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学者姓名：王大勇
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Abstract ：
太赫兹波作为一种穿透性强、具有非电离性和惧水性的电磁波，可以穿透多种非金属、非极性介质材料。太赫兹计算层析成像技术基于傅里叶中心切片定理和直线传播模型，通过记录不同投影角度下的强度数据，采用滤波反投影等重建算法获得样品三维吸收系数分布和内外部结构信息分布。随着太赫兹成像器件的不断发展和应用场景的拓展，已发展出多种照明模式、成像光路和重建算法，并已在文物保护、骨密度测量和无损检测领域开展了应用探索。概述太赫兹计算层析技术的基本原理，并从提高重建质量、分辨率和采集效率三方面具体介绍太赫兹计算层析成像技术的最新研究。
Keyword ：
照明光场调控 照明光场调控 三维成像 三维成像 太赫兹成像 太赫兹成像 计算层析 计算层析
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| GB/T 7714 | 戎路 , 刘乂铭 , 宁冉 et al. 太赫兹计算层析成像研究进展（特邀） [J]. | 激光与光电子学进展 , 2024 , 61 (02) : 207-224 . |
| MLA | 戎路 et al. "太赫兹计算层析成像研究进展（特邀）" . | 激光与光电子学进展 61 . 02 (2024) : 207-224 . |
| APA | 戎路 , 刘乂铭 , 宁冉 , 赵洁 , 王云新 , 王大勇 . 太赫兹计算层析成像研究进展（特邀） . | 激光与光电子学进展 , 2024 , 61 (02) , 207-224 . |
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Abstract ：
A photonic-assisted distributed multiple-input and multiple-output (MIMO) chaotic radar is proposed based on multidimensional multiplexing. Reference chaotic (RC) optical signals and echo modulation signals from different remote stations (RSs) are transmitted to the central station (CS) and distinguished using wavelength division multiplexing. Signal-level fusion processing of all RSs' data and adjustment of operating frequency are simultaneously realized. Owing to the quasi-orthogonal waveform multiplexing and non-deterministic characteristics of chaotic signals, high spectrum efficiency and anti-interference capability can be ensured. Three functions, including broadband chaotic signal generation, and frequency up-and down-conversion, are integrated by polarization multiplexing. The radar becomes much more compact by sharing the laser and modulator. A distributed 2 $\times$ 2 MIMO chaotic radar with an effective bandwidth of 6 GHz in Ku-band is established, and the 2-D positions of the targets can be obtained by a back-projection algorithm. The experimental results show that the range and azimuth resolutions are 3.09 and 6.35 cm, respectively, and the average positioning error is less than 0.71 cm. A potential solution of high-precision 2-D positioning is provided for target detection in complex electromagnetic environments.
Keyword ：
Optical modulation Optical modulation Radar cross-sections Radar cross-sections Chaotic radar Chaotic radar Frequency conversion Frequency conversion Laser radar Laser radar multidimensional multiplexing multidimensional multiplexing Frequency modulation Frequency modulation Chaotic communication Chaotic communication frequency conversion frequency conversion microwave photonics microwave photonics Optical fibers Optical fibers Frequency division multiplexing Frequency division multiplexing Modulation Modulation Fiber optics Fiber optics
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| GB/T 7714 | Zhang, Yu , Zhang, Jing , Wang, Yunxin et al. Photonic-Assisted Distributed MIMO Chaotic Radar Based on Multidimensional Multiplexing [J]. | IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES , 2024 . |
| MLA | Zhang, Yu et al. "Photonic-Assisted Distributed MIMO Chaotic Radar Based on Multidimensional Multiplexing" . | IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES (2024) . |
| APA | Zhang, Yu , Zhang, Jing , Wang, Yunxin , Liu, Zhe , Wang, Dayong , Zhou, Yuanfen et al. Photonic-Assisted Distributed MIMO Chaotic Radar Based on Multidimensional Multiplexing . | IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES , 2024 . |
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Abstract ：
Dual-axis galvanometer is used as a common beam steering component in diverse illumination and imaging approaches. In this paper, we propose an uncorrelated uniform illumination approach based on dual-axis galvanometric scanning. Specially, we analyze the mechanism of galvanometric illumination and elucidate three main factors affecting its uniformity properties. In this illumination module, the laser beam is deflected rapidly by the galvanometer which is driven by triangular voltage signals, and then focused by an f-theta lens to illuminate the object at an equal lateral scanning velocity. This method has lower coherent noise than extended laser illumination, higher brightness than partial coherent illumination and higher uniformity than galvanometric Lissajous trajectory driven by sinusoidal signals.
Keyword ：
Uniform illumination Uniform illumination Lissajous scanning Lissajous scanning Galvanometer Galvanometer Speckle suppression Speckle suppression
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| GB/T 7714 | Rong, Lu , Zhang, Yuzhe , Ge, Lei et al. Uniformity optimization of galvanometric illumination [J]. | OPTICS AND LASER TECHNOLOGY , 2024 , 181 . |
| MLA | Rong, Lu et al. "Uniformity optimization of galvanometric illumination" . | OPTICS AND LASER TECHNOLOGY 181 (2024) . |
| APA | Rong, Lu , Zhang, Yuzhe , Ge, Lei , Wan, Min , Li, Jiawen , Liu, Yiming et al. Uniformity optimization of galvanometric illumination . | OPTICS AND LASER TECHNOLOGY , 2024 , 181 . |
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Abstract ：
For decades, terahertz (THz) microscopic imaging has been limited by the resolution of the system due to the larger wavelength, the power of the source, and the equivalent noise power of the detector, so a lot of research has focused on single-point scanning imaging. With the development of hardware, full-field THz imaging based on high-power continuous-wave THz sources have been developed such as the direct intensity imaging method and lensless coherent imaging. In particular, the THz direct intensity imaging method requires no complicated computational reconstruction, while the high resolution, as a key issue, still needs to be improved. In this paper, the rotating coherent scattering microscopy was applied to THz imaging for the first time. Here, we designed and fabricated a hemisphere lens with high-resistance silicon. The tilted hemisphere lens transformed the incident divergent beam into a plane wave, and the total internal reflection occurred in the planar surface within the hemispherical lens, and generated evanescent waves in the rare medium. At the same time, the sample was placed very close to the plane of the hemispherical lens, so that the sample was illuminated by the evanescent waves. The scattered waves carried high frequency information to the far field, and thus through an objective, the super-resolution imaging was achieved along a single direction. Then, the hemispherical lens was rotated to obtain coherent scattering microscopic images under different evanescent wave illumination angles. Finally, the full-field super-resolution imaging results were obtained through incoherent superposition.
Keyword ：
full-field full-field evanescent wave evanescent wave rotating coherent scattering microscopy rotating coherent scattering microscopy terahertz imaging terahertz imaging super-resolution super-resolution
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| GB/T 7714 | Ma, Duoxuan , Zhao, Jie , Wang, Dayong et al. Full-Field Super-Resolution Terahertz Imaging Based on Rotating Coherent Scattering Microscopy [J]. | APPLIED SCIENCES-BASEL , 2023 , 13 (2) . |
| MLA | Ma, Duoxuan et al. "Full-Field Super-Resolution Terahertz Imaging Based on Rotating Coherent Scattering Microscopy" . | APPLIED SCIENCES-BASEL 13 . 2 (2023) . |
| APA | Ma, Duoxuan , Zhao, Jie , Wang, Dayong , Lin, Hao , Rong, Lu , Wang, Yunxin et al. Full-Field Super-Resolution Terahertz Imaging Based on Rotating Coherent Scattering Microscopy . | APPLIED SCIENCES-BASEL , 2023 , 13 (2) . |
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Abstract ：
In this paper, an iterative denoising phase retrieval method is proposed to solve the twin-image problem in continuous-wave terahertz in-line digital holography. The iterative algorithm is based on the classical error reduction algorithm by adding the positive absorption constraint and a new image denoising for the object field to improve the quality of the reconstructed images. At certain geometrical parameter, the twin-image can be treated as noise superimposed in the object plane. The object field is considered as a complex function affected by the twin-image, and then the denoising process embedded in each iteration is applied to the real and imaginary parts of the object field, respectively. The validity of this approach is demonstrated by the high-quality imaging of samples like the Siemens star and the cicada's wing, which are almost free from the twin-image. Also, the proposed method exhibits good robustness to noises existing in the hologram, and the reconstructed images show better quality compared with other popular phase retrieval methods and denoising algorithm. This work would be helpful to expand the application of continuous-wave terahertz in-line digital holography in biomedical imaging and nondestructive testing.
Keyword ：
Phase retrieval Phase retrieval In-line digital holography In-line digital holography Terahertz imaging Terahertz imaging Image denoising Image denoising Twin-image Twin-image
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| GB/T 7714 | Jin, Xiaoyu , Zhao, Jie , Wang, Dayong et al. Iterative denoising phase retrieval method for twin-image elimination in continuous-wave terahertz in-line digital holography [J]. | OPTICS AND LASERS IN ENGINEERING , 2022 , 152 . |
| MLA | Jin, Xiaoyu et al. "Iterative denoising phase retrieval method for twin-image elimination in continuous-wave terahertz in-line digital holography" . | OPTICS AND LASERS IN ENGINEERING 152 (2022) . |
| APA | Jin, Xiaoyu , Zhao, Jie , Wang, Dayong , Rong, Lu , Wang, Yunxin , Healy, John J. et al. Iterative denoising phase retrieval method for twin-image elimination in continuous-wave terahertz in-line digital holography . | OPTICS AND LASERS IN ENGINEERING , 2022 , 152 . |
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Abstract ：
提出了一种由三维打印技术制作的用于0.3 THz波束调控的二元相位型衍射透镜，可产生轴向焦深为25 mm、腰斑直径为1 mm的太赫兹聚焦波束。将该聚焦波束应用于连续太赫兹波计算机辅助层析成像，不仅将成像分辨率提高到1.5 mm，而且由于扩大了系统景深，提高了成像保真度。这类利用三维打印技术制作的二元衍射元件可有效应用于低频太赫兹波段的光束调控，为太赫兹成像系统的性能优化以及聚焦元件的设计制备提供一种有效途径。
Keyword ：
信息光学 信息光学 太赫兹计算机辅助层析 太赫兹计算机辅助层析 三维打印技术 三维打印技术 二元衍射透镜 二元衍射透镜 光束调控 光束调控
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| GB/T 7714 | 王大勇 , 宁冉 , 金晓宇 et al. 3D打印衍射元件的高分辨太赫兹计算机辅助层析成像研究（特邀） [J]. | 光子学报 , 2022 , 51 (07) : 113-124 . |
| MLA | 王大勇 et al. "3D打印衍射元件的高分辨太赫兹计算机辅助层析成像研究（特邀）" . | 光子学报 51 . 07 (2022) : 113-124 . |
| APA | 王大勇 , 宁冉 , 金晓宇 , 戎路 , 赵洁 , 王云新 et al. 3D打印衍射元件的高分辨太赫兹计算机辅助层析成像研究（特邀） . | 光子学报 , 2022 , 51 (07) , 113-124 . |
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Abstract ：
In the THz band, the spoof surface plasmon polariton (SSP) can limit the light to the designed specific spatial frequency by constructing a sub-wavelength structure on the metal surface. This ability makes it possible to break through the diffraction limit of THz imaging. In this paper, a one- dimensional metal groove structure is used to generate the SSP, and the frequency shift characteristics of the object's spatial spectrum under the excitation of a 2.52THz beam are analyzed. On this basis, a grating-coupling-based SSP excitation structure is designed, which consists of a combined array of subwavelength metal grooves and subwavelength slits with different periods. This structure is used to generate strong intensity and make full use of the incident beam. It is promising for generating illumination beams for terahertz far-field super-resolution imaging of subwavelength-spacing samples.
Keyword ：
terahertz terahertz Spoof plasmon Spoof plasmon surface waves surface waves
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| GB/T 7714 | Li, Kunlun , Wang, Dayong , Rong, Lu et al. Design and simulation comparison of terahertz surface wave based on grating coupling method [J]. | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XII , 2022 , 12318 . |
| MLA | Li, Kunlun et al. "Design and simulation comparison of terahertz surface wave based on grating coupling method" . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XII 12318 (2022) . |
| APA | Li, Kunlun , Wang, Dayong , Rong, Lu , Zhao, Jie , Lin, Shufeng , Wang, Yunxin et al. Design and simulation comparison of terahertz surface wave based on grating coupling method . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XII , 2022 , 12318 . |
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Abstract ：
Fourier ptychographic microscopy (FPM) is an effective computational imaging method that incorporates many advantages such as large field of view, high resolution, label-free, and quantitative phase-contrast imaging. Typically, an LED array is used as the illumination source. Due to the small size and narrow spectral width of the LED unit, FPM is usually treated as a coherent imaging system. However, practically, each LED unit is a spatially-extended light source with a certain emitting area, rather than an ideal point source. The ideal point source approximation will decrease the quality of the reconstructed image, to a certain extent. In this paper, the spatial coherence characteristics of FPM system based on LED illumination is analyzed, and it is found that the optical field on the object plane is partially coherent. Thus, the artifacts exist when the coherent transfer function is used as the frequency domain constraint. To address this problem, a Butterworth-weighted transfer function is proposed as the frequency domain constraint in the iterative reconstruction process. The simulation and experimental results demonstrate that this new constraint approach can not only reduce the ringing effect in low-resolution images, but also improve the reconstruction quality due to its following better the actual physical mechanism inherent in FPM. In addition, it may reduce the requirement of the spatial coherence of the illumination source, which has great significance for promoting the application of FPM.
Keyword ：
phase retrieval algorithm phase retrieval algorithm Fourier ptychographic microscopy Fourier ptychographic microscopy partially coherent imaging partially coherent imaging Butterworth-weighted transfer function Butterworth-weighted transfer function
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| GB/T 7714 | Zhao, Jie , Wang, Dayong , Han, Yaqian et al. Improved reconstruction with Butterworth-weighted transfer function for Fourier ptychographic microscopy [J]. | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XII , 2022 , 12318 . |
| MLA | Zhao, Jie et al. "Improved reconstruction with Butterworth-weighted transfer function for Fourier ptychographic microscopy" . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XII 12318 (2022) . |
| APA | Zhao, Jie , Wang, Dayong , Han, Yaqian , Lin, Shufeng , Wang, Yunxin , Rong, Lu . Improved reconstruction with Butterworth-weighted transfer function for Fourier ptychographic microscopy . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XII , 2022 , 12318 . |
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Abstract ：
本发明提出了一种基于偏振复用的微波光子雷达收发终端功能集成方法，用于解决现有方法中，由于雷达探测信号的产生和回波信号的接收终端由独立的部分实现，导致链路体积大、难于集成和易受外界干扰的问题。本发明利用偏振复用双驱动马赫‑曾德尔调制器的两个正交偏振态分别实现雷达探测信号的产生与目标回波信号的接收操作。通过调谐直流偏置电压，使上路子调制器工作在最大传输点，完成二倍频线性调频信号的产生，并为回波信号的去斜接收操作提供了必要的参考光信号。接下来，利用下路子调制器将目标回波信号调制到光载波上，并调谐其直流偏置电压，使其工作在正交偏置状态，为后续的光域去斜操作提供了前期基础。最后，利用偏振控制器和起偏器将参考光信号与回波光信号的偏振态混合，完成目标回波信号的去斜处理，实现目标距离信息的求解。
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| GB/T 7714 | 王云新 , 王大勇 , 侯雪缘 et al. 一种基于偏振复用的微波光子雷达收发终端功能集成方法 : CN202210804387.0[P]. | 2022-07-08 . |
| MLA | 王云新 et al. "一种基于偏振复用的微波光子雷达收发终端功能集成方法" : CN202210804387.0. | 2022-07-08 . |
| APA | 王云新 , 王大勇 , 侯雪缘 , 杨锋 , 何铮 , 姚锦川 . 一种基于偏振复用的微波光子雷达收发终端功能集成方法 : CN202210804387.0. | 2022-07-08 . |
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Abstract ：
本发明涉及一种基于振镜扫描系统的太赫兹计算层析三维成像方法，通过振镜扫描系统使得太赫兹光束快速转向，从而提供高质量且均匀的阵列太赫兹波光束，通过振镜畸变矫正方法使得经过振镜偏转的太赫兹波光束都能垂直穿透样品，进而在面阵探测器中获取到强度信息，最后使用计算层析重建算法，重建出无扫描畸变的样品三维内部结构吸收图。相比传统点扫太赫兹计算层析成像技术，该发明保证了重建质量的同时又提高了成像速度，是一种高保真度、快速的新型连续太赫兹波计算层析三维成像解决方案。
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| GB/T 7714 | 戎路 , 李高超 , 王大勇 et al. 一种基于振镜扫描系统的太赫兹计算层析三维成像方法 : CN202210164446.2[P]. | 2022-02-22 . |
| MLA | 戎路 et al. "一种基于振镜扫描系统的太赫兹计算层析三维成像方法" : CN202210164446.2. | 2022-02-22 . |
| APA | 戎路 , 李高超 , 王大勇 , 赵洁 , 林述锋 , 王云新 . 一种基于振镜扫描系统的太赫兹计算层析三维成像方法 : CN202210164446.2. | 2022-02-22 . |
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