Origin of laser-induced near-subwavelength ripples: interference between surface plasmons and incident laser.

By Min Huang, F. Zhao, Ya Cheng, N. Xu, Zhi‐zhan Xu. ACS Nano, 2009

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Fabrication of Micro/Nano Structures on Metals by Femtosecond Laser Micromachining (2014, background): “According to the SPP model, the periodicity of the FLIPSS is given by [100,101]: = [ ]± (11) and η = ∈ ∈(∈ ∈ ) (12) Where Re[η] is the real part of the effective refractive index of the metal-dielectric interface for surface plasmons and ∈ and ∈ are dielectric constants of the metal and of the mediu”
The TriBeam system: Femtosecond laser ablation in situ SEM (2015, background): “[58], surface plasmons are generatedwhen an ultrashort pulse interacts with a sample surface.”
Laser-Induced Periodic Surface Structures— A Scientific Evergreen (2017, background): “Therefore, some authors call these nanostructures deep-subwavelength ripples [33], [34].”