From Femtosecond Laser Processing to Millimeter-Scale Nanowires: Multiscale Material Design for Next-Generation Devices

Recent progress in ultrafast laser-matter interaction has enabled new approaches for engineering materials across multiple length scales with high spatial precision and limited thermal damage. Femtosecond laser processing, in particular, offers a flexible and maskless method for tailoring surface and near-surface structures while preserving underlying material integrity. This study investigates a multiscale materials design strategy that links femtosecond laser-induced surface modification with the formation and integration of extended nanowire architectures. The influence of laser processing parameters on surface morphology, structural anisotropy, and nanowire nucleation behavior is examined across nano-, micro-, and millimeter-length scales. By correlating hierarchical structural features with electrical, optical, and mechanical responses, the work highlights how controlled laser-generated templates can support coherent nanowire growth and functional continuity over extended dimensions. The results provide insights into the role of ultrafast laser processing as a unifying tool for multiscale material engineering, with relevance to electronic, photonic, sensing, and energy-related device platforms.