Article
Optics
Tianrui Zhao, Sebastien Ourselin, Tom Vercauteren, Wenfeng Xia
Summary: Wavefront shaping technology holds great promise for enabling light focusing deep into biological tissue, but in vivo demonstrations remain challenging. This study presents a high-speed photoacoustic-guided wavefront shaping method based on the characteristics of a scattering medium, achieving significant results through optimization of binary amplitude modulation modes of a digital micromirror device.
Article
Optics
Tianrui Zhao, Sebastien Ourselin, Tom Vercauteren, Wenfeng Xia
Summary: This study compared four representative DMD-based wavefront shaping methods under the same conditions and found that the RVITM-based algorithm had a higher focusing speed and comparable PBR. The genetic algorithm offered the highest PBR but suffered from the lowest focusing speed.
Article
Physics, Applied
Linxian Liu, Kui Ma, Yuan Qu, Qiaozhi He, Rongjun Shao, Cheng Chen, Jiamiao Yang
Summary: By combining genetic algorithm with encoding neighboring pixels of DMD, this study successfully increased the anti-scattering capability, contributing to important advancements in deep tissue noninvasive optical imaging, optogenetics, and photodynamic therapy.
APPLIED PHYSICS EXPRESS
(2021)
Article
Optics
Yanyu Zhao, Qiaozhi He, Shuna Li, Jiamiao Yang
Summary: This study presents a gradient-assisted wavefront shaping strategy that is faster and achieves higher focus enhancement compared to genetic algorithms. By optimizing parameters in the function distribution space and utilizing gradient information, the proposed method outperforms genetic algorithms in terms of speed and focus enhancement, as quantified by the peak-to-background ratio (PBR).
Article
Optics
Tao Li, Jing Hu, Xiaoling Ji
Summary: This study focuses on the imaging and focusing characteristics of partially coherent light pulses (PCLPs) propagating through a thin lens in nonlinear self-focusing media. Analytical formulas for image distance, image size, and focal length are derived. The results indicate that the time delay of the image distance is dependent on the spatial coherence of the light, while the time delay of the image size is not. Additionally, it is found that PCLPs have advantages in avoiding optical damage as the incident distance or thin lens focal length increases or the initial pulse width decreases when the pulse peak power is fixed.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
He Zhang, Santosh Kumar, Yong Meng Sua, Shenyu Zhu, Yu-Ping Huang
Summary: We demonstrate a photon-sensitive, three-dimensional camera using active near-infrared illumination and fast time-of-flight gating. This camera achieves sub-millimeter depth resolution, exceptional noise suppression, and high detection sensitivity by selectively upconverting backscattered photons and photon sensitive detection. This technique may find applications in biomedical imaging, environmental monitoring, and wide-field light detection and ranging.
PHOTONICS RESEARCH
(2022)
Article
Optics
Shanshan Zheng, Meihua Liao, Fei Wang, Wenqi He, Xiang Peng, Guohai Situ
Summary: The white-light NLOS imaging method proposed in this study utilizes a deep neural network to learn the optimization of the scattered pattern autocorrelation and object image reconstruction through a two-step DNN strategy. Optical experiments have demonstrated the effectiveness of this method.
Article
Optics
Zhirun Wang, Wenjing Zhao, Aiping Zhai, Peng He, Dong Wang
Summary: An optimized sampling method using a Deep Q-learning Network (DQN) is proposed for single-pixel imaging, treating the sampling process as decision-making to obtain a relatively optimal sampling strategy for OT-SPI. The effectiveness of the method is verified through simulations and experiments, eliminating the influence of imperfect sampling path planning on imaging performance.
Article
Physics, Applied
Linxian Liu, Chunxu Ding, Yuan Qu, Qiaozhi He, Rongjun Shao, Jiamiao Yang
Summary: The full-polarization iterative wavefront shaping (FPI-WS) method, using two digital micromirror devices, adds one more degree of freedom in shaping the wavefront by independently modulating two orthogonal polarization components, and can increase the peak to background ratio of focus by a factor of two.
APPLIED PHYSICS EXPRESS
(2022)
Correction
Optics
Pritam Pai, Jeroen Bosch, Matthias Kuhmayer, Stefan Rotter, Allard P. Mosk
Summary: A correction to the paper has been published.
Article
Chemistry, Analytical
Niklas Fritzsche, Felix Ott, Karsten Pink, Alwin Kienle
Summary: Manipulating the wavefront of coherent light incident on scattering media to enhance imaging depth, sensitivity, and resolution is a common technique in biomedical applications. This study focuses on controlling scattering and absorption coefficients to study the behavior of wavefront shaping and achievable intensity enhancement behind scattering media with well-defined optical properties.
Article
Optics
Huichuan Lin, Cheng Huang, Zhimin He, Jun Zeng, Fuchang Chen, Chaoqun Yu, Yan Li, Yongtao Zhang, Huanting Chen, Jixiong Pu
Summary: This paper presents an approach for phase imaging through scattering media using an incoherent light source, by training a Convolutional Neural Network (CNN) to reconstruct target images from captured speckle images. Over 90% similarities between reconstructed and target images were achieved. It concludes that an incoherent light source can be used for scattering phase imaging with the assistance of deep learning technology.
Article
Engineering, Electrical & Electronic
Hongyuan Wang, Jiaqi Li, Haofeng Hu, Junfeng Jiang, Xiaobo Li, Kan Zhao, Zhenzhou Cheng, Mei Sang, Tiegen Liu
Summary: Polarimetric imaging is an effective way for enhancing image quality in underwater environments. The proposed method based on the Mueller imager synergistically modulates the polarization states of illumination light and a polarization filter in an optical way to filter out backscattered light and improve image quality without digital processing. Experimental results confirm the effectiveness and superiority of this method in scattering media.
IEEE PHOTONICS JOURNAL
(2021)
Article
Physics, Applied
Zong-Han Hsieh, Ching-Hsiang Fan, Meng-Lin Li, Chih-Kuang Yeh
Summary: This study proposes a method to improve the local light intensity in scattering media by generating transient microbubbles using ultrasound and super hydrophobic polytetrafluoroethylene nanoparticles (PTFE NPs). Results show that only microbubbles of the proper size can effectively increase light propagation.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Jiamiao Yang, Qiaozhi He, Linxian Liu, Yuan Qu, Rongjun Shao, Bowen Song, Yanyu Zhao
Summary: The antiscattering light focusing by wavefront shaping relies on speed and enhancement, and the digital-micromirror device (DMD) is a potential solution due to its high pattern rate and modulation modes. However, binary modulation by DMD restricts speed and enhancement. A multi-pixel encoded DMD-based method was proposed to overcome this limitation and increase optimization speed and focus enhancement significantly.
LIGHT-SCIENCE & APPLICATIONS
(2021)
