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学者姓名：戎路
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Abstract ：
The modulation of a terahertz (THz) wave on amplitude, phase and polarization is important for the application of THz technology, especially in the field of imaging, and is one of the current research hotspots. Silicon-based, optically excited THz modulator is a wavefront modulation technique with a simple, compact and reconfigurable optical path. It can realize the dynamic modulation of THz wavefronts by only changing the projected two-dimensional pattern, but it still suffers from the problems of lower modulation efficiency and slower modulation rates. In this article, the Drude model in combination with the multiple thin layers structure model and Fresnel matrix method is used to compare the modulation efficiencies of three modulation modes and more factors. The method is more accurate than the popular proposed method, especially when the thickness of the excited photoconductive layers reaches a few hundred microns. In comparing the three modes, namely transmission, ordinary reflection and total internal reflection, it is found the total internal reflection modulation mode has the best modulation efficiency. Further, under this mode, the effects of three factors, including the lifetime of photo-excited carriers, the wavelength of pump light and the frequency of THz wave, on the performance of THz modulator are analyzed. The simulation results show that the realization of total internal reflection using silicon prisms is a simple and effective method to improve the modulation efficiency of a silicon-based optically excited THz modulator, which provides references for the design of a photo-induced THz modulator.
Keyword ：
total internal reflection total internal reflection light field modulation light field modulation terahertz wave modulator terahertz wave modulator
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| GB/T 7714 | Zhao, Chenyu , Wang, Dayong , Lin, Shufeng et al. Design Optimization of Silicon-Based Optically Excited Terahertz Wave Modulation [J]. | PHOTONICS , 2024 , 11 (3) . |
| MLA | Zhao, Chenyu et al. "Design Optimization of Silicon-Based Optically Excited Terahertz Wave Modulation" . | PHOTONICS 11 . 3 (2024) . |
| APA | Zhao, Chenyu , Wang, Dayong , Lin, Shufeng , Zhao, Jie , Wang, Yunxin , Rong, Lu . Design Optimization of Silicon-Based Optically Excited Terahertz Wave Modulation . | PHOTONICS , 2024 , 11 (3) . |
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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 ：
Optical hiding schemes based on visual cryptography usually hide secret information in multiple visual keys. However, the traditional visual keys are usually Mosaic patterns, which are easy to attract the attention of attackers, and limit their randomness and security. And each visual key needs a corresponding transport carrier, leading to limited hiding capacity. To solve these problems, this paper proposes an optical information hiding method based on speckle encoding and dual-multiplexing interferometry. This method uses natural speckle with high randomness to partial replace traditional visual keys, realizing the combination application of natural speckle keys and artificial visual keys. The optical properties of wavelength and diffraction distance multiplexing interference can hide multiple visual keys in a single image, which improves the hiding capacity. Simulation and optical experiments show that the proposed method has high security, large hiding capacity, imperceptibility and robustness.
Keyword ：
Interferometry Interferometry Speckle encoding Speckle encoding Optical hiding Optical hiding Dual multiplexing Dual multiplexing Visual keys Visual keys
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| GB/T 7714 | Zhu, Yusi , Mi, Zhaoke , Zhu, Yupeng et al. Optical information hiding based on speckle encoding with dual-multiplexing interferometry [J]. | OPTICS COMMUNICATIONS , 2024 , 573 . |
| MLA | Zhu, Yusi et al. "Optical information hiding based on speckle encoding with dual-multiplexing interferometry" . | OPTICS COMMUNICATIONS 573 (2024) . |
| APA | Zhu, Yusi , Mi, Zhaoke , Zhu, Yupeng , Ke, Changjun , Rong, Lu , Shi, Yishi . Optical information hiding based on speckle encoding with dual-multiplexing interferometry . | OPTICS COMMUNICATIONS , 2024 , 573 . |
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Abstract ：
The converging lens is one of the key components in high-resolution terahertz imaging. In this Letter, a binary diffractive lens is proposed for the scanning imaging system working at 278.6 GHz, in which a convergent beam with a waist diameter of 0.65 mm is generated, and 1 mm lateral imaging resolution is realized. This low-cost terahertz lens, constituted by concentric rings with different radii, is optimized by stimulated annealing algorithm and fabricated by three-dimensional printing. Compared with the conventional transmissive convex lens, higher resolution and enhanced imaging quality are achieved via smaller focal spot of the illumination beam. This type of lens would promote terahertz imaging closer to practical appli-cations such as nondestructive testing and other scenarios.
Keyword ：
binary diffractive lens binary diffractive lens terahertz imaging terahertz imaging phase modulation phase modulation three-dimensional printing three-dimensional printing
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| GB/T 7714 | Ning, Ran , Wang, Dayong , Rong, Lu et al. Binary diffractive lens with subwavelength focusing for terahertz imaging [J]. | CHINESE OPTICS LETTERS , 2023 , 21 (3) . |
| MLA | Ning, Ran et al. "Binary diffractive lens with subwavelength focusing for terahertz imaging" . | CHINESE OPTICS LETTERS 21 . 3 (2023) . |
| APA | Ning, Ran , Wang, Dayong , Rong, Lu , Zhao, Jie , Wang, Yunxin , Lin, Shufeng . Binary diffractive lens with subwavelength focusing for terahertz imaging . | CHINESE OPTICS LETTERS , 2023 , 21 (3) . |
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Abstract ：
With the development of continuous-wave terahertz (THz) sources and array detectors, the pursuit of high-fidelity real-time imaging is receiving significant attention within the THz community. Here, we report a real-time full-field THz phase imaging approach based on lensless Fourier-transform THz digital holography. A triangular interferometric layout is proposed based on an oblique illumination of 2.52 THz radiation, which is different from other lensless holographic configurations at other frequencies. A spherical reference beam is generated by a reflective parabolic mirror with minor propagation loss. The complex-valued images are reconstructed using a single inverse Fourier transform of the hologram without complex calculation of the diffraction propagation. The experimental result for a Siemens star validates the lateral resolution of similar to 346 mu m in the diagonal direction. Sub-pixel image registration and image stitching algorithms are applied to enlarge the area of the reconstructed images. The dehydration process of an aquatic plant leaf (Hottonia inflates) is monitored for the first time, to the best of our knowledge, at the THz band. Rapid variations in water content and morphology are measured with a time interval of 0.6 s and a total time of 5 min from a series of reconstructed amplitude and phase images, respectively. The proposed method has the potential to become a powerful tool to investigate spontaneous phenomena at the THz band. (C) 2022 Chinese Laser Press
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| GB/T 7714 | Zhang, Yaya , Zhao, Jie , Wang, Dayong et al. Lensless Fourier-transform terahertz digital holography for real-time full-field phase imaging [J]. | PHOTONICS RESEARCH , 2022 , 10 (2) : 323-331 . |
| MLA | Zhang, Yaya et al. "Lensless Fourier-transform terahertz digital holography for real-time full-field phase imaging" . | PHOTONICS RESEARCH 10 . 2 (2022) : 323-331 . |
| APA | Zhang, Yaya , Zhao, Jie , Wang, Dayong , Wang, Yunxin , Rong, Lu . Lensless Fourier-transform terahertz digital holography for real-time full-field phase imaging . | PHOTONICS RESEARCH , 2022 , 10 (2) , 323-331 . |
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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 ：
Massive usage scenarios prompt the prosperity of terahertz refractive index (THz RI) measurement methods. However, they are very difficult in measuring the full-field dynamical RI distributions of either solid samples without a priori thickness or liquid samples. In this study, we propose total internal reflection THz digital holography and apply it for measuring RI distributions for both solid and liquid samples dynamically. An RI measurement model is established based on an attenuated total reflection prism with a pitching angle. The pitching angle and the field of view can be numerically calculated from the spectrogram of the off-axis Fresnel hologram, which solves the adjustment of the visually opaque prism irradiated by the invisible THz beam. Full-field RI distributions of the droplets of solid-state soy wax and distilled water are obtained and compared with THz time-domain spectroscopy. The evaporation of an ethanol solution droplet is recorded, and the variation of the RI distribution at the sample-prism interface is quantitatively visualized with a temporal resolution of 10 Hz. The proposed method greatly expands the sample range for THz RI measurements and provides unprecedented insight into investigating spontaneous and dynamic THz phenomena. (C) 2022 Chinese Laser Press
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| GB/T 7714 | Wang, Dayong , Ma, Duoxuan , Li, Kunlun et al. Dynamic full-field refractive index distribution measurements using total internal reflection terahertz digital holography [J]. | PHOTONICS RESEARCH , 2022 , 10 (2) : 289-296 . |
| MLA | Wang, Dayong et al. "Dynamic full-field refractive index distribution measurements using total internal reflection terahertz digital holography" . | PHOTONICS RESEARCH 10 . 2 (2022) : 289-296 . |
| APA | Wang, Dayong , Ma, Duoxuan , Li, Kunlun , Zhang, Yaya , Zhao, Jie , Wang, Yunxin et al. Dynamic full-field refractive index distribution measurements using total internal reflection terahertz digital holography . | PHOTONICS RESEARCH , 2022 , 10 (2) , 289-296 . |
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Abstract ：
Continuous-wave terahertz computed tomography (THz-CT) is an important three-dimensional imaging method for probing the profile and inner properties of a sample's structure. We applied the total variation (TV) minimization iterative algorithm to squeeze 75% data acquisition time of THz-CT without the loss of reconstruction fidelity. The imaging system is built based on a 278.6 GHz avalanche diode source. A zero-order Bessel beam is generated by an axicon, for which the intensity profile remains essentially propagation invariant within the non-diffracting zone. The effectiveness of the proposed method is verified by using three optically opaque objects. The reconstruction results show that the TV-minimization algorithm can effectively suppress noise, artefacts, and shape distortion created in sparse angle reconstruction. (C) 2021 Optical Society of America
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| GB/T 7714 | Wang, Dayong , Ning, Ran , Li, Gaochao et al. 3D image reconstruction of terahertz computed tomography at sparse angles by total variation minimization [J]. | APPLIED OPTICS , 2022 , 61 (5) : B1-B7 . |
| MLA | Wang, Dayong et al. "3D image reconstruction of terahertz computed tomography at sparse angles by total variation minimization" . | APPLIED OPTICS 61 . 5 (2022) : B1-B7 . |
| APA | Wang, Dayong , Ning, Ran , Li, Gaochao , Zhao, Jie , Wang, Yunxin , Rong, Lu . 3D image reconstruction of terahertz computed tomography at sparse angles by total variation minimization . | APPLIED OPTICS , 2022 , 61 (5) , B1-B7 . |
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Abstract ：
本发明涉及一种电光相位调制器射频参数的测量方法与装置，用于解决电光相位调制器的射频参数测量过程中相位不可直接测量以及相位抖动问题，包括激光器、保偏光纤分路器、待测电光相位调制器、相位调节器、保偏光纤耦合器、分光器、光电探测器和MZ干涉环路相位稳定控制电路、矢量网络分析仪。相位调节器用于对光载波相位进行调节，待测电光相位调制器对光载波进行调制，两路信号经耦合后经过分光器分成两束，一束光经光电转换后进入矢量网络分析仪，另一束进入MZ控制电路，与相位调节器构成环路，实现对测量过程中由于光纤长度、温度、环境等的影响引起的相位抖动的补偿及控制，进而更准确地对待测电光相位调制器的射频参数进行测量。
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| GB/T 7714 | 王大勇 , 李沛晗 , 王云新 et al. 一种电光相位调制器射频参数的测量方法与装置 : CN202110663236.3[P]. | 2021-06-11 . |
| MLA | 王大勇 et al. "一种电光相位调制器射频参数的测量方法与装置" : CN202110663236.3. | 2021-06-11 . |
| APA | 王大勇 , 李沛晗 , 王云新 , 杨锋 , 戎路 , 赵洁 . 一种电光相位调制器射频参数的测量方法与装置 : CN202110663236.3. | 2021-06-11 . |
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Abstract ：
本发明公开了一种基于线偏振光和条纹反射的表面三维重建方法，当投影设备加载均匀照明图案时，调旋转相机前的线偏振片采集四张偏振图像计算线偏振度；当投影设备投影编码图案时，偏振片方向固定，采集多张经过物体表面面型调制的反射编码图像。信息处理设备配置为采集四张偏振图像，计算反射光线偏振度并分析天顶角分布；采集经过物体表面面型调制的反射编码图像，通过图像处理和解码过程得到相互匹配的投影设备发光点与相机像素点；将偏振分析得到的天顶角分布与入射平面三角形几何约束条件融合，得到物体表面法线信息，并通过对表面梯度积分重建物体面型。本发明消除偏振三维重建中天顶角二义性误差问题，并显著降低硬件成本和操作复杂度。
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| GB/T 7714 | 赵洁 , 蔡昂 , 王大勇 et al. 一种基于线偏振光和条纹反射的表面三维重建方法 : CN202110369458.4[P]. | 2021-04-06 . |
| MLA | 赵洁 et al. "一种基于线偏振光和条纹反射的表面三维重建方法" : CN202110369458.4. | 2021-04-06 . |
| APA | 赵洁 , 蔡昂 , 王大勇 , 戎路 , 王云新 . 一种基于线偏振光和条纹反射的表面三维重建方法 : CN202110369458.4. | 2021-04-06 . |
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