The Double-edged Sword of Femtosecond Laser-Induced Periodic Surface Structures for Sub-diffraction and High-efficient Nanotexturing

摘要

Laser-induced periodic surface structures (LIPSS) have gained lots of attention for the rich physics and potentials in subdiffractionnanostructuring. Herein, we report new aspects of LIPSS to uniformly extend the periodicity to macro, orconversely suppress the periodicity to obtain freeform nanostructures. We have focused on the electron excitation,effective surface permittivity modifications, and plasmonic standing wave ablation for the structure origination andevolution. A plasmonic nanoimprinting model in long range and a nanohole-based light field enhancement in thenearfield are proposed, which are in good accord with the experiments. The nanotextured surface is obtained in a largearea by light tailoring method with a cylindrical lens focusing and scanning. Besides, a critical power control method toconfine the light field in nanoregion are conducted to obtain the freeform nanostructures, which have potentialapplications in birefringent optics and nanoscience.