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| 1 | Iterative freeform lens design for optical field control显示文摘It is still very challenging to determine a freeform lens for converting a given input beam into a prescribed output beam where not only the irradiance distribution but also the phase distribution hardly can be expressed analytically.Difficulties arise because the ray mapping from the input beam to the output beam is not only intertwined with the required double freeform surfaces but also intertwined with the output phase distribution,whose gradient represents the directions of the output rays.Direct determination of such a problem is very difficult.Here,we develop a special iterative wavefront tailoring(IWT)method to tackle this problem.In a certain iteration,the current calculation data of the double freeform surfaces and the output phase gradient are used to update the coefficients of a Monge–Ampère equation describing an intermediate wavefront next to the entrance freeform surface.The solution to the wavefront equation could lead to an improved ray mapping to be used to update the corresponding phase gradient data and reconstruct the double freeform surfaces.In a demonstrative example that deviates much from the paraxial or small-angle approximation,the new IWT method can generate a freeform lens that performs much better than that designed by a conventional ray mapping method for producing two irradiance distributions in the forms of numerals'1'and'2'on two successive targets,respectively. | ZEXIN FENG DEWEN CHENG YONGTIAN WANG | 2021 | Photonics Research2021，9，9： | 7 |
| 2 | Iterative freeform lens design for prescribed irradiance on curved target显示文摘Current freeform illumination optical designs are mostly focused on producing prescribed irradiance distributions on planar targets.Here,we aim to design freeform optics that could generate a desired illumination on a curved target from a point source,which is still a challenge.We reduce the difficulties that arise from the curved target by involving its varying z-coordinates in the iterative wavefront tailoring(IWT)procedure.The new IWT-based method is developed under the stereographic coordinate system with a special mesh transformation of the source domain,which is suitable for light sources with light emissions in semi space such as LED sources.The first example demonstrates that a rectangular flat-top illumination can be generated on an undulating surface by a spherical-freeform lens for a Lambertian source.The second example shows that our method is also applicable for producing a non-uniform irradiance distribution in a circular region of the undulating surface. | Zexin Feng Dewen Cheng Yongtian Wang | 2020 | Opto-Electronic Advances2020，3，7： | 2 |
| 3 | Design of compact and smooth free-form optical system with uniform illuminance for LED source显示文摘 | Luo Yi Feng Zexin Han Yanjun | 2010 | Optics Express2010，18，9： | 1 |
| 4 | Design of LED freeform optical system for road lighting with high luminance ratio显示文摘 | Zexin Feng Yi Luo Yanjun Han | 2010 | Opt Express2010，18，22： | 1 |
| 5 | Design of compact and smooth free -form optical system with uniform illuminance for LED source显示文摘 | Luo Yi Feng Zexin Han Yanjun | 2010 | Optics Express2010，18，9： | 1 |
| 6 | Design m compact and smooth free-for optical design uniform illuminance for LED source 显示文摘 | Yi Luo Zexin Feng Yanjun Han | 2010 | Optics Express2010，18，9： | 1 |
| 7 | Design of LED freeform optical systerm for toad lighting with high luminance/ illuminance radio 显示文摘 | Zexin Feng Yi Luo Yanjun Han | 2010 | Opt Express2010，18，22： | 1 |
| 8 | Dodecyl Mercaptan Functionalized Copper Mesh for Water Repellence and Oil-water Separation显示文摘Reckless discharge of industrial wastewater and domestic sewage as well as frequent leakage of crude oil have caused serious environmental problems and posed severe threat to human survival.Various nature inspired superhy-drophobic surfaces have been successfully applied in oily water remediation.However,further improvements are still urgently needed for practical application in terms of facile synthesis process and long-term durability towards harsh environment.Herein,we propose a simple one-step dodecyl mercaptan functionalization method to fabricate Super-hydrophobic-Superoleophilic Copper Mesh(SSCM).The prepared SSCM possesses excellent water repellence and oil affinity,enabling it to successfully separate various oil-water mixtures with high separation efficiency(e.g.,>99%for hexadecane-water mixture).The SSCM retains high separating ability when hot water and strong corrosive aqueous solutions are used to simulate oil-water mixtures,indicating remarkable chemical durability of the dodecyl mercaptan functionalized copper mesh.Additionally,the efficiency can be well maintained during 50 cycles of separation,and the water repellence is even stable after storage in air for 120 days,demonstrating the reusability and long-term stability of the SSCM.Furthermore,the functionalized mesh also shows good mechanical robustness towards abrasion by sandpaper,and oil-water separation efficiency of>96%can be obtained after 10 cycles of abrasion.The reported one-step dodecyl mercaptan functionalization could be a simple method for increasing the water repellence of copper mesh,and thereby be a great candidate for treating large-scale oily wastewater in harsh environments. | Yanling Tian Jiekai Feng Zexin Cai Jiaqi Chao Dawei Zhang Yuxiao Cui Faze Chen | 2021 | Journal of Bionic Engineering2021，18，4： | 1 |
| 9 | Quantifying Solid Solution Strengthening in Nickel-Based Superalloys via High-Throughput Experiment and Machine Learning显示文摘Solid solution strengthening(SSS)is one of the main contributions to the desired tensile properties of nickel-based superalloys for turbine blades and disks.The value of SSS can be calculated by using Fleischer’s and Labusch’s theories,while the model parameters are incorporated without fitting to experimental data of complex alloys.In thiswork,four diffusionmultiples consisting of multicomponent alloys and pure Niare prepared and characterized.The composition and microhardness of singleγphase regions in samples are used to quantify the SSS.Then,Fleischer’s and Labusch’s theories are examined based on high-throughput experiments,respectively.The fitted solid solution coefficients are obtained based on Labusch’s theory and experimental data,indicating higher accuracy.Furthermore,six machine learning algorithms are established,providing a more accurate prediction compared with traditional physical models and fitted physical models.The results show that the coupling of highthroughput experiments and machine learning has great potential in the field of performance prediction and alloy design. | Zihang Li Zexin Wang Zi Wang Zijun Qin Feng Liu Liming Tan Xiaochao Jin Xueling Fan Lan Huang | 2023 | Computer Modeling in Engineering & Sciences2023，，5： | 0 |
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