精密に制御したフェトム秒レーザーを半導体材料であるシリコン表面に集光照射したときにのみ特殊な微細構造が形成されることを発見。It was discovered that a special microstructure is formed only when a precisely controlled femtosecond laser is focused on the silicon surface (semiconductor)
https://www.tuat.ac.jp/documents/tuat/admission/nyushi_gakubu/digital_pamphlet/2022_TUAT_Guide_HP.pdf