Institute of Multidisciplinary Research for Advanced Materials, Tohoku University


LAST UPDATE 2021/05/03

  • 研究者氏名
    Researcher Name

    上杉祐貴 Yuuki UESUGI
    助教 Assistant Professor
  • 所属
    Professional Affiliation

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

    プロセスシステム工学研究部門 光物質科学研究分野
    Division of Process and System Engineering, Laser Applied Material Science
  • 研究キーワード
    Research Keywords

    Ponderomotive lens
    Laser processing of membrane
    Optical enhancement cavity
Research Subject
Research on electron optical devices and laser-processing methods using advanced lasers

研究の背景 Background


Sophisticated laser technology offers many manipulation possibilities for light properties, such as wavelength, intensity, phase (wavefront), polarization, and temporal structure. Lately, a technology substituting electric or magnetic fields with light to create lens elements for electron microscopes has emerged, garnering significant interest. Even in the laser-processing field where numerous applications have been actualized, the machining of nanometer-thick membranes and two-dimensional materials such as graphene remains an unexplored field with limited studies.

研究の目標 Outcome

光と自由電子の2次の相互作用過程を利用する電子レンズとして、ポンデロモーティブレンズを世界に先駆けて提案しました[1,2]。このレンズは電子顕微鏡の球面収差補正に利用できる可能性があり、その実証に向けた研究に取り組んでいます。また、従来のナノ加工技術では取り扱いが困難だったナノ薄膜や単層グラフェンを、サブ100 nmの分解能で加工するレーザー加工技術を開発しました[3,4]。今後、最先端の半導体産業や量子科学・材料研究、生体センサー等への展開を目指していきます。

We proposed the world's first ponderomotive lens as an electron lens that utilizes the second-order interaction process between light and free electrons [1,2]. This lens has the potential for use in spherical aberration correction in electron microscopes. Furthermore, we have demonstrated the laser-processing that enables us to process nanomembranes and monolayer graphene with sub-100 nm resolution [3,4]. Our future aspirations involve broadening the application of this technique across various domains, including the advanced semiconductor industry, quantum and materials science, and advanced bio-sensors.

研究図Research Figure

Fig.1. Conceptual illustration of the light-field electron lens. An electron beam (blue) receives the focusing force from a doughnut-shaped light beam (red) at the waist position of the light beam. The inset shows details of the waist area.

Fig. 2. (a) Schematic of the laser processing system. (b) Formation of 32 laser spots on the graphene film. (c) Image of a graphene film that has been multi-point hole-drilled.

文献 / Publications

[1] Y. Uesugi, Y. Kozawa, and S. Sato, Phys. Rev. Applied 16, L011002 (2021). [2] Y. Uesugi, Y. Kozawa, and S. Sato, J. Opt. 24, 054013 (2022). [3] Y. Uesugi et al., Appl. Phys. A 129, 101 (2023). [4] N. Kadoguchi et al., Nano Lett. (2023) (volume, issue, and pages to be determined).