宮地研が関連する研究成果が発表されました。
掲載論文情報
掲載誌：Applied Surface Science
出版日：2026年6月22日付（電子版）
論文名：Controllable formation of aperiodic 2D nanostructures on titanium by circularly polarized gigahertz-burst femtosecond laser toward biological growth regulation
著者名：Shota Kawabata, Ashkan Momeni, Shi Bai, Kotaro Obata, Livia Elena Sima, Stefana Orobeti, Kazunari Ozasa, Felix Sima, Godai Miyaji, Koji Sugioka*
DOI ：https://doi.org/10.1016/j.apsusc.2026.167636
概要：Conventional irradiation schemes of femtosecond lasers (single-pulse mode) with linear and circular polarization typically produce laser-induced periodic surface structures (LIPSS) with one-dimensional (1D) striped-patterns and 2D nanodot-arrays, respectively. Additionally, linearly polarized femtosecond lasers operating in gigahertz (GHz) burst mode generate distinct lattice-like 2D LIPSS. However, LIPSS formation by circularly polarized femtosecond laser in GHz burst mode has remained unexplored. In this study, we investigate the formation of surface nanostructures on titanium (Ti) by circularly polarized GHz burst mode femtosecond laser pulses. We demonstrate that this irradiation scheme can create different types of sub-micron aperiodic 2D nanostructures. The morphology can be tuned by the number of intra-pulses within a burst, enabling a level of structural control in LIPSS formation that has not been achieved before. Specifically, two and three intra-pulses lead to the formation of rock-like and tetrapod-like nanostructures, respectively. Based on simulations using a two-temperature model and electric field enhancement analysis, the formation mechanism of these unique structures is attributed to melt-dynamics mediated by localized electric field enhancement. Controlling the polarization (linear or circular) as well as the mode (single-pulse or GHz burst) diversifies surface nanostructures on a scale comparable to biological entities, thereby enabling systematic investigations of cell–material and bacteria–surface interactions that have remained unexplored.
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