Article
Optics
Junyao Ma, Zhe Li, Shengmei Zhao, Le Wang
Summary: In this paper, a multiple images simultaneous encryption scheme is proposed by encrypting the orbital angular momentum (OAM) holography with ghost imaging. Different images can be selectively obtained for ghost imaging by controlling the topological charge of the incident OAM light beam. The proposed encryption scheme is shown to have a higher capacity for multiple images and is more secure and robust.
Article
Chemistry, Multidisciplinary
Yanzeng Zhang, Peicheng Lin, Pengcheng Huo, Mingze Liu, Yongze Ren, Song Zhang, Qianwei Zhou, Yilin Wang, Yan-qing Lu, Ting Xu
Summary: Conventional microscopes cannot achieve both spiral phase contrast imaging and bright-field imaging at the same time, requiring additional optical elements for mode switching. We present a microscopy setup that incorporates a dielectric metasurface capable of achieving both imaging modes synchronously. The metasurface can focus the light and perform a spatial differentiation operation, allowing for simultaneous acquisition of high-frequency edge information and the entirety of the object. This approach is expected to have applications in microscopy, biomedicine, and materials science due to its planar architecture and ultrathin thickness.
Article
Multidisciplinary Sciences
Lijun Bu, Yongzhong Zhu, Yijun Chen, Yufei Yang, Yadan Zang
Summary: Translation: A high-speed maneuvering targets imaging method based on vortex electromagnetic wave (VEMW) carrying orbital angular momentum (OAM) is proposed in this study. The method establishes an ISAR imaging scenario for high-speed targets and deduces the vortex echo while analyzing its characteristics. An accurate estimation of target speed is achieved through a frequency modulation rate estimation method that considers both calculation efficiency and high precision. Additionally, an adaptive azimuth image compensation method based on minimum entropy is proposed to compensate for the component signals in the linear frequency modulation (LFM) signal. The range profile and azimuth profile are combined to reconstruct the three-dimensional information. Simulation results demonstrate that this method effectively eliminates the influence of high-speed motion on range and azimuth profiles, thereby benefiting the development of ISAR imaging technique for high-speed maneuvering targets.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Dong-Ho Lee, Sunwoo Lee, Woo-Jong Yeo, Seok Kyung Jeong, Minwoo Jeon, Hwan-Jin Choi, Hong Seung Kim, Ji Yong Bae, Dong Uk Kim, Hwan Hur, Sangwon Hyun, Kye-Sung Lee, Ki Soo Chang, Wonkyun Lee, Soojong Pak, Geon Hee Kim, I. Jong Kim
Summary: In this study, wavelength-tunable spiral-phase-contrast (SPC) imaging was successfully achieved, and high-quality imaging was obtained in the visible wavelength range. By rotating an off-axis spiral phase mirror, clear imaging results were achieved at different wavelengths. This technique provides an important experimental basis for developing high-performance wavelength-tunable SPC imaging.
Article
Chemistry, Multidisciplinary
Yanyan Huang, R. V. Vinu, Ziyang Chen, Tushar Sarkar, Rakesh Kumar Singh, Jixiong Pu
Summary: A new holographic ghost diffraction scheme is proposed and experimentally demonstrated for the recovery of OAM modes, utilizing speckle fields and fourth-order correlation. The efficacy of the recovered modes is quantitatively analyzed with an OAM mode analysis utilizing orthogonal projection scheme.
APPLIED SCIENCES-BASEL
(2021)
News Item
Optics
Philippe St-Jean
Summary: This paper presents a novel solid-state laser that can generate a large array of phase-locked optical vortices with tunable orbital angular momentum.
News Item
Optics
Spencer W. Jolly
Summary: A diffractive axicon can create intricate connections between topological charges and frequencies of ultrashort laser pulses, resulting in a diverse range of coiled light structures.
Article
Physics, Multidisciplinary
Yangyang Fu, Yuan Tian, Xiao Li, Shili Yang, Youwen Liu, Yadong Xu, Minghui Lu
Summary: In this study, a new method for achieving robust asymmetric generation of acoustic vortex field through dual-layer metasurfaces is introduced. This is achieved by controlling the intrinsic topologic charges and the parity of geometry design. The underlying physics is contributed to the one-way process of orbital angular momentum transition ensured by the broken spatial symmetry and the external topologic charge from the vortex diffraction. The novel phenomenon is experimentally demonstrated, providing new routes to manipulate the asymmetric response of vortex fields and potential applications in passive OAM-based diodes.
PHYSICAL REVIEW LETTERS
(2022)
Editorial Material
Optics
Gianluca Ruffato
Summary: A recent publication suggests a solution to overcome the limitations of optical techniques and high-intensity beams by probing highly-intense vortex pulses with a structured reference beam.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Johannes Bloechl, Johannes Schoetz, Ancyline Maliakkal, Natalija Sreibere, Zilong Wang, Philipp Rosenberger, Peter Hommelhoff, Andre Staudte, Paul B. Corkum, Boris Bergues, Matthias F. Kling
Summary: In this study, we introduce a method for sampling the optical field by utilizing the enhanced near-field of a nanometric needle tip. This method provides reliable characterization of the spatial distribution and temporal evolution of visible light fields, as well as the resolution of the wavefront and orbital angular momentum of light pulses. The method is also polarization sensitive and applicable to vectorial field reconstruction.
Article
Physics, Multidisciplinary
Aleksi Leinonen, Antti Hannonen, Henri Partanen, Janne Heikkinen, Tero Setala, Ari T. Friberg, Tommi K. Hakala
Summary: This article introduces the geometric phase of classical electromagnetic light beams, which is applicable to fields undergoing cyclic, discrete polarizations changes. Berry later recognized a similar phase for adiabatic quantum systems, extending it to nonadiabatic and noncyclic quantum state evolutions. However, no optical counterpart for the noncyclic, adiabatic evolution has been demonstrated. In this study, a modified Young's two-pinhole setup is used to generate arbitrary continuous spatial evolution of polarization state, demonstrating the adiabatic noncyclic evolution of the Pancharatnam-Berry phase in an optical context.
COMMUNICATIONS PHYSICS
(2023)
Article
Multidisciplinary Sciences
Zelin Ma, Poul Kristensen, Siddharth Ramachandran
Summary: Spatial mode-count scalability in optical fibers is severely limited by perturbative mode mixing. We propose an alternative means of light guidance using light's orbital angular momentum to create a centrifugal barrier. This distinctive light-guidance regime enables low-loss transmission of light, substantially increasing the information content per photon for quantum or classical networks.
Article
Multidisciplinary Sciences
Lu Chen, Wenqi Zhu, Pengcheng Huo, Junyeob Song, Henri J. Lezec, Ting Xu, Amit Agrawal
Summary: Researchers have proposed a flexible approach to synthesize ultrafast optical transients with arbitrary control over its complete spatiotemporal evolution by leveraging the multifunctional control of light at the nanoscale. This method supports an ultrawide bandwidth with high spectral and spatial resolution, enabling the synthesis of complex states of structured space-time wave packets.
Article
Multidisciplinary Sciences
Xinglin Zeng, Philip St J. Russell, Christian Wolff, Michael H. Frosz, Gordon K. L. Wong, Birgit Stiller
Summary: This study reports a light-driven nonreciprocal isolation system for optical vortex modes based on topology-selective stimulated Brillouin scattering (SBS) in chiral photonic crystal fiber. The experimental results show a vortex isolation of 22 decibels (dB), which is at the state of the art in fundamental mode isolators using SBS. This device may find applications in optical communications, fiber lasers, quantum information processing, and optical tweezers.
Article
Optics
Furong Zhang, Ling -Jun Kong, Zhuo Zhang, Jingfeng Zhang, Xiangdong Zhang
Summary: Holography has been widely used in various fields such as microscopy, optical security, and data storage. In this study, a new holography technique called RI holography is proposed and demonstrated, which utilizes strong RI selectivity in the spatial-frequency domain. Additionally, LG holography is realized with a 26-bit LG-multiplexing hologram for high-security optical encryption, contributing to the establishment of a high-capacity holographic information system.
Article
Computer Science, Artificial Intelligence
Chao Ma, Minjie Wan, Yunkai Xu, Kan Ren, Weixian Qian, Qian Chen, Guohua Gu
Summary: This paper proposes an infrared target tracker based on the proximal robust principal component analysis method, solves the convex optimization problem using the Alternating Direction Method of Multipliers, and locates the target using the particle filter framework.
APPLIED INTELLIGENCE
(2022)
Article
Computer Science, Artificial Intelligence
Kan Ren, Yuan Gao, Minjie Wan, Guohua Gu, Qian Chen
Summary: Infrared small target detection has always been a challenging problem due to the limited pixels and features of small infrared targets. Current optimization methods primarily focus on multi-scale feature fusion or super-resolution enhancement. However, when applying super-resolution networks to infrared target detection, two significant issues arise: excessive computational power consumption, resulting in low detection rates, and the disparity between low-resolution training images and the actual distribution of tiny targets, leading to poor detection accuracy. This paper proposes a new detection network, RSRGAN, which consists of a computationally efficient backbone network (RCN) for extracting potential regions and a GAN-based generator that includes modules for distribution transformation and super-resolution enhancement. The discriminator assists in generating better super-resolution images by distinguishing between generated and actual images. Additionally, the authors create an infrared UAV small target dataset, which includes birds, leaves, and other disturbances, to evaluate the algorithm's performance. Experimental results demonstrate that the proposed method achieves better detection of small IR targets and outperforms existing approaches.
APPLIED INTELLIGENCE
(2022)
Article
Computer Science, Artificial Intelligence
Wuxin Li, Qian Chen, Guohua Gu, Xiubao Sui
Summary: The study proposes a method for object matching between visible and infrared images using a Siamese neural network combined with a convolutional neural network for feature extraction and cross-correlation calculations for matched targets, achieving higher accuracy and precision in experiments.
APPLIED INTELLIGENCE
(2022)
Article
Geochemistry & Geophysics
Minjie Wan, Guohua Gu, Yunkai Xu, Weixian Qian, Kan Ren, Qian Chen
Summary: This paper proposes a total variation-based interframe infrared patch-image model for infrared small target detection. By converting the infrared image into a patch-image consisting of a sparse target matrix and a low-rank background matrix, and introducing temporal consistency constraint and TV regularization term, the proposed model achieves better performance in infrared small target detection.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Optics
Yixuan Li, Jiaming Qian, Shijie Feng, Qian Chen, Chao Zuo
Summary: Single-shot fringe projection profilometry (FPP) is crucial for retrieving the absolute depth information of objects in high-speed dynamic scenes. This study proposes a composite fringe projection deep learning profilometry (CDLP) method that combines deep learning and physical model to achieve high-precision and unambiguous phase retrieval on a single composite fringe image. The method overcomes the problem of serious spectrum aliasing caused by multiplexing schemes and can reconstruct high-quality absolute 3D surfaces.
Article
Optics
Ning Zhou, Jiaji Li, Runnan Zhang, Zhidong Bai, Shun Zhou, Qian Chen, Chao Zuo
Summary: This study presents a 3D label-free refractive index imaging technique based on single-exposure intensity diffraction tomography (sIDT) using a color-multiplexed illumination scheme. By capturing the scattering field from different directions and separating monochromatic intensity images, the 3D refractive index distribution of the object can be reconstructed. The method demonstrates reliable performance in label-free, high-throughput, and real-time 3D volumetric biological imaging applications.
Article
Chemistry, Multidisciplinary
Xuan Wang, Haiyang Lyu, Tianyi Mao, Weiji He, Qian Chen
Summary: This paper proposes a method for point cloud segmentation using tensor feature, which can solve the difficulty of segmenting point cloud data obtained from unprofessional LiDAR devices.
APPLIED SCIENCES-BASEL
(2022)
Correction
Optics
Chao Zuo, Jiaming Qian, Shijie Feng, Wei Yin, Yixuan Li, Pengfei Fan, Jing Han, Kemao Qian, Qian Chen
LIGHT-SCIENCE & APPLICATIONS
(2022)
Review
Optics
Chao Zuo, Jiaming Qian, Shijie Feng, Wei Yin, Yixuan Li, Pengfei Fan, Jing Han, Kemao Qian, Qian Chen
Summary: Optical metrology, with the advances in deep learning technologies, has become a versatile problem-solving tool in various fields such as manufacturing, fundamental research, and engineering applications. This review provides an overview of the current status and latest progress of deep learning in optical metrology, covering applications in tasks like fringe denoising, phase retrieval, and error compensation. The challenges and future research directions are also discussed.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Xueqi Chen, Lin Zhou, Meng Zhou, Ajun Shao, Kan Ren, Qian Chen, Guohua Gu, Minjie Wan
Summary: This paper proposes an infrared ocean image simulation algorithm based on the Pierson-Moskowitz spectrum and a bidirectional reflectance distribution function, which can provide more authentic and clear simulation images.
Article
Optics
Miao Wu, Yu Lu, Haochen Li, Tianyi Mao, Yanqiu Guan, Labao Zhang, Weiji He, Peiheng Wu, Qian Chen
Summary: Long-range lidar systems often record large but extremely sparse data cubes, making it challenging to accurately estimate depth images. This paper introduces an intensity-guided method that utilizes temporal-spatial correlation to estimate depth images. Preprocessing steps are used to reduce the data size. Experimental results show that this method outperforms other state-of-the-art methods in estimating depth images, particularly in low signal return scenarios.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Steven Johnson, Alex McMillan, Stefan Frick, John Rarity, Miles Padgett
Summary: A limitation of free-space optical communications is the ease of interception, which can be overcome by hiding information within background optical noise. We demonstrate image transfer over free-space using a photon-pair source emitting two correlated beams. One beam contains image information with added noise, while the other correlated beam serves as a heralding trigger to differentiate the image signal from background noise. The system utilizes spontaneous parametric down-conversion and a gated intensified camera to extract the image from the noise.
Article
Optics
Konstantin Y. Bliokh, Ebrahim Karimi, Miles J. Padgett, Miguel A. Alonso, Mark R. Dennis, Angela Dudley, Andrew Forbes, Sina Zahedpour, Scott W. Hancock, Howard M. Milchberg, Stefan Rotter, Franco Nori, Sahin K. Ozdemir, Nicholas Bender, Hui Cao, Paul B. Corkum, Carlos Hernandez-Garcia, Haoran Ren, Yuri Kivshar, Mario G. Silveirinha, Nader Engheta, Arno Rauschenbeutel, Philipp Schneeweiss, Juergen Volz, Daniel Leykam, Daria A. Smirnova, Kexiu Rong, Bo Wang, Erez Hasman, Michela F. Picardi, Anatoly Zayats, Francisco J. Rodriguez-Fortuno, Chenwen Yang, Jie Ren, Alexander B. Khanikaev, Andrea Alu, Etienne Brasselet, Michael Shats, Jo Verbeeck, Peter Schattschneider, Dusan Sarenac, David G. Cory, Dmitry A. Pushin, Michael Birk, Alexey Gorlach, Ido Kaminer, Filippo Cardano, Lorenzo Marrucci, Mario Krenn, Florian Marquardt
Summary: Structured waves are found in all areas of wave physics, both classical and quantum, where the wavefields are inhomogeneous and cannot be approximated by a single plane wave. These complex wavefields with inhomogeneities are crucial in various fields such as nanooptics, photonics, quantum matter waves, acoustics, water waves, etc. This Roadmap surveys the role of structured waves in wave physics, providing background, current research, and anticipating future developments.
Article
Optics
Sara Restuccia, Graham M. Gibson, Leroy Cronin, Miles J. Padgett
Summary: This study demonstrates the measurement of optical activity in a sample using an unpolarized light source, with the help of a polarization-entangled photon source. This approach allows for low light measurement and the analysis of samples that may be perturbed by polarized light.
Article
Optics
Steven Johnson, Alex McMillan, Yril Torre, Stefan Frick, John Rarity, Miles Padgett
Summary: Traditional remote sensing applications based on pulsed laser illumination are not suitable for covert operation. We present a method that uses correlated photon-pairs to perform single-pixel imaging, suppressing background light effect and improving signal-to-noise ratio.
