Abstract: Based on the surface plasmon wave interference phenomenon during the preparation of laser-induced periodic surface structures (LIPSS), xushaolin research group of ultrafast laser micro nano manufacturing laboratory of South University of science and technology revealed the electromagnetic origin of disordered generation of LIPSS in large-area processing, and successfully used this phenomenon to achieve large-area and efficient preparation of long-range ordered subwavelength patterned structures.
Key words: Laser & Photonics reviews, laser induced periodic surface structure, self-aligned growth, efficient and controllable preparation of sub wavelength structure, ultrafast laser micro nano manufacturing laboratory of South University of science and technology.
Surface nano patterning is an important way to realize various high value-added functional surfaces, such as the control of optical, thermal, electrical and mechanical properties. Laser induced periodic surface structures (lips) is an effective technology to realize nano patterning. Compared with lithography and laser direct writing, LIPSS can realize parallel processing with sub wavelength feature structure in a large range. LIPSS technology has been widely used in bionic structure coloring, solar thermal conversion, surface enhanced Raman scattering (SERS), wettability control and data storage. However, LIPSS prepared by large-area processing often have local uneven characteristics such as dislocation, bending and bifurcation, resulting in the lack of long-range ordering of the prepared nanostructures, which limits its further application.
To solve the above problems, the xushaolin research group of ultrafast laser micro nano manufacturing laboratory of South University of science and technology has revealed a mechanism for the formation of local heterogeneity of LIPSS - half periodic mismatched optical enhancement (h-moe). This mechanism is mainly caused by the interference of surface plasmon polaritons (SPPs) scattered by the formed LIPSS, and causes the half cycle dislocation between the subsequent generated LIPSS and the generated LIPSS, resulting in the local non-uniform characteristics of LIPSS in continuous machining. However, the researchers further found that the h-moe effect can be stably excited and has certain robustness. By stably exciting this effect, the non-uniform formation of LIPSS can be effectively avoided, and the subsequent LIPSS self-aligned growth can be made, which is conducive to the manufacture of long-range ordered subwavelength periodic structures in a large range. It is worth noting that by designing specific processing strategies, the h-moe based subwavelength structure preparation technology can further achieve the efficient preparation of patterned structures such as ultra-straight gratings, orientation controllable corrugated gratings and nanohole chain arrays.
By systematically studying the electromagnetic origin in the process of uneven generation of LIPSS, this work has realized the self-aligned generation and large-area controllable preparation of LIPSS for the first time, and provided a new idea for the subsequent preparation and application of diversified controllable sub wavelength patterns based on LIPSS. Relevant papers were published online in Laser & Photonics reviews.
WILEY
Thesis information:
Self‐Aligned Laser‐Induced Periodic Surface Structures for Large‐Area Controllable Nanopatterning
Jiaxu Huang, Kang Xu, Shaolin Xu*, Xiaowei Li, and Qi-Huo Wei
Laser & Photonics Reviews
DOI: 10.1002/lpor.202200093
source：ASNChina AdvancedScienceNews
