KEIO RESEARCHERS INFORMATION SYSTEM

Profile Summary 【 Display / hide 】

Profile Summary 【 Display / hide 】

• To create new products with high added value, we are conducting R&D on high-accuracy, high-efficiency, resource-saving manufacturing technologies through micro/nanometer-scale material removal, deformation, and property control. Our recent research focuses on ultra-precision mechanical fabrication, micro-nano forming/imprinting, micro electrical machining, laser machining, laser recovery, and laser Raman spectroscopy.

Career 【 Display / hide 】

Career 【 Display / hide 】

• 2000.04

  -

  2001.09

  Research Associate, Tohoku University, Graduate School of Engineering

• 2001.10

  -

  2005.03

  Associate Professor, Kitami Institute of Technology

• 2005.04

  -

  2007.03

  Associate Professor, Tohoku University, Graduate School of Engineering

• 2007.04

  -

  2012.03

  Associate Professor, Tohoku University, Graduate School of Engineering

• 2008.02

  -

  2008.04

  Sydney University, Japan-Australia Exchange Researcher

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Academic Background 【 Display / hide 】

Academic Background 【 Display / hide 】

• 1991.07

  Jilin University, Faculty of Engineering, Department of Mechanical Engineering

  University, Graduated

• 1994.03

  Jilin University, Graduate School, Division of Engineering, Department of Mechanical Engineering

  Graduate School, Completed, Master's course

• 1996.01

  Tsinghua University, Graduate School, Division of Engineering, Department of Precision Instruments and Mechanology

  Graduate School, Withdrawal before completion, Doctoral course

• 2000.03

  Tohoku University, Graduate School, Division of Engineering, Department of Mechatronics and Precision Engineering

  Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide 】

Academic Degrees 【 Display / hide 】

• Ph.D., Tohoku University, Coursework, 2000.03

Research Areas 【 Display / hide 】

Research Areas 【 Display / hide 】

• Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering (Precision Engineering/Mechanical manufacturing)

• Nanotechnology/Materials / Material processing and microstructure control (Material Processing/Treatment)

• Nanotechnology/Materials / Nano/micro-systems (Micro/Nanodevice)

• Nanotechnology/Materials / Composite materials and interfaces (Applied Physical Properties/Crystal Engineering)

Research Keywords 【 Display / hide 】

Research Keywords 【 Display / hide 】

• Ultraprecision machining

• Micro/nano manufacturing

• Laser processing

• Electrical discharge machining

• Nanomechanics

Books 【 Display / hide 】

Books 【 Display / hide 】

• Ultra-precision grooving technologies

  Huang W., Yan J., Comprehensive Materials Processing: Volume 1-13, Second edition, 2024.01

  　View Summary

  Fabricating microgrooves on part surfaces is a way to provide advanced functionality of the parts, which has recently increased in several fields, such as biotechnology, optics, and aerospace. Considerable progress has been achieved in groove-cutting technology with the equipment development, process optimization and mechanisms understanding. This chapter reviews the ultraprecision cutting technologies for manufacturing of microgrooves and microgroove-based microstructures on various materials. Major cutting methods and their principles/mechanisms for microgrooving have been introduced. The main challenges in the cutting of microgrooves on ductile materials and brittle materials, respectively, are pointed out. Some innovations in groove-cutting technology are also highlighted. Several aspects in demand for further research and development are provided.

  • Access to Document (DOI)

• Advanced Ceramic Coatings: Fundamentals, Manufacturing, and Classification, R. K. Gupta, A. Motallebzadeh, S. Kakooei, T. A. Nguyen, A. Behera (eds.)

  P. J. Liew, J. Yan, C. Y. Yap, Elsevier B. V., 2023.06

  Scope: Chapter 19: Electrical discharge coating with quarry dust powder suspension,  Contact page： 433-460

• Multidisciplinary Science in Micro/Nanoscale Manufacturing

  J. Yan (Guest editor), Elsevier B.V., 2020.12

  Scope: International Journal of Machine Tools and Manufacture, Volume 159 (Special Issue)

• Micro and Nanoscale Laser Processing of Hard Brittle Materials

  J. Yan and N. Takayama, Elsevier B.V., 2019.11,  Page： 242

  Scope: 1-242

• Recent Developments of Silicon Anodes for Lithium Ion Batteries

  J. Yan, CMC Publishing CO., LTD. , 2019.11,  Page： 251

  Scope: Chapter 3: Micro Pillar Generation by Laser Irradiation on Waste Silicon Powder and Its Electrode Characteristics, 20-33

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Papers 【 Display / hide 】

Papers 【 Display / hide 】

• Micromachining of Carbon Fiber Reinforced Plastics Using Femtosecond Pulsed Laser

  Konishi, Y; Yan, JW

  NANOMANUFACTURING AND METROLOGY 8 ( 1 )  2025.12

  ISSN  2520-811X

  　View Summary

  Microscale grooves and holes were fabricated in carbon fiber reinforced plastics (CFRPs) using femtosecond pulsed laser irradiation, and the characteristics and mechanisms of laser processing were investigated. The relationship between laser fluence and ablation depth was established by measuring the cross-sectional profiles of the microgrooves produced at different laser fluences. Furthermore, the effect of the angle between the edge of the micro holes and the carbon fibers was examined by analyzing the edges and wall surfaces of circular and rectangular holes. Experimental results revealed that the laser processing mechanism was strongly dependent on fiber orientation due to significant heat conduction along carbon fibers. The findings of this study contribute to a deeper understanding of the ultrashort pulsed laser processing characteristics and mechanisms for creating small holes in CFRPs and emphasize the possibility of drilling high-precision holes that can be used in the direct bonding of sensors/IC chips to CFRPs.

  • Access to Document (DOI)

• Amorphization of pure aluminium in ultraprecision cutting process: experimental observation and theoretical analysis

  He C., Wang S., Yan J.

  CIRP Journal of Manufacturing Science and Technology 60   76 - 87 2025.09

  ISSN  17555817

  　View Summary

  Preparing amorphous pure metals has long been significantly challenging because of their stringent transformation requirements. Here, we report a surprising discovery: the preparation of a layer of amorphous aluminium by ultraprecision cutting a polycrystalline bulk material. The findings indicated that under specific cutting conditions, polycrystalline aluminium was transformed into a completely amorphous phase on the surface layer. Additionally, the material matrix exhibited shear bands, including an amorphous phase, a 9 R phase, and high-density SFs. The modification resulted in a significant increase in surface micro-hardness, with the average value increasing from 0.93 ± 0.13 GPa to 2.21 ± 0.92 GPa. The amorphization in the ultraprecision cutting process is attributed to the high shear strain and strain rate, as confirmed by molecular dynamics simulation and theoretical calculation. This study provides a novel approach for preparing an amorphous layer on a crystalline aluminium bulk material to enhance its surface properties.

  • Access to Document (DOI)

• Micro-convex structure-assisted laser-induced backside dry etching for high-efficiency fabrication of micro-groove array on fused silica toward manipulation of wetting characteristics

  Huang H., An H., Qian Y., Zhang Z., Jiang M., Yan J.

  Journal of Manufacturing Processes 145   236 - 251 2025.07

  ISSN  15266125

  　View Summary

  Fused silica has garnered significant attention in various industrial applications. The creation of surface micro/nanostructures on fused silica can impart specialized functional properties, such as extreme wettability, ultra-high transmittance, and excellent antimicrobial characteristics. Nonetheless, existing technologies for achieving surface micro/nanopatterning of fused silica, including wire electrical discharge machining, chemical etching, and electrochemical deposition, generally suffer from long processing cycles and high energy consumption, which are inconsistent with the development concept of the low-carbon economy. In this study, a novel approach termed micro-convex structure-assisted laser-induced backside dry etching (MCSALIBDE) is proposed for high-efficiency fabrication of micro-groove array on fused silica surfaces. The synergistic effect of enhanced heat conduction and plasma explosion in a confined space facilitates material ablation. The impact of processing parameters including scanning pitch and peak laser power intensity on the morphological and topographical features of the MCSALIBDE-processed fused silica surfaces is studied. Notably, the micro-groove structures with a depth-to-width ratio of 1.19 is fabricated. Furthermore, the wetting behaviors of the MCSALIBDE-processed fused silica surfaces before and after annealing treatment are studied. Experimental findings reveal that the MCSALIBDE-processed fused silica surfaces exhibit enhanced hydrophilicity compared to the untreated one. After annealing treatment, a transformation from hydrophilicity to superhydrophobicity is observed. The superhydrophobic surfaces produced under different laser parameters exhibit distinct adhesion and droplet bouncing behaviors. This work offers an in-depth understanding of the high-efficiency fabrication of micro/nanostructures on fused silica surfaces and as well the modulation of their wetting characteristics, heralding innovations in surface engineering for diverse applications.

  • Access to Document (DOI)

• Micro-amplitude vibration-assisted scratching: a new method for one step and controllable fabrication of the microscale V-groove and nanoscale ripples

  Wu H., Huang H., Zhang Z., Yan J.

  International Journal of Extreme Manufacturing 7 ( 3 )  2025.06

  ISSN  26318644

  　View Summary

  Highlights A micro-amplitude vibration-assisted scratching method was proposed. One step and controllable fabrication of microscale V-groove and nanoscale ripples was achieved. The effects of processing parameters on the resultant structures were explored. Relationships between processing parameters and dimensions of the resultant structures were established. Complex patterns were fabricated on flat and curved surfaces, achieving various structural colors.

  • Access to Document (DOI)

• Unveiling the effects of laser scanning direction and processing parameters on heat transfer and ablation behavior of CFRP

  An H., Qian Y., Jiang M., Huang H., Yan J.

  Composites Part B: Engineering 298 2025.06

  ISSN  13598368

  　View Summary

  Carbon fiber reinforced plastic (CFRP) has found extensive applications in aerospace, automotive, and biomedical fields owing to its exceptional mechanical properties. Nanosecond pulsed laser processing offers a promising avenue for treating CFRP laminates; however, the inevitable thermal damage during processing may significantly degrade the surface integrity. An in-depth analysis of the correlation between ablation characteristics of CFRP and laser processing conditions is essential for understanding the complex heat transfer and ablation mechanisms during laser processing of CFRP and is a prerequisite for improved control of thermal damage. This study examines the thermal transfer and ablation behavior of CFRP subjected to nanosecond laser ablation, focusing on how laser scanning direction and processing parameters influence the surface characteristics of the laser-ablated regions. The results indicate that the width of the heat-affected zone (HAZ) increases with increasing laser power, decreasing scanning speed, and decreasing scanning pitch. Moreover, the scanning direction plays a crucial role in determining the HAZ characteristics and material removal rate. Processing CFRP along the 0° direction relative to the carbon fiber orientation yields higher efficiency and less thermal damage compared to the 90° direction. Chemical composition analysis reveals that laser ablation induces a structural transformation in carbon fibers, shifting from sp2 graphite-like lattice orbitals to sp3 hybird orbitals. Numerical simulations further elucidate the heat transfer and ablation mechanisms under various experimental conditions. This study contributes to a deeper understanding of the laser-CFRP interaction, facilitating the development of high-integrity CFRP surfaces and broadening their practical applications across multiple industries.

  • Access to Document (DOI)

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Papers, etc., Registered in KOARA 【 Display / hide 】

Papers, etc., Registered in KOARA 【 Display / hide 】

• Laser generation of Si@C core-shell nanowires and its application to the fabrication of next-generation Li-ion battery

  Yan, Jiwang

  科学研究費補助金研究成果報告書 2022

Reviews, Commentaries, etc. 【 Display / hide 】

Reviews, Commentaries, etc. 【 Display / hide 】

• Laser-based micro/nano machining technologies for high-value added manufacturing

  J. Yan

  Machines and Tools 14 ( 11 ) 8 - 15 2024.11

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author

• Creating functional surfaces by micro/nano scale laser machining

  J. Yan

  Laser (Journal of the Japan Society of Laser Technology) 49 ( 1 ) 20 - 25 2024.11

  Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work

• Laser polishing technologies for additive-manufactured metal products

  J. Yan

  Journal of the Japan Society for Abrasive Technology 67 ( 8 ) 440 - 443 2023.08

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author

• Ultraprecision ductile mode machining of hard brittle materials

  J. Yan

  Journal of the Japan Society of Mechanical Engineers 125 ( 1247 ) 11 - 14 2022.10

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author

• Ultrasonic vibration-assisted grinding of carbon-based difficult-to-cut materials

  J. Yan

  Journal of the Japan Society for Precision Engineering 88 ( 7 ) 541 - 545 2022.07

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author

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Presentations 【 Display / hide 】

Presentations 【 Display / hide 】

• Scale-bridging surface structuring for functional performance improvement of components

  J. Yan

  7th CIRP CSI Conference on Surface Integrity 2024 (ブレーメン) , 

  2024.05

  , 

  Oral presentation (keynote)

• Tool Dynamics-induced Surface Topography Error in Fast Tool Servo-Based Diamond Turning of Micro Dome Arrays

  T. Hashimoto, J. Yan

  7th CIRP CSI Conference on Surface Integrity 2024 (Bremen) , 

  2024.05

  , 

  Oral presentation (general)

• Influences of tool tip geometry on surface/subsurface damage formation in nanoscratching of single-crystal 4H-SiC

  W. Huang, J. Yan

  7th CIRP CSI Conference on Surface Integrity 2024 (Bremen) , 

  2024.05

  , 

  Oral presentation (general)

• Ultraprecision manufacturing for small optics

  J. Yan

  Nanotechnology and Precision Engineering (NPE) International Series Forum (Online) , 

  2024.04

  , 

  Oral presentation (invited, special)

• 自由曲面加工における工具姿勢に起因する切削メカニズム変化

  川上凜太朗，閻 紀旺

  精密工学会第31回学生会員卒業研究発表講演会 (東京) , 

  2024.03

  , 

  Oral presentation (general)

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Awards 【 Display / hide 】

Awards 【 Display / hide 】

• JSME Medal for Outstanding Paper

  L. Zhang, Y. Sato, J. Yan, 2024.04, The Japan Society of Mechanical Engineers, Optimization of fast tool servo diamond turning for enhancing geometrical accuracy and surface quality of freeform optics

  Type of Award： Award from Japanese society, conference, symposium, etc.

• IJEM Best Editor Award

  J. Yan, 2024.01, International Journal of Extreme Manufacturing (IJEM), IoP publishing

  Type of Award： Honored in official journal of a scientific society, scientific journal

• JSPE Best Paper Award

  Lin Zhang, Allen Yi, J. Yan, 2023.03, The Japan Society for Precision Engineering, Flexible fabrication of Fresnel micro-lens array by off-spindle-axis diamond turning and precision glass molding

  Type of Award： Award from Japanese society, conference, symposium, etc.

• 2022 IJEM Best Paper Award

  Y. Sato, J. Yan, 2023.03, International Journal of Extreme Manufacturing (IJEM), IoP publishing, Tool path generation and optimization for freeform surface diamond turning based on an independently controlled fast tool servo

  Type of Award： Honored in official journal of a scientific society, scientific journal

• Machine Tool Technology Promotion Award

  S. Kasai, T. Sodetai, J. Yan, 2021.06, 工作機械技術振興財団, 炭素拡散反応を用いた形彫り放電加工による多結晶ダイヤモンドの３次元形状創製

  Type of Award： Award from publisher, newspaper, foundation, etc.

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Courses Taught 【 Display / hide 】

Courses Taught 【 Display / hide 】

• ULTRAPRECISION MACHINING AND METROLOGY

  2025

• SPECIAL LECTURE SERIES ON MULTIDISCIPLINARY AND DESIGN SCIENCE

  2025

• LABORATORIES IN SCIENCE AND TECHNOLOGY

  2025

• INDEPENDENT STUDY ON INTEGRATED DESIGN ENGINEERING

  2025

• INDEPENDENT STUDIES IN MECHANICAL ENGINEERING

  2025

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Memberships in Academic Societies 【 Display / hide 】

Memberships in Academic Societies 【 Display / hide 】

• The Japan Society of Mechanical Engineers, 

  1997.04

  -

  Present

• The Japan Society for Precision Engineering, 

  1997.04

  -

  Present

• The Japan Society for Abrasive Technology, 

  2000.04

  -

  Present

• Japan Society for Applied Physics (JSAP), 

  2004.04

  -

  Present

• Japan Laser Processing Society (JLPS), 

  2009.01

  -

  Present

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Committee Experiences 【 Display / hide 】

Committee Experiences 【 Display / hide 】

• 2024.01

  -

  Present

  Associate Editor, Journal of Materials Processing Technology

• 2022.05

  -

  Present

  Director, Japan Society of Laser Technology (JSLT)

• 2022.03

  -

  Present

  Director, Executive Director, Chairman of Publication Sector, Chairman of Journal Review Board, Japan Society of Precision Engineering (JSPE)

• 2019.04

  -

  2022.03

  Journal Editorial Commitee Member, 日本機械学会

• 2019.01

  -

  Present

  Editorial Board Member, International Journal of Extreme Manufacturing

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