Yan, Jiwang



Faculty of Science and Technology, Department of Mechanical Engineering (Yagami)



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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

  • 2000.04

    Research Associate, Tohoku University, Graduate School of Engineering

  • 2001.10

    Associate Professor, Kitami Institute of Technology

  • 2005.04

    Associate Professor, Tohoku University, Graduate School of Engineering

  • 2007.04

    Associate Professor, Tohoku University, Graduate School of Engineering

  • 2008.02

    Sydney University, Japan-Australia Exchange Researcher

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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

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


Research Areas 【 Display / hide

  • Production engineering/Processing studies (Precision Engineering/Mechanical manufacturing)

  • Material processing/Microstructural control engineering (Material Processing/Treatment)

  • Nano/Microsystems (Micro/Nanodevice)

  • Composite materials/Surface and interface engineering (Applied Physical Properties/Crystal Engineering)

Research Keywords 【 Display / hide

  • Ultraprecision machining

  • Micro/nano manufacturing

  • Laser processing

  • Electrical discharge machining

  • Nanomechanics


Books 【 Display / hide

  • 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

     View Summary

    © Elsevier 2020. All rights reserved. Micro and Nanoscale Laser Processing of Hard Brittle Materials examines general laser-material interactions within this type of material, focusing on the nanoprocessing technologies that these phenomena have given rise to. Sections cover laser machining, healing, recovery, sintering, surface modification, texturing and microstructuring. These technologies all benefit from the characteristics of laser processing, its highly localized heating ability, and its well-defined optical properties. The book also describes frontier applications of the developed technologies, thus further emphasizing the possibility of processing hard brittle materials into complex structures with functional surfaces at both the micro and nanoscale.

  • 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

  • Micro and Nano Fabrication Technology

    J. Yan (ed.), Springer Nature Singapore Pte Ltd., 2018.05

    Scope: 1-959

  • Micro and Nano Fabrication Technology, J. Yan (ed.)

    M. Mukaida, J. Yan, Springer Nature Singapore Pte Ltd., 2018.05

    Scope: Chapter 7: Tool-Servo Driven Diamond Turning for Structured Surface, 215-244

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Papers 【 Display / hide

  • Laser induced micro-cracking of Zr-based metallic glass using 10<sup>11</sup> W/m<sup>2</sup> nano-pulses

    Huang H., Qian Y., Wang C., Yan J.

    Materials Today Communications (Materials Today Communications)  25 2020.12

     View Summary

    © 2020 Elsevier Ltd Low power nanosecond laser irradiation has potential applications in surface processing of metallic glasses (MGs). However, the response of MGs to a relatively low power intensity (1011 W/m2) has not been investigated. In this study, surface microstructures and characteristics of Zr-based MG after low power nanosecond laser irradiation were studied. Micro-cracks with depth in nanoscale and width in microscale were observed on the irradiated MG surface. The effects of laser parameters on the formation and evolution of micro-cracks were further investigated, and surface characteristics were characterized by using X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). The results showed that under the peak laser power intensity of 2.3 × 1011 W/m2, when increasing the scanning speed from 1 to 5 mm/s, the maximum width of micro-cracks reduced from 3 μm to be less than 1 μm; further increasing to 10 mm/s, no micro-cracks appeared. When increasing the laser power intensity, the micro-groove structure would be formed with pileup around it and line cracks, open cracks and laser pulse tracks on it. During multi-line laser scanning, the pulse overlap rate also affected the formation and distribution of micro-cracks. At last, the formation mechanism of micro-cracks was discussed. These results would be meaningful for understanding the laser-MG interaction as well as guiding the selection of laser parameters for various applications.

  • Algorithm of Micro-Grooving and Imaging Processing for the Generation of High-Resolution Structural Color Images

    Zhou T., He Y., Wang T., Dong X., Liu P., Zhao W., Hu Y., Yan J.

    Nanomanufacturing and Metrology (Nanomanufacturing and Metrology)  3 ( 3 ) 187 - 198 2020.09

    ISSN  2520811X

     View Summary

    © 2020, International Society for Nanomanufacturing and Tianjin University and Springer Nature Singapore Pte Ltd. The use of submicron structures for structural coloration of surfaces has broad applications for color filters, projection displays, virtual reality, and anti-counterfeiting. Currently, structural color images lack high resolution due to low manufacturing accuracy. In this study, the axial-feed fly cutting (AFC) method is proposed to fabricate submicron grooves for the diffraction of visible light to create structural color images. We establish the relationship between the color information in the pixels of the original image and the parameters of the array units corresponding to the pixels. An algorithm to determine groove spacing and the tool path is established, and array units with the desired groove spacing are machined to reproduce the structural color images. The submicron grooves fabricated by AFC have high quality and good consistency. Due to the excellent diffraction performance of the machined grooves, images with high saturation and resolution can be reproduced. It is verified that images with various colors can be efficiently fabricated using the proposed method and algorithm.

  • Generation of high-saturation two-level iridescent structures by vibration-assisted fly cutting

    He Y., Zhou T., Dong X., Liu P., Zhao W., Wang X., Hu Y., Yan J.

    Materials and Design (Materials and Design)  193 2020.08

    ISSN  02641275

     View Summary

    © 2020 The Authors The submicron-level structured surface induces viewing-angle-dependent iridescence, and has wide applications in multi-color printing, micro-display projection, invisibility cloak technology. In this study, several types of two-level structures, which consist of the first-order micro geometric features corresponding to the pattern shape and the second-order submicron grooves corresponding to the diffraction grating, are designed to directly induce a variety of iridescent patterns based on their shape regulations. To fabricate these two-level iridescent structures with high accuracy in a single step, vibration-assisted fly cutting (VAFC) is proposed. VAFC involves the low-frequency vibration of the workpiece in the vertical direction during the feed in the horizontal direction and the high-speed rotation of the diamond cutting tool. A 3D theoretical model is established for the numerical simulation of the generating process of the iridescent structures and the regulation of the first-order geometric feature by vibration parameters. As the key parameter to the iridescent color, the spacing of the second-order submicron grooves is flexibly controlled by the feed rate. A VAFC platform is developed to fabricate the two-level structures and an optical detection system is setup to test the surface iridescence. Various vivid colors are regulated by the two-level structures with high saturation and uniformity.

  • Silicon nanoparticle generation and deposition on glass from waste silicon powder by nanosecond pulsed laser irradiation

    Momoki K., Manabe T., Li L., Yan J.

    Materials Science in Semiconductor Processing (Materials Science in Semiconductor Processing)  111 2020.06

    ISSN  13698001

     View Summary

    © 2020 Elsevier Ltd Silicon nanoparticles can be used for fabricating electrodes in high-performance lithium ion batteries and other high value-added products. Currently, silicon nanoparticles are fabricated by pulsed laser irradiation of single-crystal silicon wafers in water. In this study, we proposed silicon nanoparticle generation by using a nanosecond pulsed laser to irradiate waste silicon powder which is disposed from wire-saw slicing processes of silicon ingots. The laser-induced nanoparticles were backward-transferred and deposited on a glass substrate. It was found that the morphology and amount of the deposited nanoparticles was strongly dependent on the distance between the glass substrate and the waste silicon powder target. Raman spectroscopy showed that the silicon nanoparticles were crystalline, and the average size was ~10 nm. The obtained silicon nanoparticles had high purity, as the diamond abrasives included in the waste silicon powder were removed through oxidation and vaporization during laser irradiation.

  • Generating Nanodot Structures on Stainless-Steel Surfaces by Cross Scanning of a Picosecond Pulsed Laser

    Kobayashi T., Yan J.

    Nanomanufacturing and Metrology (Nanomanufacturing and Metrology)  3 ( 2 ) 105 - 111 2020.06

    ISSN  2520811X

     View Summary

    © 2020, The Author(s). Ultrashort pulsed laser-induced periodic surface structures (LIPSS) can be generated on different kinds of materials, which are widely utilized for modifying surface properties such as wettability, adhesion, and tribological, as well as optical performances. Previous studies have focused mainly on one-dimensional LIPSS (i.e., line structure) generation. In this study, a picosecond pulsed laser was used to irradiate stainless-steel surfaces for generating two-dimensional LIPSS, namely nanodot structures, by cross-scanning the laser beam for a different number of times. The obtained nanodot structures were found to be super hydrophilic just after laser irradiation, but turned to be hydrophobic after exposure in air for a few days. By cross-scanning the laser beam for the same number of times, local LIPSS rewriting was realized. This study showed the possibility of improving the homogeneity of the surface properties of steel materials through laser-induced nanodot structuring.

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Reviews, Commentaries, etc. 【 Display / hide

  • Effects of ultrasonic vibration on groove grinding of CFRP

    T. Yamazaki, J. Yan

    Ultrasonic Technology 32 ( 6 ) 1 - 6 2020.12

    Introduction and explanation (commerce magazine), Joint Work

  • Surface quality improvement of additive-manufactured metal parts by ultrasonic vibration-assisted burnishing

    A. Teramachi, J. Yan

    Ultrasonic Technology 32 ( 6 ) 7 - 11 2020.12

    Introduction and explanation (commerce magazine), Joint Work

  • Laser-Induced Periodic Surface Structure on Steel and Its Application to Mold Fabrication

    J. Yan

    Journal of the Japan Society for Abrasive Technology 64 ( 8 ) 399 - 402 2020.08

    Introduction and explanation (scientific journal), Single Work

  • Tool contour measurement technology for ultraprecision cutting of free-form microstructured surfaces

    K. Nagayama, J. Yan

    Machines and Tools 10 ( 3 ) 8 - 12 2020.03

    Introduction and explanation (scientific journal), Joint Work

  • Surface smoothing of additive manufactured alloy by multiple laser processes

    T. Urushibata, H. Ishida, Y. Sugiyama, T. Wakabayashi, Y. Takushima, J. Yan

    Journal of Japan Laser Processing Society 26 ( 2 ) 44 - 46 2019.06

    Introduction and explanation (scientific journal), Joint Work

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Presentations 【 Display / hide

  • 微細構造表面の超精密加工と機能付与

    閻 紀旺

    精密工学会第410回講習会「超精密 加工/計測技術 -光学部品の高精度要求に応える先端事例と最新動向」 (東京(オンライン開催)) , 2020.12, Oral Presentation(guest/special)

  • マイクロ加工技術の進展と研究動向

    閻 紀旺

    精密工学会マイクロ生産機械システム専門委員会2020年度総会兼第59回委員会 (東京(オンライン開催)) , 2020.12, Oral Presentation(guest/special)

  • Laser healing of machining-induced microcracks in single-crystal sapphire

    K. Adachi, Y. Nishide, N. Sugizaki, J. Yan

    The 18thInternational Conference on Precision Engineering (ICPE2020) (Kobe, Japan (Online)) , 2020.11, Oral Presentation(general)

  • Response of resin coating films containing fine metal particles to ultrashort laser pulses

    A. Nakajima, J. Yan

    The International Symposium on Precision Engineering and Sustainable Manufacturing (PRESM2020) (Seoul, Korea (Online)) , 2020.11, Poster (general)

  • Micro/nanoscale surface structuring for functionalization of materials

    J. Yan

    The International Symposium on Precision Engineering and Sustainable Manufacturing (PRESM2020) (Seoul, Korea (Online)) , 2020.11, Oral Presentation(guest/special)

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Research Projects of Competitive Funds, etc. 【 Display / hide

  • Laser irradiation-induced micro pillar generation and its application to the fabrication of next-generation Li-ion battery


    MEXT,JSPS, Grant-in-Aid for Scientific Research, 閻 紀旺, Grant-in-Aid for Challenging Research (Exploratory) , Principal Investigator

  • Ultraprecision forming of hybrid Fresnel lenses using infrared-transparent polymer and single-crystal silicon


    MEXT,JSPS, Grant-in-Aid for Scientific Research, 閻 紀旺, Grant-in-Aid for Scientific Research (B), Principal Investigator

  • Ultra-high temperature nanoindentation by means of laser local heating


    MEXT,JSPS, Grant-in-Aid for Scientific Research, 閻 紀旺, Grant-in-Aid for Challenging Exploratory Research, Principal Investigator

     View Summary

    The investigation of ultra-high temperature mechanical property of power semiconductors and heat-resistance ceramics is an important issue. Currently, the highest temperature used for nanoindentation tests is a few hundred degree. In this study, to realize ultra-high temperature nanoindentation up to 1200 degree, local heating method using a beam of laser was used to heat the samples. It was found that the nano-crystal diamond indenter was able to be used for the nanoindentation of ultra-hard materials like diamond, and by momentary local heating, the thermal deformation of the indentation system was suppressed.

  • Ultraprecision cutting of single-crystal silicon using electrically conductive nano-crystal diamond tools under electromagnetic fields


    MEXT,JSPS, Grant-in-Aid for Scientific Research, 閻 紀旺, Grant-in-Aid for Scientific Research (B), Principal Investigator

     View Summary

    Single-crystal silicon is required as the substrates for complex-shaped infrared lenses which are used widely in car night-vision systems, security systems, and thermography systems. However, when cutting silicon using a single-crystal diamond tool, the tool wear is extremely severe, which causes the degradation of form accuracy and the increase in production cost. In this research, an electrically conductive diamond tool was used to cut silicon under electrical voltage and light irradiation in electromagnetic fields. By inducing a small electrical current between the tool and the workpiece, the back-bond electron flow from diamond was suppressed, and the life of the diamond tool was extended.

Awards 【 Display / hide

  • PRESM2020 Best Paper Award

    A. Nakajima, J. Yan, 2020.10, International Symposium on Precision Engineering and Sustainable Manufacturing (PRESM2020), Response of Resin Coating Films Containing Fine Metal Particles to Ultrashort Laser Pulses

    Type of Award: Awards of International Conference, Council and Symposium.  Country: Korea

  • Outstanding Paper Award

    Z. Zhang, J. Yan, T. Kuriyagawa, 2020.09, International Journal of Extreme Manufacturing (IJEM), IoP publishing, Manufacturing technologies toward extreme precision

    Type of Award: Celebration by Official journal of a scientific society or Academic Journal

  • JSAT Best Paper Award

    Y. Sunaba, N. Tachikawa, Y. Katayama, J. Yan, 2020.02, Japan Society of Abrasive Technology, Fabrication of porous composite by high-pressure sintering of silicon cutting chips and metal particles

    Type of Award: Awards of National Conference, Council and Symposium

  • ASPEN2019 Best Paper Award

    Y. Saito, Y. Sasaki, M. Hirakoka, M. Kubota, J. Yan, 2019.11, The 8th International Conference of ASPEN, Chatter suppression in ultra-precision cutting of thin material substrates

    Type of Award: Awards of International Conference, Council and Symposium

  • Machine Tool Technology Promotion Award

    R. Kishi, J. Yan, 2019.06, 工作機械技術振興財団, 同一電極による放電・電解複合加工の試み

    Type of Award: Awards of Publisher, Newspaper Company and Foundation

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Courses Taught 【 Display / hide











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Memberships in Academic Societies 【 Display / hide

  • The Japan Society of Mechanical Engineers, 

  • The Japan Society for Precision Engineering, 

  • The Japan Society for Abrasive Technology, 

  • Japan Society for Applied Physics (JSAP), 

  • Japan Laser Processing Society (JLPS), 


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Committee Experiences 【 Display / hide

  • 2019.04

    Journal Editorial Commitee Member, 日本機械学会

  • 2019.01

    Editorial Board Member, International Journal of Extreme Manufacturing

  • 2018.04

    Editorial Board Member, Journal of Micromanufacturing

  • 2018.03

    Editorial Board Member, International Journal of Machine Tools and Manufacture

  • 2017.06

    Editorial Board Member, Nanomanufacturing and Metrology

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