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学者姓名：万玉红
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Abstract ：
In the rapidly evolving fields of Augmented Reality (AR) and Virtual Reality (VR), achieving high diffraction efficiency and a wide field of view (FOV) is critical for enhancing visual experience. This paper presents a three-layer Polarisation Volume Grating (TL-PVG) structure designed to address the limitations of single-layer PVGs in AR/VR applications. By stacking multiple PVG layers with different tilt angles, TL-PVG achieves an expanded angular bandwidth and improved diffraction efficiency, enabling brighter and more immersive displays. The proposed TL-PVG structure incorporates polarisation multiplexing to optimise the optical diffraction efficiency by approximately 75%, thereby enhancing image brightness and sharpness. The experimental results demonstrate that TL-PVG significantly outperforms traditional single-layer PVGs, offering a promising solution for waveguide elements in next-generation AR/VR displays. This study provides a comprehensive analysis of the fabrication process, optical properties, and applications of TL-PVGs, highlighting their potential to revolutionise the AR/VR technology.
Keyword ：
Polarization volume gratings Polarization volume gratings augmented and virtual reality augmented and virtual reality liquid crystal liquid crystal field of view field of view diffraction efficiency diffraction efficiency
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| GB/T 7714 | Zia, Ali , Wu, Huiran , Saeed, Sadaf et al. Three-layer polarisation volume grating with enhanced diffraction efficiency and FOV in AR and VR applications [J]. | LIQUID CRYSTALS , 2024 . |
| MLA | Zia, Ali et al. "Three-layer polarisation volume grating with enhanced diffraction efficiency and FOV in AR and VR applications" . | LIQUID CRYSTALS (2024) . |
| APA | Zia, Ali , Wu, Huiran , Saeed, Sadaf , Man, Tianlong , Liu, Hongmei , XiaoChen, Chen et al. Three-layer polarisation volume grating with enhanced diffraction efficiency and FOV in AR and VR applications . | LIQUID CRYSTALS , 2024 . |
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Abstract ：
With the rapid advancement of high-speed communication and computational technologies, AR and VR are regarded as next-generation platforms for immersive human-digital interaction. Polarization Volume Gratings (PVGs) is a game-changing breakthrough in the fast-growing field of augmented reality and virtual reality (AR/VR), considerably advancing holographic waveguide applications. However, replicating the sophisticated performance of human vision while keeping tiny and lightweight near-eye display modules is a huge problem for optical engineers. Recent advances in holographic optical elements (HOEs) and lithography-enabled devices are highlighted as novel approaches to overcoming classic optical restrictions in AR and VR systems. High-resolution-density and high-brightness Liquid Crystal (LC) technology is a promising picture source for see-through AR displays, particularly in bright environments. This comprehensive study investigates the emerging significance of planar and ultrathin diffractive LC polarization optical elements in AR and VR. Ultrathin planar diffractive LC optical elements, like reflective phase LC gratings, geometric phase LC grating and lens, have proven useful in AR and VR for a variety of purposes, including Exit Pupil Expansion (EPE), enlightening field of view (FOV), reducing chromatic aberrations, and achieving gaze-matched Maxwellian displays through dynamic pupil steering. This analysis concludes with a discussion of future research directions, paving the way for the next generation of advances in photonic devices for AR and VR displays.
Keyword ：
virtual reality virtual reality Polarization volume gratings Polarization volume gratings holographic waveguides holographic waveguides liquid crystals liquid crystals augmented reality head-mounted display augmented reality head-mounted display
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| GB/T 7714 | Zia, Ali , Saeed, Sadaf , Man, Tianlong et al. Next-generation interfaces: integrating liquid crystal technologies in augmented and virtual reality - A review [J]. | LIQUID CRYSTALS REVIEWS , 2024 , 12 (1) : 30-56 . |
| MLA | Zia, Ali et al. "Next-generation interfaces: integrating liquid crystal technologies in augmented and virtual reality - A review" . | LIQUID CRYSTALS REVIEWS 12 . 1 (2024) : 30-56 . |
| APA | Zia, Ali , Saeed, Sadaf , Man, Tianlong , Liu, Hongmei , Chen, Chen Xiao , Wan, Yuhong . Next-generation interfaces: integrating liquid crystal technologies in augmented and virtual reality - A review . | LIQUID CRYSTALS REVIEWS , 2024 , 12 (1) , 30-56 . |
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Abstract ：
Optical encryption based on interferenceless coding aperture correlation holography (I-COACH) is one of the holographic encryption technologies. I-COACH with dual-channel has been employed to encrypt two plaintexts, not only is the encryption capacity limited, but when the two plaintexts are horizontally overlapped, the crosstalk between the two decrypted plaintexts becomes significant. To address these issues, we present an optical multiple images encryption system based on single-channel I-COACH. In our optical encryption system, the multiple images are placed adjacent to each other and encrypted simultaneously through a single-shot I-COACH. The traditional cross-correlation methods fail to decrypt the multiple plaintexts, we propose a decryption scheme based on a novel deep learning framework (M-Net). The multiple plaintexts can be decrypted from a single ciphertext simultaneously, greatly improving the decryption efficiency by our method. Moreover, the crosstalk between the multiple images is avoided. Various experiments are conducted to demonstrate the effectiveness and feasibility of our proposal.
Keyword ：
Optical information processing Optical information processing Computational imaging Computational imaging Deep learning Deep learning Incoherent holography Incoherent holography Encryption Encryption
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| GB/T 7714 | Zhang, Minghua , Wan, Yuhong , Man, Tianlong et al. Multiple images simultaneous encryption and decryption via deep-learning assisted interferenceless coded aperture correlation holography [J]. | OPTICS COMMUNICATIONS , 2024 , 573 . |
| MLA | Zhang, Minghua et al. "Multiple images simultaneous encryption and decryption via deep-learning assisted interferenceless coded aperture correlation holography" . | OPTICS COMMUNICATIONS 573 (2024) . |
| APA | Zhang, Minghua , Wan, Yuhong , Man, Tianlong , Zhou, Hongqiang , Zhang, Wenxue , Liu, Zenghua . Multiple images simultaneous encryption and decryption via deep-learning assisted interferenceless coded aperture correlation holography . | OPTICS COMMUNICATIONS , 2024 , 573 . |
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Abstract ：
在大学物理中，光的干涉和衍射现象是描述光的粒子性和波动性非常常见的内容。那么光的干涉需满足相干条件，即两束光具有相同的偏振态、相同的频率和固定的相位差。因此，在标量衍射理论中，完全正交偏振的光不能够发生干涉现象。为拓展和探究正交偏振态下两束光相遇时光场的矢量变化，本文构建了基于马赫-曾德尔配置的正交偏振光(即正交线偏振和正交圆偏振)相干涉而产生的光场，利用检偏器检测光场的矢量特征及条纹分布情况。结果表明正交偏振光相干涉产生了周期性的矢量光场。该研究能够帮助学生更加直观的掌握波片及偏振片调制不同偏振态的光束并实现矢量光场的检测和分析。
Keyword ：
琼斯矩阵 琼斯矩阵 干涉 干涉 正交偏振 正交偏振 矢量 矢量 检测 检测
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| GB/T 7714 | 周宏强 , 赵崇利 , 满天龙 et al. 正交偏振干涉的矢量光场分析和检测 [J]. | 物理与工程 , 2024 , 34 (01) : 114-119 . |
| MLA | 周宏强 et al. "正交偏振干涉的矢量光场分析和检测" . | 物理与工程 34 . 01 (2024) : 114-119 . |
| APA | 周宏强 , 赵崇利 , 满天龙 , 万玉红 . 正交偏振干涉的矢量光场分析和检测 . | 物理与工程 , 2024 , 34 (01) , 114-119 . |
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Abstract ：
涂层结构具有美观、隔热和耐腐蚀等优点,被广泛应用于航空航天、汽车船舶制造和制药等领域.但在涂层制备和服役过程中会不可避免地出现气泡和裂纹等缺陷,且涂层厚度和均匀性会直接影响涂层寿命,因此对涂层结构的检测显得十分重要.与常规无损检测技术相比,太赫兹时域光谱(THz-TDS)技术非接触性好、抗干扰性强,适用于涂层结构快速无损检测.首先,简要地介绍了太赫兹波、太赫兹时域光谱技术和典型的太赫兹时域光谱系统;然后,详细地阐述了太赫兹时域光谱技术在光学参量、厚度和微结构检测方面的国内外研究进展,特别是太赫兹波在汽车船舶、航空航天和生物制药方向的厚度检测与成像;最后,分析了涂层结构无损检测的现状,对现有的太赫兹波检测涂层存在的问题进行了总结,并对其未来的发展进行了讨论和展望.
Keyword ：
微结构 微结构 太赫兹时域光谱技术 太赫兹时域光谱技术 厚度 厚度 涂层 涂层 无损检测 无损检测
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| GB/T 7714 | 万玉红 , 董形影 , 吴育衡 et al. 太赫兹时域光谱技术在涂层检测中的研究进展 [J]. | 测控技术 , 2023 , 42 (6) : 22-35 . |
| MLA | 万玉红 et al. "太赫兹时域光谱技术在涂层检测中的研究进展" . | 测控技术 42 . 6 (2023) : 22-35 . |
| APA | 万玉红 , 董形影 , 吴育衡 , 刘增华 . 太赫兹时域光谱技术在涂层检测中的研究进展 . | 测控技术 , 2023 , 42 (6) , 22-35 . |
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Abstract ：
Extending depth-of-field (DOF) of the imaging system without modifying the structure and sacrificing imaging performances of the optical system is of great significance to broaden the capability and application of the imaging system. In this paper, the interferenceless coded aperture correlation holography(I-COACH) is developed to be a large-depth incoherent imaging system by employing an annular multi-focal coded phase mask (AM-CPM). Based on the analyses of axial defocus characteristics in I-COACH, the defocus compensation function is defined, the AM-CPM is designed and multiplexed on the system optical pupil, which plays the role of a gradual lens. In AM-CPM, multi-annular zones with different focal lengths are used to compensate different axial defocus aberrations and adjacent annular zones have symmetric axial defocus aberration correction capability according to the imaging characteristics of the system. The simulations and experimental results fully demonstrate that the axial point spread function distribution of the system obtained by AM-CPM is continuous and the development method enables the extension of the DOF of the I-COACH system by only single exposure point spread hologram. This solution is expected to provide great potential in the field of microscopic imaging and other fields of that based on I-COACH system.
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| GB/T 7714 | Liu, Chao , Wan, Yuhong , Ma, Teng et al. Annular multi-focal-phase mask multiplexing based large depth of field imaging by interferenceless coded aperture correlation holography [J]. | SCIENTIFIC REPORTS , 2023 , 13 (1) . |
| MLA | Liu, Chao et al. "Annular multi-focal-phase mask multiplexing based large depth of field imaging by interferenceless coded aperture correlation holography" . | SCIENTIFIC REPORTS 13 . 1 (2023) . |
| APA | Liu, Chao , Wan, Yuhong , Ma, Teng , Ma, Tian , Man, Tianlong . Annular multi-focal-phase mask multiplexing based large depth of field imaging by interferenceless coded aperture correlation holography . | SCIENTIFIC REPORTS , 2023 , 13 (1) . |
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Abstract ：
In interferenceless coded aperture correlation holography with incoherent illumination(I-COACH), point spread hologram(PSH) is important and it is usually necessary to record the PSH library priori. However, the recording of PSH library is time-consuming and basiclly difficult to obtain ideal PSH. The reconstructions correspondingly suffer from some noise which results from the cross-correlation reconstruction of nonideal PSH and object ho-logram (OH). Here a deep-learning-based interferenceless coded aperture correlation holographic imaging technique (DP-based I-COACH) is developed, in which the object can be reconstructed directly from a single-shot object hologram (OH) without any point spread hologram priori. In DP-based I-COACH, a convolutional neural network (CNN) composed of five encoders and four decoders which follows the encoder-decoder "U-net" ar-chitecture is employed. Different object intensity patterns recorded by single-shot together with their associated ground truth form data pairs, are used to train the CNN. In order to demonstrate the reliability of our proposed method, the imaging performances of our proposal is investigated under different experimental conditions, the reconstruction image quality is obviously improved compared with other reconstruction algorithms. The depth of field extension of our proposal without sacrificing the imaging quality and increasing the complexity of system is also described, which will drive the application of I-COACH in some potential scenarios, such as endoscopic application.
Keyword ：
Incoherent Digital Holography Incoherent Digital Holography Coded Aperture Imaging Coded Aperture Imaging Deep -learning Deep -learning
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| GB/T 7714 | Zhang, Minghua , Wan, Yuhong , Man, Tianlong et al. Interferenceless coded aperture correlation holography based on Deep-learning reconstruction of Single-shot object hologram [J]. | OPTICS AND LASER TECHNOLOGY , 2023 , 163 . |
| MLA | Zhang, Minghua et al. "Interferenceless coded aperture correlation holography based on Deep-learning reconstruction of Single-shot object hologram" . | OPTICS AND LASER TECHNOLOGY 163 (2023) . |
| APA | Zhang, Minghua , Wan, Yuhong , Man, Tianlong , Qin, Yi , Zhou, Hongqiang , Zhang, Wenxue . Interferenceless coded aperture correlation holography based on Deep-learning reconstruction of Single-shot object hologram . | OPTICS AND LASER TECHNOLOGY , 2023 , 163 . |
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Abstract ：
Significance To minimize the physical damage, phototoxicity, and photobleaching of the biological samples, microscopic imaging methods for the visualization of cells and tissues need to have the ability of noncontract and fast measuring of the three-dimensional (3D) sample information. Far-field optical microscopy, which has been widely applied for biomedical imaging, is one of the most direct and indispensable ways of capturing the dynamic 3D architecture of biological samples. In the optical imaging system, both the intensity and phase distribution of the illumination light field will be quantitatively modulated by the sample and finally transmitted to the detector plane. The demodulation of all the obtained information enables quantitative reconstructions of the samples' 3D spatial structure, morphology profile, and refractive index distribution. However, the existing photon detectors are only sensitive to the intensity distribution of the input light signal. The phase of the light field, which cannot be directly measured by the detector, can be quantitatively coded and decoded from the two-dimensional intensity distribution of the interference pattern using the interference characteristic of light. These basic ideas enable, in principle, fast 3D imaging, tomography, and quantitative phase-contrast imaging and hence benefit the visualization of the dynamic structural and biophysical characteristics of the samples. Furthermore, the details of the fine structures inside the sample can be obtained with improved imaging performance through super-resolution imaging and nonscanning 3D imaging, which are enabled by fluorescent self-interference imaging techniques. All these potential advantages in biological imaging have promoted the rapid development of interference microscopic techniques in the past decades. The interference imaging methods are classified according to the coherence properties of the light source used. The interference microscopic techniques using different light sources enable quantitative phase contrast imaging, nonscanning 3D imaging, and tomographic imaging to practically benefit the structural and functional visualization of 3D complex biological samples. The advantages, limitations, and potential applications of different interference imaging techniques are shown in Table 1. Progress Different optical systems and numerical methods have been designed to improve the spatial resolution, imaging speed, signal-to-noise ratio, and robustness to extend the application and modalities of the interference microscopic techniques. Among them, research is mainly focused on the applications of digital holography in quantitative phase contrast imaging (Fig. 4) and nonscanning 3D imaging (Fig. 6) of the sample. Parallel phase shifting (Fig. 8) and compressive sensing (Fig. 9) methods have been combined with digital holography to improve temporal and spatial resolution. Digital holography's large field-of-view, high speed, high resolution, and multidimensional imaging abilities have benefited both functional (Fig. 5) and structural (Fig. 7) imaging of biological samples. With optical sectioning imaging ability and less speckle noise, partially coherent digital holography has been applied for high accuracy phase contrast imaging of cells (Fig. 10) and, more importantly, for the visualization of the structure behind the tissues (Fig. 11). Because of its 3D tomographic imaging ability, optical coherence tomography (OCT) has become one of the most important tools for ophthalmic imaging (Fig. 13). With extended imaging modalities, polarization sensitive OCT has provided proof-of-principle results in the diagnosis of bronchial disease (Fig. 14). Incoherent holography can considerably improve the temporal resolution of the existing 3D laser scanning fluorescence microscope. Nonscanning 3D imaging of the fluorescence sample has been demonstrated (Fig. 15) with inherent super resolution (Figs. 18 and 19). While some of the major limitations of incoherent holography, such as the low axial resolution, have been addressed and improved (Fig. 16), the potential of this technique for high-resolution, high-speed 3D fluorescence imaging is still being explored. Successes have been achieved, e.g., by optimizing the 3D imaging performance of fluorescence holography via computational adaptive optics (Fig. 17). In localization-based super-resolution microscopy, the basic idea of interference microscopy has also been used as a point spread function modulation method. Therefore, the system's 3D resolution and imaging depth have been improved (Figs. 21 and 22). Conclusions and Prospects In this paper, we have reviewed the basic principles, recent progresses, advantages, limitations, applications, and potential future directions of the techniques. The system's 3D spatial resolution, imaging speed, and signal-to-noise ratio have been considerably improved during the past decades. Based on the multidimensional (3D spatial phase) imaging ability of interference microscopy, the applications of the methods for the structural and functional imaging of biological samples have been demonstrated. Further, the imaging modalities have been extended to provide even more data dimensions by combing the interference microscopic techniques such as OCT with polarization imaging method. In conclusion, in interference microscopy, the concurrently obtained structural and functional information of the sample is important for understanding the biological and biophysical mechanisms of the life processes. Interference microscopic techniques have benefited specific research in biological society by providing a powerful 3D imaging tool for both coherent and incoherent light sources. While several efforts have been made to improve system spatial resolution, another important direction in the future is to further develop functional imaging methods by exploring the potential of superior multidimensional data acquisition ability.
Keyword ：
optical coherence tomography optical coherence tomography fluorescence self-interference localization fluorescence self-interference localization microscopy microscopy bio-optics bio-optics digital holographic microscopy digital holographic microscopy three-dimensional imaging three-dimensional imaging interference interference incoherent holography incoherent holography
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| GB/T 7714 | Man Tianlong , Wan Yuhong , Jian Mengjing et al. Research Progress in Optical Interference Microscopy Toward Three-Dimensional Imaging of Biological Sample [J]. | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG , 2022 , 49 (15) . |
| MLA | Man Tianlong et al. "Research Progress in Optical Interference Microscopy Toward Three-Dimensional Imaging of Biological Sample" . | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG 49 . 15 (2022) . |
| APA | Man Tianlong , Wan Yuhong , Jian Mengjing , Zhang Wenxue , Zhang Minghua , Ma Teng et al. Research Progress in Optical Interference Microscopy Toward Three-Dimensional Imaging of Biological Sample . | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG , 2022 , 49 (15) . |
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Abstract ：
Motivated by the key role of point spread function in an imaging system, we propose an interferenceless coded aperture correlation holographic (I-COACH) technology with low speckle and high energy efficiency annular sparse coded phase mask (CPM) as system pupil to improve imaging performance. In the proposed method, a modified Gerchberg-Saxton (GS) algorithm is proposed to obtain a low speckle and high energy efficiency annular sparse CPM and to suppress speckle and increase the intensity of the holograms. Therefore, the randomly distributed amplitude in the bandwidth of the GS algorithm is replaced by the annular amplitude to determine the spatial position, and the band-limited random phase and quadratic phase are used as the initial phase to approximately meet band-limited conditions; meanwhile, in the iterative process of the algorithm, appropriate constraints are imposed on the information within and outside the band limit. All are used for obtaining the CPM with low speckle and high energy efficiency. Therefore, the proposed technique here is coined as low speckle I-COACH owing to the characteristics of CPM and imaging performances. The experimental results show that, under the same experi mental conditions, the proposed method can obtain holograms with low speckle and intensity enhancement of about 8%, and further improve the quality of reconstructed images due to the improvement signal-to-noise ratio (SNR) of the holograms. The proposed method provides a powerful reference method for further expanding the I-COACH system to the field oflow-intensity optical signals detection and imaging. (C) 2022 Optica Publishing Group
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| GB/T 7714 | Liu, Chao , Man, Tianlong , Wan, Yuhong . High-quality interferenceless coded aperture correlation holography with optimized high SNR holograms [J]. | APPLIED OPTICS , 2022 , 61 (3) : 661-668 . |
| MLA | Liu, Chao et al. "High-quality interferenceless coded aperture correlation holography with optimized high SNR holograms" . | APPLIED OPTICS 61 . 3 (2022) : 661-668 . |
| APA | Liu, Chao , Man, Tianlong , Wan, Yuhong . High-quality interferenceless coded aperture correlation holography with optimized high SNR holograms . | APPLIED OPTICS , 2022 , 61 (3) , 661-668 . |
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Abstract ：
Optical aberrations introduced by sample or system elements usually degrade the image quality of a microscopic imaging system. Computational adaptive optics has unique advantages for 3D biological imaging since neither bulky wavefront sensors nor complicated indirect wavefront sensing procedures are required. In this paper, a stochastic parallel gradient descent computational adaptive optics method is proposed for high-efficiency aberration correction in the fluorescent incoherent digital holographic microscope. The proposed algorithm possesses the advantage of parallelly estimating various aberrations with fast convergence during the iteration; thus, the wavefront aberration is corrected quickly, and the original object image is retrieved accurately. Owing to its high-efficiency adaptive optimization, the proposed method exhibits better performances for a 3D sample with complex and anisotropic optical aberration. The proposed method can be a powerful tool for the visualization of dynamic events that happen inside cells or thick tissues.
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| GB/T 7714 | Zhang, Wenxue , Man, Tianlong , Zhang, Minghua et al. Computational adaptive holographic fluorescence microscopy based on the stochastic parallel gradient descent algorithm [J]. | BIOMEDICAL OPTICS EXPRESS , 2022 , 13 (12) : 6431-6442 . |
| MLA | Zhang, Wenxue et al. "Computational adaptive holographic fluorescence microscopy based on the stochastic parallel gradient descent algorithm" . | BIOMEDICAL OPTICS EXPRESS 13 . 12 (2022) : 6431-6442 . |
| APA | Zhang, Wenxue , Man, Tianlong , Zhang, Minghua , Zhang, Lu , Wan, Yuhong . Computational adaptive holographic fluorescence microscopy based on the stochastic parallel gradient descent algorithm . | BIOMEDICAL OPTICS EXPRESS , 2022 , 13 (12) , 6431-6442 . |
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