭方法，实现了在多目标位置非相干发射下的非侵入式光控制。通过从散斑图中检索相互不相干的散射场，研究人员成功表征了隐藏源的散射响应。通过时间反演散射荧光和数字相位共轭，他们在实验中成功实现了光的聚焦于单个和多个目标上。此外，他们还展示了如何通过散射介质，利用传输本征信道向扩展目标输送最大能量。这项研究为利用非相干对比机制控制复杂介质中光的传播打下了基础。
据悉，光在复杂介质（例如生物组织）深处的相干控制对许多研究领域至关重要。尽管通过波前整形对散射光进行相干控制在解决这一挑战方面取得了实质性进展，但在没有物理访问介质内部的情况下，对光的扩展或多目标控制仍然存在一定挑战。
附：英文原文
Title: Phase conjugation with spatially incoherent light in complex media
Author: Baek, YoonSeok, de Aguiar, Hilton B., Gigan, Sylvain
Issue&Volume: 2023-07-20
Abstract: Shaping light deep inside complex media such as biological tissue is critical to many research fields. Although the coherent control of scattered light via wavefront shaping has led to substantial advances in addressing this challenge, controlling light over extended or multiple targets without physical access to the inside of a medium remains elusive. Here we present a phase conjugation method for spatially incoherent light, which enables non-invasive light control based on incoherent emission from multiple target positions. Our method characterizes the scattering responses of hidden sources by retrieving mutually incoherent scattered fields from speckle patterns. By time-reversing scattered fluorescence with digital phase conjugation, we experimentally demonstrate focusing of light on individual and multiple targets. We also demonstrate maximum energy delivery to an extended target through a scattering medium by exploiting transmission eigenchannels. This paves the way to control light propagation in complex media using incoherent contrasts mechanisms.
DOI: 10.1038/s41566-023-01254-5
Source: https://www.nature.com/articles/s41566-023-01254-5