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学者姓名：刘世炳
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Abstract ：
In this paper, using laser direct writing technology, a femtosecond laser was used to process a periodic grating structure on a 99.99% tungsten target. The specific parameters of the laser are as follows: a center wavelength of 800 nm, pulse width of 35 fs, repetition rate of 1 kHz, and maximum single pulse energy of 3.5 mJ. The surface morphology of the samples was characterized and analyzed using a scanning electron microscope (SEM, Coxem, Republic of Korea) and atomic force microscope (AFM, Being Nano-Instruments, China). The thermal radiation infrared spectrum of the tungsten target with grating structures was measured using a Fourier transform infrared spectrometer (Vertex 70, Bruker, Germany). The results show that as the laser fluence increases, the depth of the groove, the width of the nanostructure region, and the width of the direct writing etching region all increase. The peak thermal radiation enhancement appears around the wavenumber of 900 cm-1 when the laser fluence is sufficient. Additionally, its intensity initially increases and then decreases as the laser fluence increases. If the grating period is too large, the impact on thermal radiation is not clear. The heating temperature significantly affects the intensity of thermal radiation but does not have a noticeable effect on the position of thermal radiation peaks. Moreover, the relative weighting of different wavenumbers changes as the temperature increases.
Keyword ：
direct writing processing direct writing processing thermal radiation thermal radiation femtosecond laser femtosecond laser grating structure grating structure
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| GB/T 7714 | Guo, Ruxue , Zhou, Ping , Zhang, Wanyun et al. Study on the Thermal Radiation Characteristics of Tungsten Surface Grating Structures Prepared by Femtosecond Laser Direct Writing [J]. | COATINGS , 2024 , 14 (8) . |
| MLA | Guo, Ruxue et al. "Study on the Thermal Radiation Characteristics of Tungsten Surface Grating Structures Prepared by Femtosecond Laser Direct Writing" . | COATINGS 14 . 8 (2024) . |
| APA | Guo, Ruxue , Zhou, Ping , Zhang, Wanyun , Song, Haiying , Liu, Shibing . Study on the Thermal Radiation Characteristics of Tungsten Surface Grating Structures Prepared by Femtosecond Laser Direct Writing . | COATINGS , 2024 , 14 (8) . |
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Abstract ：
For linearly polarized femtosecond laser-induced periodic nanostructures on a metal surface, the underlying physics of self-formation patterns is yet to be fully explained. We demonstrated here that the stabilized periodic interface electrostatic field (Coulomb field) arising from the surface phase-locking resonant dominates the self -formation of ripple structures. The kinetics of ultrafast laser ablation on solid surface were discussed. The threshold fluence and upper limit fluence for self-formation of ripple structures were calculated. The underlying mechanisms were clarified with both simulation and experimental results. Analytical formula for the interspace between ripples (i.e., wavelength of surface Langmuir wave) was developed. As illustrated by the experimental results, the competition of the two ablation mechanisms, namely surface Coulomb ablation and direct ultrafast laser ablations, was shown to result in distinct structuring patterns for a typical Gaussian pulse laser irradiation on the target surface at the appropriate laser energy fluence.
Keyword ：
Coulomb ablation Coulomb ablation Femtosecond laser Femtosecond laser Subwavelength structure Subwavelength structure Surface two-plasmon resonance effect Surface two-plasmon resonance effect
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| GB/T 7714 | Wang, Bing , Wang, Yang , Song, Haiying et al. Threshold effect on the femtosecond laser-induced periodic subwavelength structure: An analytical approach [J]. | OPTICS AND LASER TECHNOLOGY , 2023 , 158 . |
| MLA | Wang, Bing et al. "Threshold effect on the femtosecond laser-induced periodic subwavelength structure: An analytical approach" . | OPTICS AND LASER TECHNOLOGY 158 (2023) . |
| APA | Wang, Bing , Wang, Yang , Song, Haiying , Lam, Yee Cheong , Shaymaa, Elshaimaa Memara , Liu, Shibing . Threshold effect on the femtosecond laser-induced periodic subwavelength structure: An analytical approach . | OPTICS AND LASER TECHNOLOGY , 2023 , 158 . |
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Abstract ：
微坑阵列结构具有耐磨损、抗腐蚀、提高生物相容性与抗菌性等特点，应用十分广泛。飞秒激光独特的超快加工效应使其在高质量微坑加工中独具优势。应用随机森林回归(RFR)算法和人工神经网络(ANN)算法对飞秒激光加工的微坑阵列几何形状和质量进行了预测，分析了激光加工参数对微坑的直径、深度和表面粗糙度(Ra)的影响。通过均方根误差、确定系数以及平均绝对误差对RFR与ANN 2种模型的预测能力进行了评估。结果显示：ANN模型的整体预测准确率相比RFR略高一些，R~2值为0.81,直径、深度、粗糙度预测的R~2分别为0.67、0.79、0.85。利用数据增强方法对数据集进行了扩增，ANN模型的准确率进一步提高，整体R~2为0.91,直径、深度、粗糙度预测的R~2分别为0.81、0.91、0.95。研究结果表明，ANN模型在飞秒激光加工微坑阵列的预测中相比RFR具有更优异的预测性能，且随着数据量的增加，这种优势更加明显，也进一步验证了ANN模型的潜力。
Keyword ：
机器学习 机器学习 参数预测 参数预测 激光加工 激光加工 人工神经网络 人工神经网络
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| GB/T 7714 | 王泽林 , 王冰 , 宋海英 et al. 基于机器学习的飞秒激光加工微坑阵列特征预测 [J]. | 材料保护 , 2023 , 56 (10) : 67-73,129 . |
| MLA | 王泽林 et al. "基于机器学习的飞秒激光加工微坑阵列特征预测" . | 材料保护 56 . 10 (2023) : 67-73,129 . |
| APA | 王泽林 , 王冰 , 宋海英 , 刘世炳 . 基于机器学习的飞秒激光加工微坑阵列特征预测 . | 材料保护 , 2023 , 56 (10) , 67-73,129 . |
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Abstract ：
Surface nanostructuring could enhance surface properties such as strength, self-cleaning, anti-fog and anti-bacterial properties. Femtosecond laser-induced periodic surface structures (LIPSS) is a nanoscale structure created with laser technique. However, its quality is significantly influenced by the complicated interrelationship between the various laser processing and material parameters. Hitherto the selection of the appropriate laser parameters mainly depends on personal experience in conjunction with many time-consuming experimental trials. To have a simple, fast, and intelligent process, a hybrid machine learning method is proposed to determine the optimized processing window for femtosecond laser-induced nanostructures. Firstly, k-means clustering method was applied to automatically classify the laser-induced nanostructures into good and bad quality classes. Before clustering, dimensionality reduction methods were applied to reduce the high dimension of image data and to extract features. Different dimensionality reduction methods including principal component analysis (PCA), local linear embedding (LLE), t-random adjacent embedding (t-SNE) and transfer learning were explored. Transfer learning showed a much better result compared with other dimensionality reduction methods. Transfer learning VGG19 model achieved the highest accuracy of 90.6 %. After clustering, the image was labelled as good and bad clusters accordingly. The labeled image was trained using artificial neural network (ANN), random forest (RF), decision tree (DT), support vector machine (SVM), k-nearest neighbors (KNN) and Naive Bayesian Classifier (NBC) algorithms for the prediction of laser processing results. The results show that DT gives the best accuracy of 96.7 %. Finally, an optimal laser processing window for femtosecond laser-induced nanostructures was determined.
Keyword ：
Intelligent manufacturing Intelligent manufacturing Laser machining Laser machining Transfer learning Transfer learning Optimal process window Optimal process window
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| GB/T 7714 | Wang, Bing , Wang, Peng , Song, Jie et al. A hybrid machine learning approach to determine the optimal processing window in femtosecond laser-induced periodic nanostructures [J]. | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 2022 , 308 . |
| MLA | Wang, Bing et al. "A hybrid machine learning approach to determine the optimal processing window in femtosecond laser-induced periodic nanostructures" . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 308 (2022) . |
| APA | Wang, Bing , Wang, Peng , Song, Jie , Lam, Yee Cheong , Song, Haiying , Wang, Yang et al. A hybrid machine learning approach to determine the optimal processing window in femtosecond laser-induced periodic nanostructures . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 2022 , 308 . |
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Abstract ：
A very prominent characteristic of the femtosecond laser induced nanostructures is the periodic shorter than laser wavelength. To improve its actual application value, in this work, we studied the characteristic of nano-texturing fabrication by fs laser scanning W (tungsten) metal surface, the regular uniform large area nano-gratings are fast fabricated on flat surface and cylindrical surface.
Keyword ：
Large area nano-gratings Large area nano-gratings Different metal surfaces Different metal surfaces Femtosecond laser Femtosecond laser
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| GB/T 7714 | Song, Haiying , Liu, Shibing . Large Area Nano-gratings Fast Fabricated by Femtosecond Laser on Different Metal Surfaces [J]. | PROCEEDINGS OF THE 38TH INTERNATIONAL MATADOR CONFERENCE , 2022 : 83-89 . |
| MLA | Song, Haiying et al. "Large Area Nano-gratings Fast Fabricated by Femtosecond Laser on Different Metal Surfaces" . | PROCEEDINGS OF THE 38TH INTERNATIONAL MATADOR CONFERENCE (2022) : 83-89 . |
| APA | Song, Haiying , Liu, Shibing . Large Area Nano-gratings Fast Fabricated by Femtosecond Laser on Different Metal Surfaces . | PROCEEDINGS OF THE 38TH INTERNATIONAL MATADOR CONFERENCE , 2022 , 83-89 . |
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Abstract ：
In this paper, the effect of femtosecond laser irradiation on the wettability of semiconductor materials InAs and GaAs coated with silver film was studied. The experimental results show that the semiconductor material can be transformed from hydrophilic to hydrophobic. Laser power and scanning period play a decisive role in the morphology of micro-nano structures, and different micro-nano structures have different hydrophobicity. The higher the surface roughness is, the greater the contact angle is, and the maximum contact angle can reach 143 & DEG;. The existence of silver film further increases the surface roughness in two different ways. For InAs samples, the existence of silver film does not change the surface morphology of the micro-nano structure, which is fish-scale structure. However, the size of the microstructure is increased, and the hydrophobicity is significantly improved. The contact angle increases from 122.6 & DEG; to 139.8 & DEG;. For the GaAs sample, the existence of the silver film changed the surface morphology of the micro-nano structure. The morphology changed from a laser induced periodic structure to the convex structure, and the contact angle increased from 122 & DEG; to 143 & DEG;. The process can be used for surface modification of semiconductor materials, which is well applied to optoelectronic devices to achieve self-cleaning and anticorrosion functions of the surface and prolong the service life of optoelectronic devices.
Keyword ：
silver film-assisted semiconductor materials silver film-assisted semiconductor materials hydrophobic property hydrophobic property femtosecond laser micro/nano fabrication femtosecond laser micro/nano fabrication
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| GB/T 7714 | Liu, Shuang , Song, Haiying , Wang, Shengnan et al. Surface micro-nano hydrophobic structuring on silver-coated semiconductor substrate by femtosecond laser irradiation [J]. | JOURNAL OF LASER APPLICATIONS , 2022 , 34 (1) . |
| MLA | Liu, Shuang et al. "Surface micro-nano hydrophobic structuring on silver-coated semiconductor substrate by femtosecond laser irradiation" . | JOURNAL OF LASER APPLICATIONS 34 . 1 (2022) . |
| APA | Liu, Shuang , Song, Haiying , Wang, Shengnan , Du, Bairui , Wang, Bing , Emara, Elshaimaa M. et al. Surface micro-nano hydrophobic structuring on silver-coated semiconductor substrate by femtosecond laser irradiation . | JOURNAL OF LASER APPLICATIONS , 2022 , 34 (1) . |
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Abstract ：
The optical filter based on the micro-nano structure on the material surface is an important optical device, which is widely used in many fields. The filter is fabricated on the substrate with different shapes and sizes of micro-nano array structure, and the wavelength selectivity is realized by adjusting the processing parameters. In this paper, the finite-difference time-domain (FDTD) method is used to simulate the spectral properties of periodic array structures on the Au surface, and the spectral response characteristics of different surface structural parameters to the incident light are obtained. The simulation results show that the periodic pore array has a directional modulation function on the reflectivity and transmittance of the material surface. In the same circular aperture array structure, the wavelength selection ability is proportional to the interval distance of the array period, but the transmission peak linewidth decreases with the increase of the interval distance. The structural spectrum of the cylindrical array is closely related to the structural period. The period of the array structure increases in proportion, the center wavelengths of the reflection and transmission peak of the spectrum are red-shifted. When the height of the array structure increases proportionally, the positions of the center wavelengths of the reflection and transmission peak remain almost unchanged. When the period of the array structure increases, the center wavelength of the reflection and transmission peaks appear red-shifted, and the line width is also narrowed. For the periodic ring array structure, as the inner diameter increases, the reflection peak is significantly red-shifted, and the smaller the ring width, the faster the red-shift of the reflection peak with the wavelength. By controlling the ratio of inner diameter-to-outer diameter, the spectral characteristics of the structured surface can be effectively controlled. These simulation results provide a basis for the preparation of optical filters in the future and a new idea for the study of micro-nano characteristic structures on the surface of materials.
Keyword ：
surface multilevel micro-nano structures surface multilevel micro-nano structures spectral selective manipulation spectral selective manipulation FDTD FDTD
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| GB/T 7714 | Guo, Xiangjing , Song, Haiying , Du, Bairui et al. Study on Spectral Selective Manipulation Characteristics of Surface Multilevel Micro-Nano Structures by FDTD Simulation [J]. | INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES , 2022 , 23 (5) . |
| MLA | Guo, Xiangjing et al. "Study on Spectral Selective Manipulation Characteristics of Surface Multilevel Micro-Nano Structures by FDTD Simulation" . | INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES 23 . 5 (2022) . |
| APA | Guo, Xiangjing , Song, Haiying , Du, Bairui , Tan, Shengwang , Liu, Shibing . Study on Spectral Selective Manipulation Characteristics of Surface Multilevel Micro-Nano Structures by FDTD Simulation . | INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES , 2022 , 23 (5) . |
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Abstract ：
The transient dynamics of anisotropic properties of GaAs was systematically studied by polarization-dependent ultrafast time-resolved transient absorption. Our findings revealed that the anisotropy of reflectivity was enhanced in both pump-induced and probe-induced processes, suggesting an extraordinary resonance absorption of photon-phonon coupling (PPC) with intrinsic anisotropic characteristic in carrier relaxation, regardless of the concrete crystallinity and orientation of GaAs sample. The results, delivering in-depth cognition about the polarization-dependent ultrafast carrier dynamics, also proved the paramount importance of interaction between polarized laser and semiconductor.
Keyword ：
GaAs GaAs photon-phonon coupling photon-phonon coupling ultrafast pump-probe ultrafast pump-probe polarization-dependence polarization-dependence
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| GB/T 7714 | Li, Ya-Chao , Ge, Chao , Wang, Peng et al. Polarization-dependent ultrafast carrier dynamics in GaAs with anisotropic response [J]. | CHINESE PHYSICS B , 2022 , 31 (6) . |
| MLA | Li, Ya-Chao et al. "Polarization-dependent ultrafast carrier dynamics in GaAs with anisotropic response" . | CHINESE PHYSICS B 31 . 6 (2022) . |
| APA | Li, Ya-Chao , Ge, Chao , Wang, Peng , Liu, Shuang , Ma, Xiao-Ran , Wang, Bing et al. Polarization-dependent ultrafast carrier dynamics in GaAs with anisotropic response . | CHINESE PHYSICS B , 2022 , 31 (6) . |
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Abstract ：
Natural structural colors inspire people to obtain the technology of spectral characteristics by designing and preparing micro-nano structures on the material's surface. In this paper, the finite difference time domain (FDTD) method is used to simulate the spectral selectivity of micro-nano grating on an Au surface, and the spectral response characteristics of different physical parameters to the incident light are obtained. The results show that, when the grating depth is shallow, the absorption peaks of TM polarized incident light on the material surface take on redshifts with the increase in the grating period. Meanwhile, when the depth-width ratio of the grating structure is high, the absorption peak appears in the reflection spectrum and presents a linear red shift with the increase in the grating period after the linearly polarized light TE wave incident on the surface of the micro-nano structure. At the same time, the wavelength of the absorption peak of the reflection spectrum and the grating period take on one-to-one correspondence relations, and when the TM polarized light is incident, the reflection spectrum exhibits obvious selective absorption characteristic peaks at certain grating periods (for example, when the period is 0.4 mu m, there are three absorption peaks at the wavelengths of 0.7, 0.95, and 1.55 mu m). These simulation results can provide a good theoretical basis for the preparation of micro-nano structures with spectral regulation function in the practical application.
Keyword ：
surface micro-nano structures surface micro-nano structures spectral characteristics spectral characteristics FDTD simulations FDTD simulations
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| GB/T 7714 | Ma, Xiaoran , Du, Bairui , Tan, Shengwang et al. Spectral Characteristics Simulation of Topological Micro-Nano Structures Based on Finite Difference Time Domain Method [J]. | NANOMATERIALS , 2021 , 11 (10) . |
| MLA | Ma, Xiaoran et al. "Spectral Characteristics Simulation of Topological Micro-Nano Structures Based on Finite Difference Time Domain Method" . | NANOMATERIALS 11 . 10 (2021) . |
| APA | Ma, Xiaoran , Du, Bairui , Tan, Shengwang , Song, Haiying , Liu, Shibing . Spectral Characteristics Simulation of Topological Micro-Nano Structures Based on Finite Difference Time Domain Method . | NANOMATERIALS , 2021 , 11 (10) . |
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Abstract ：
Objective In the research of inertial confinement fusion, the conventional center ignition scheme has very high requirements on the uniformity and symmetry of deuterium-tritium (D-T) pellet pellet compression and driver energy. To reduce these requirements, a fast ignition scheme has been proposed. In this scheme, the pellet would be first compressed to a state of high temperature and density, and then, the plasma would be driven by a short high-intensity laser pulse to produce several MeV magnitude hot electrons, which would then need to travel for a distance of dozens of micrometers to deposit their energy into a small volume of the pellet, igniting the pellet. Finally, fusion would be realized. Therefore, the fast ignition scheme needs a high beam quality of hot electrons. However, the Weibel, filament, and two-stream instabilities may decrease the beam quality of hot electrons during their transmission, which severely restricts the realization of the fast ignition scheme of inertial confinement fusion. In this study, a conical-entry-multilayer target is proposed to improve the collimation and transport efficiency of hot electrons. We hope that the model established in this study has a good significance for improving the beam quality of hot electrons in fast ignition. Methods In this study, the generation and transport characteristics of hot electrons in the interaction between an intense laser and the conical-entry-multilayer target are investigated using the two-dimensional particle-in-cell simulation program Vorpal. We design two types of targets, namely, multilayer target and conical-entry-multilayer target. The multilayer target is mainly used as a reference to determine whether the conical-entry-multilayer target can improve the collimation and transport efficiency of hot electrons. By comparing the energy density distribution, longitudinal and transverse distribution, energy spectrum, and divergence angle distribution of hot electrons in the two targets, it is proved that the collimation and transport efficiency of hot electrons in the conical-entry-multilayer target is higher than that of hot electrons in the multilayer target. By analyzing the generation mechanism and transport process of hot electrons in the conical-entry-multilayer target, the reasons for the enhancement of collimation and transport efficiency of hot electrons in the conical-entry-multilayer targets are clarified. Results and Discussions Compared with the multilayer target with no cone structure, in the conical-entrymultilayer target, the energy density of hot electrons near the y-axis in the region of x>12 lambda(0) is increased (Fig. 2) . In the multilayer target, the temperature of hot electrons behind the target is 0. 73 MeV, and in the conical-entrymultilayer target, hot electrons behind the target can be divided into three parts, and their temperatures are 0.80, 1.31, and 13. 17 MeV ( Fig. 4). The results show that the temperatures of hot electrons in the conical-entrymultilayer target are higher. The divergence angle of hot electrons in both targets can be controlled mainly in the range of - 38 degrees -38 degrees , but the energy of hot electrons with divergence angle between - 38 degrees and 38 degrees in the conicalentry-multilayer target increases by -0. 6 times compared with that in the multilayer target (Fig. 4). The above results show that the collimation and transport efficiency of hot electrons in the conical-entry-multilayer target is higher than that of hot electrons in the multilayer target. There are three reasons for the efficiency enhancement: first, several hot electrons are pulled out from the cone wall using the laser (Fig. 5), and these hot electrons are guided to the rear of the target, which directly increases the hot electron current at the rear of the target; second, the focusing effect of the cone wall on the laser enhances the ponderomotive force near the cone tip (Fig. 6) , and thus, the number and energy of hot electrons generated by the ponderomotive force acceleration near the cone tip increase significantly; third, a stronger self-generated magnetic field distribution is generated behind the cone tip (Fig. 8), and a stronger self-generated magnetic field distribution has a stronger binding effect on hot electrons. Conclusions In this study, the collimation and transport characteristics of hot electrons generated in the interaction between an intense laser and the conical-entry-multilayer target are investigated. The results are compared with those in the multilayer target without a cone structure. It is demonstrated that hot electrons in the conical-entry-multilayer target are more numerous, more energetic, and more spatially concentrated than those in the multilayer target, the energy of hot electrons with divergence angle between - 38 degrees and 38 degrees increases by -0.6 times, and the collimation and transport efficiency of hot electrons can be improved using the conical-entry-multilayer target. The main reasons for the enhancement of the collimation and transport efficiency of hot electrons in the conical-entry-multilayer target are as follows: first, the laser pulls a large number of hot electrons out of the cone wall; second, the focusing effect of the cone wall on the laser enhances its ponderomotive force; and third, a stronger self-generated magnetic field distribution is generated behind the cone tip.
Keyword ：
hot electron transport hot electron transport conical-entry-multilayer target conical-entry-multilayer target intense laser intense laser
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| GB/T 7714 | Zhao Quanping , Song Haiying , Wang Yang et al. Hot Electron Transport Characteristics in a Conical-Entry-Multilayer Target Driven by Intense Laser [J]. | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG , 2021 , 48 (24) . |
| MLA | Zhao Quanping et al. "Hot Electron Transport Characteristics in a Conical-Entry-Multilayer Target Driven by Intense Laser" . | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG 48 . 24 (2021) . |
| APA | Zhao Quanping , Song Haiying , Wang Yang , Liu Xun , Li Wei , Liu Shibing . Hot Electron Transport Characteristics in a Conical-Entry-Multilayer Target Driven by Intense Laser . | CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG , 2021 , 48 (24) . |
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