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Nano Research 2024年第8期17卷 7242-7249页

作者： Guangzhi He Jianfeng Yan Jiawang Xie Ming Qiao Ma Luo Yuzhi Zhao Haoze Han State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Surfaces with micro-nanoscale structures show different optical responses,including infrared reflection,thermal radiation,and protective *** realization of structure camouflage is important for material ***,external cloaks or coatings are necessary in structure camouflage,which limits the surface ***,we propose a novel strategy for the direct structure camouflage through topography inherited removal(TIR)with ultrafast laser,featuring pristine topography preservation and scattering surface *** multistep TIR,pristine topographies are partially and uniformly removed to preserve the original designed *** response changes show the suppression of specular reflection by uniformizing reflected light intensity to a low level on the inherited *** produce various structure camouflages on large scaled substrates,and demonstrate applications of information encryption in code extraction and word recognition through structure *** proposed strategy opens opportunities for infrared camouflage and other technologies,such as thermal management,device security,and information encryption.

关键词： topography inherited removal ultrafast laser structure camouflage optical response information encryption

ultrafast laser-chemical modification hybrid fabrication of hydrostatic bearings with a superhydrophobicity solid-liquid interface

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Science China(Technological Sciences) 2024年第3期67卷 696-708页

作者： GUO MingHui RONG YouMin HUANG Yu FENG XiaoLin HU HaiDong WU CongYi ZHANG GuoJun State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Faculty of Engineering and Life Sciences Universiti Selangor Bestari JayaSelangor 45600Malaysia

Oil film vortex severely reduces the stability of hydrostatic bearings. A solid-liquid interface with drag and slip properties can weaken the oil film vortex of the bearing. Here, a combined picosecond laser ablation and chemical modification method is proposed to prepare surfaces with microbulge array structure on 6061 aluminum alloy substrates. Because of the low surface energy of the perfluorododecyltriethoxysilane modification and the bulge geometry of the microbulge array structure, the surface shows excellent superhydrophobicity. The optimum contact angle in air for water is 164°, and that for oil is 139°. Two surfaces with “lotus-leaf effect” and “rose-petal effect” were obtained by controlling the processing parameters. The drag reduction properties of superhydrophobic surfaces were systematically investigated with slip lengths of 22.26 and 36.25 μm for deionized water and VG5 lubricant, respectively. In addition, the superhydrophobic surface exhibits excellent mechanical durability and thermal stability. The proposed method provides a new idea for vortex suppression in hydrostatic bearings and improves the stability of bearings in high-speed operation.

关键词： superhydrophobicity surface ultrafast laser drag reduction solid-liquid interface microbulge array structure

A review of ultrafast laser micro/nano fabrication:Material processing,surface/interface controlling,and devices fabrication

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Nano Research 2024年第7期17卷 6212-6230页

作者： Heng Guo Jiawang Xie Guangzhi He Dezhi Zhu Ming Qiao Jianfeng Yan Jiachen Yu Jiaqun Li Yuzhi Zhao Ma Luo Haoze Han State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

ultrafast laser processing technology has offered a wide range of opportunities in micro/nano fabrication and other fields such as nanotechnology,biotechnology,energy science,and photonics due to its controllable processing precision,diverse processing capabilities,and broad material *** processing abilities and applications of the ultrafast laser still need more *** the field of material processing,controlling the atomic scale structure in nanomaterials is *** effects exist in ultrafast laser surface/interface processing,making it difficult to modulate the nanostructure and properties of the surface/interface as *** the ultrafast laser fabrication of micro functional devices,the processing ability needs to be ***,we review the research progress of ultrafast laser micro/nano fabrication in the areas of material processing,surface/interface controlling,and micro functional devices *** useful ultrafast laser processing methods and applications in these areas are *** various processing effects and abilities,the ultrafast laser processing technology has demonstrated application values in multiple fields from science to industry.

关键词： ultrafast laser micro/nano fabrication material processing surface/interface controlling devices fabrication

ultrafast laser processing of silk films by bulging and ablation for optical functional devices

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Light(Advanced Manufacturing) 2024年第3期5卷 28-38页

作者： Ming Qiao Huimin Wang Heng Guo Ma Luo Yuzhi Zhao Haoze Han Jianfeng Yan Yingying Zhang State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China

Organic proteins are attractive owing to their unique optical properties,remarkable mechanical characteristics,and *** multifunctional structures on organic protein films is essential for practical applications;however,the controllable fabrication of specific structures remains ***,we propose a strategy for creating specific structures on silk film surfaces by modulating the bulging and ablation of organic *** surface morphologies such as bulges and craters with continuously varying diameters were generated based on the controlled ultrafast laser-induced crystal-form transition and plasma ablation of the silk *** to the anisotropic optical properties of the bulge/crater structures with different periods,the fabricated organic films can be used for large-scale inkless color *** simultaneously engineering bulge/crater structures,we designed and demonstrated organic film-based optical functional devices that achieves holographic imaging and optical *** study provides a promising strategy for the fabrication of multifunctional micro/nanostructures that can broaden the potential applications of organic materials.

关键词： ultrafast laser Protein Bulging Ablation Optical functional devices

ultrafast laser-induced self-organized nanostructuring in transparent dielectrics:fundamentals and applications

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PhotoniX 2023年第1期4卷 245-276页

作者： Bo Zhang Zhuo Wang Dezhi Tan Jiangrong Qiu State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhouChina Zhejiang Lab HangzhouChina

Inscribing functional micro-nano-structures in transparent dielectrics enables constructing all-inorganic photonic devices with excellent integration,robustness,and durability,but remains a great challenge for conventional fabrication ***,ultrafast laser-induced self-organization engineering has emerged as a promising rapid prototyping platform that opens up facile and universal approaches for constructing various advanced nanophotonic elements and attracted tremendous attention all over the *** paper summarizes the history and important milestones in the development of ultrafast laser-induced self-organized nanostructuring(ULSN)in transparent dielectrics and reviews recent research progresses by introducing newly reported physical phenomena,theoretical mechanisms/models,regulation techniques,and engineering applications,where representative works related to next-generation light manipulation,data storage,optical detecting are discussed in *** paper also presents an outlook on the challenges and future trends of ULSN,and important issues merit further exploration.

关键词： ultrafast laser Self-organization Nanostructuring Transparent dielectrics

Micro/nano processing of natural silk fibers with near-field enhanced ultrafast laser

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Science China Materials 2020年第7期63卷 1300-1309,M0003页

作者： Ming Qiao Huimin Wang Haojie Lu Shuo Li Jianfeng Yan Liangti Qu Yingying Zhang Lan Jiang Yongfeng Lu Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China laser Micro/Nano Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Electrical and Computer Engineering University of Nebraska-LincolnLincolnNE 68588-0511USA

Silkworm silk fiber is an attractive material owing to its remarkable mechanical characteristics,excellent optical properties,and good biocompatibility and ***,nano-processing of the silk fiber is still a challenge limiting its applications in nanoengineering and related ***,we report localized near-field enhancement-assisted ablation with an ultrafast laser to break this *** processing of silk fiber,including nano-holing,nano-grooving,and cutting could retain the key molecular structure building blocks and the pristine functionality of the silk *** extremely narrow nanohole with a width of^64 nm was successfully *** processed silk fiber can be used to transfer micro/nanoparticles and drugs,showing potential for biomedical *** processing strategy developed in this study can also be extended to other materials,paving a new way for fabricating functional nanostructures with precisely controlled size and morphology.

关键词： ultrafast laser silk fiber laser ablation nano-processing drug delivery

Slicing of large-size single crystals by ultrafast laser with external stress assistance

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Chinese Optics Letters 2024年第8期22卷 100-105页

作者： Lifeng Wang Lili Liu Yinan Wang Xun Li Chenchen Li Ming Li State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China

The existing single-crystal slicing techniques result in significant material wastage and elevate the production cost o premium-quality thin slices of *** we report(for the first time,to our knowledge)an approach for vertical slicin of large-size single-crystal gain materials by ultrafast *** employing aberration correction techniques,the optimi zation of the optical field distribution within the high-refractive-index crystal enables the achievement of a continuou laser-modified layer with a thickness of less than 10μm,oriented perpendicular to the direction of the laser direction The compressed focal spot facilitates crack initiation,enabling propagation under external forces,ultimately achievin the successful slicing of aΦ12 mm *** surface roughness of the sliced Yb:YAG is less than 2.5μ*** result illustrate the potential of low-loss slicing strategy for single-crystal fabrication and pave the way for the future develop ment of thin disk lasers.

关键词： single-crystal gain materials ultrafast laser slicing YAG aberration correction

ultrafast-laser-treated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)electrodes with enhanced conductivity and transparency for semitransparent perovskite solar cells

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Frontiers of Chemical Science and Engineering 2023年第2期17卷 206-216页

作者： Yongshun Wang Yuxi Dou Zhengzhe Wu Yingxin Tian Yiming Xiong Juan Zhao De Fang Fuzhi Huang Yi-Bing Cheng Jie Zhong State Key Laboratory of Advanced Technology of Materials Composite Technology Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216China School of Automobile Engineering Wuhan University of TechnologyWuhan 430070China Center for Materials Research and Analysis Wuhan University of TechnologyWuhan 430070China

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)is an important organic electrode for solution-processed low-cost electronic ***,it requires doping and post-solvent treatment to improve its conductivity,and the chemicals used for such treatments may affect the device fabrication *** this study,we developed a novel route for exploiting ultrafast lasers(femtosecond and picosecond laser)to simultaneously enhance the conductivity and transparency of PEDOT:PSS films and fabricate patterned solution-processed electrodes for electronic *** conductivity of the PEDOT:PSS film was improved by three orders of magnitude(from 3.1 to 1024 S·cm^(–1)),and high transparency of up to 88.5%(average visible transmittance,AVT)was *** and depthprofiling X-ray photoelectron spectroscopy revealed that the oxidation level of PEDOT was enhanced,thereby increasing the carrier *** surface PSS content also decreased,which is beneficial to the carrier mobility,resulting in significantly enhanced electrical ***,we fabricated semitransparent perovskite solar cells using the as-made PEDOT:PSS as the transparent top electrodes,and a power conversion efficiency of 7.39%was achieved with 22.63%***,the proposed route for synthesizing conductive and transparent electrodes is promising for vacuum and doping-free electronics.

关键词： PEDOT:PSS ultrafast laser transparent electrode ST-PSCs patterning

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Ultra-long-period grating-based multi-wavelength ultrafast fiber laser [Invited]

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Chinese Optics Letters 2021年第7期19卷 48-55页

作者： Bo Guo Xinyu Guo Lige Tang Wenlei Yang Qiumei Chen Zhongyao Ren Key Laboratory of In-fiber Integrated Optics Ministry of EducationHarbin Engineering UniversityHarbin 150001China

We propose and demonstrate the cascaded multi-wavelength mode-locked erbium-doped fiber laser(EDFL) based on ultralong-period gratings(ULPGs) for the first time, to the best of our *** found that the ULPG can be used as both a mode-locker for pulse shaping and a comb filter for multi-wavelength generation *** the dual-function of ULPG, three-, four-, five-, six-, and seven-wavelength mode-locked pulses are obtained in EDFL, seven of which are the largest number of wavelengths up to *** the four-wavelength soliton pulses, their pulse width is about 7.8 *** maximum average output power and slope efficiency of these pulses are 8.4 m W and 2.03%, *** the conventional pulses, hybrid soliton pulses composed of a four-wavelength pulse and single soliton are also ***, the effect of cavity dispersion on the multi-wavelength mode-locked pulses is also *** findings indicate that apart from common sensing and filtering, the ULPG may also possess attractive nonlinear pulse-shaping property for ultrafast photonics application.

关键词： ultra-long-period grating fiber laser ultrafast laser multi-wavelength

ultrafast lasers—reliable tools for advanced materials processing

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Light(Science & Applications) 2014年第1期3卷 256-267页

作者： Koji Sugioka Ya Cheng RIKEN Center for Advanced Photonics SaitamaJapan State Key Laboratory of High Field laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina

The unique characteristics of ultrafast lasers,such as picosecond and femtosecond lasers,have opened up new avenues in materials processing that employ ultrashort pulse widths and extremely high peak ***,ultrafast lasers are currently used widely for both fundamental research and practical *** review describes the characteristics of ultrafast laser processing and the recent advancements and applications of both surface and volume *** processing includes micromachining,microand nanostructuring,and nanoablation,while volume processing includes two-photon polymerization and three-dimensional(3D)processing within transparent *** and industrial applications of ultrafast laser processing are also introduced,and a summary of the technology with future outlooks are also given.

关键词： 3D fabrication industrial application micromachining nanofabrication ultrafast laser