Department of Mechanical Engineering Faculty of Science and Technology Keio University Hiyoshi 3-14-1 Kohoku Yokohama Kanagawa 223-8522 Japan;
Department of Mechanical Engineering Faculty of Science and Technology Keio University Hiyoshi 3-14-1 Kohoku Yokohama Kanagawa 223-8522 Japan;
Nanodot structure; Surface patterning; Picosecond pulsed laser; LIPSS; Tool steel; Wettability control;