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| 1 | Harnessing a multi-dimensional fibre laser using genetic wavefront shaping显示文摘The multi-dimensional laser is a fascinating platform not only for the discovery and understanding of new higherdimensional coherent lightwaves but also for the frontier study of the complex three-dimensional(3D)nonlinear dynamics and solitary waves widely involved in physics,chemistry,biology and materials science.Systemically controlling coherent lightwave oscillation in multi-dimensional lasers,however,is challenging and has largely been unexplored;yet,it is crucial for both designing 3D coherent light fields and unveiling any underlying nonlinear complexities.Here,for the first time,we genetically harness a multi-dimensional fibre laser using intracavity wavefront shaping technology such that versatile lasing characteristics can be manipulated.We demonstrate that the output power,mode profile,optical spectrum and mode-locking operation can be genetically optimized by appropriately designing the objective function of the genetic algorithm.It is anticipated that this genetic and systematic intracavity control technology for multi-dimensional lasers will be an important step for obtaining high-performance 3D lasing and presents many possibilities for exploring multi-dimensional nonlinear dynamics and solitary waves that may enable new applications. | Xiaoming Wei Joseph C.Jing Yuecheng Shen Lihong V.Wang | 2020 | Light(Science & Applications)2020，9，1： | 3 |
| 2 | Generalizing the Gerchberg–Saxton algorithm for retrieving complex optical transmission matrices显示文摘The Gerchberg–Saxton(GS)algorithm,which retrieves phase information from the measured intensities on two related planes(the source plane and the target plane),has been widely adopted in a variety of applications when holographic methods are challenging to be implemented.In this work,we showed that the GS algorithm can be generalized to retrieve the unknown propagating function that connects these two planes.As a proof-of-concept,we employed the generalized GS(GGS)algorithm to retrieve the optical transmission matrix(TM)of a complex medium through the measured intensity distributions on the target plane.Numerical studies indicate that the GGS algorithm can efficiently retrieve the optical TM while maintaining accuracy.With the same training data set,the computational time cost by the GGS algorithm is orders of magnitude less than that consumed by other non-holographic methods reported in the literature.Besides numerical investigations,we also experimentally demonstrated retrieving the optical TMs of a stack of ground glasses and a 1-m-long multimode fiber using the GGS algorithm.The accuracy of the retrieved TM was evaluated by synthesizing high-quality single foci and multiple foci on the target plane through these complex media.These results indicate that the GGS algorithm can handle a large TM with high efficiency,showing great promise in a variety of applications in optics. | GUOQIANG HUANG DAIXUAN WU JIAWEI LUO LIANG LU FAN LI YUECHENG SHEN ZHAOHUI LI | 2021 | Photonics Research2021，9，1： | 2 |
| 3 | Wavefront shaping: A versatile tool to conquer multiple scattering in multidisciplinary fields显示文摘Optical techniques offer a wide variety of applications as light-matter interactions provide extremely sensitive mechanisms to probe or treat target media.Most of these implementations rely on the usage of ballistic or quasi-ballistic photons to achieve high spatial resolution.However,the inherent scattering nature of light in biological tissues or tissue-like scattering media constitutes a critical obstacle that has restricted the penetration depth of non-scattered photons and hence limited the implementation of most optical techniques for wider applications.In addition,the components of an optical system are usually designed and manufactured for a fixed function or performance.Recent advances in wavefront shaping have demonstrated that scattering-or component-induced phase distortions can be compensated by optimizing the wavefront of the input light pattern through iteration or by conjugating the transmission matrix of the scattering medium. | Zhipeng Yu Huanhao Li Tianting Zhong Jung-Hoon Park Shengfu Cheng Chi Man Woo Qi Zhao Jing Yao Yingying Zhou Xiazi Huang Weiran Pang Hansol Yoon Yuecheng Shen Honglin Liu Yuanjin Zheng YongKeun Park Lihong V.Wang Puxiang Lai | 2022 | The Innovation2022，3，5： | 1 |
| 4 | Two-stage matrix-assisted glare suppression at a large scale显示文摘Scattering-induced glares hinder the detection of weak objects in various scenarios.Recent advances in wavefront shaping show one can not only enhance intensities through constructive interference but also suppress glares within a targeted region via destructive interference.However,due to the lack of a physical model and mathematical guidance,existing approaches have generally adopted a feedback-based scheme,which requires timeconsuming hardware iteration.Moreover,glare suppression with up to tens of speckles was demonstrated by controlling thousands of independent elements.Here,we reported the development of a method named twostage matrix-assisted glare suppression(TAGS),which is capable of suppressing glares at a large scale without triggering time-consuming hardware iteration.By using the TAGS,we experimentally darkened an area containing 100 speckles by controlling only 100 independent elements,achieving an average intensity of only 0.11 of the original value.It is also noticeable that the TAGS is computationally efficient,which only takes 0.35 s to retrieve the matrix and 0.11 s to synthesize the wavefront.With the same number of independent controls,further demonstrations on suppressing larger scales up to 256 speckles were also reported.We envision that the superior performance of the TAGS at a large scale can be beneficial to a variety of demanding imaging tasks under a scattering environment. | DAIXUAN WU JIAWEI LUO ZHIBING LU HANPENG LIANG YUECHENG SHEN ZHAOHUI LI | 2022 | Photonics Research2022，10，12： | 0 |
| 5 | A thorough study on genetic algorithms in feedback-based wavefront shaping显示文摘Feedback-based wavefront shaping focuses light through scattering media by employing phase optimization algorithms.Genetic algorithms(GAs),inspired by the process of natural selection,are well suited for phase optimization in wavelfront shaping problems.In 2012,Conkey et al.first introduced a GA into feedback-based wavefront shaping to find the optimum phase map.Since then,due to its siuperior performance in noisy environment,the GA has been widely adopted by lots of implementations.However,there have been limited studies discussing and optimizing the detailed procedures of the GA.To fill this blank,in this study,we performed a thorough study on the performance of the GA for focusing light through scattering media.Using numerical tools,we evaluated certain procedures that can be potentially improved and provided guidance on how to choose certain parameters appropriately.This study is beneficial in improving the performance of wavefront shaping systems with GAs. | Daixuan Wu Jiawei Luo Zhaohui Li Yuecheng Shen | 2019 | Journal of Innovative Optical Health Sciences2019，，4： | 0 |
| 6 | Topological edge states at singular points in non-Hermitian plasmonic systems显示文摘We introduce non-Hermitian plasmonic waveguide-cavity systems with topological edge states(TESs)at singular points.The compound unit cells of the structures consist of metal-dielectric-metal(MDM)stub resonators side-coupled to an MDM waveguide.We show that we can realize both a TES and an exceptional point at the same frequency when a proper amount of loss is introduced into a finite three-unit-cell structure.We also show that the finite structure can exhibit both a TES and a spectral singularity when a proper amount of gain is introduced into the structure.In addition,we show that we can simultaneously realize a unidirectional spectral singularity and a TES when proper amounts of loss and gain are introduced into the structure.We finally show that this singularity leads to extremely high sensitivity of the reflected light intensity to variations of the refractive index of the active materials in the structure.TESs at singular points could potentially contribute to the development of singularity-based plasmonic devices with enhanced performance. | Yin Huang Yuecheng Shen Georgios Veronis | 2022 | Photonics Research2022，10，3： | 0 |
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