Laser-assisted coloration of Ti: oxides or nanostructures?

TL;DR

This paper investigates how picosecond laser pulses in liquids create self-organized nanostructures on titanium, leading to coloration, with findings suggesting an avalanche-like increase in nanostructure density and potential auto-SERS effects.

Contribution

It demonstrates the formation of nanostructures on titanium via laser ablation in liquids and explores their role in coloration and Raman signal enhancement.

Findings

Nanostructure density increases avalanche-like with laser pulses

Raman peaks suggest auto-SERS effect

Coloration linked to nanostructure formation

Abstract

Coloration of a Ti target under its ablation with picosecond laser pulses in liquids is ascribed to the formation of self-organized nanostructures. The density of nanostructures increases in an avalanche-like way with the number of laser pulses. The Raman peaks observed in the laser-exposed areas may be due to the auto-SERS effect.