Multifractal characterization of femtosecond laser-induced herringbone patterns. (14th December 2020)

• Record Type: Journal Article
• Authors: Mitra, Vramori; Garcell, Erik M; ElKabbash, Mohamed; Neogi, Anupam; Guo, Chunlei
• Is Part Of: JPhys photonics. Volume 3:Number 1(2021)
• Publication Date: 2020-12-14
• Subjects: fractal analysis -- laser induced periodic surface structures -- femtosecond laser processing; Photonics -- Periodicals; 621.365
• DOI: 10.1088/2515-7647/abcb73
• Languages: English
• ISSNs: 2515-7647

Abstract

Abstract: Analysis of surface structures formed due to femtosecond laser surface ablation is usually done through subjective assessment of the surface images. Here, we analyze the evolution of femtosecond laser-induced surface structures using multifractal analysis. We computed the singularity spectrum to characterize the behavior of laser-induced herringbone patterns. The surface morphology of the ablated surface shows a polarization dependent multifractal nature. The singularity spectrum depicts three distinct morphological phases that sequentially form as a function of the laser pulse number. We objectively characterize the laser-dependent morphological properties of herringbone structures. Multifractal analysis was able to reflect the hierarchy, uniformity, and roughness of the formed structures and their dependence on the pulse number and polarization.