Femtosecond Laser Modulation of Surface Properties

Femtosecond laser modulation of surface properties harnesses ultrashort laser pulses to sculpt and functionalise material interfaces with submicrometre precision. By varying pulse duration, energy, polarisation and scanning strategies, a rich variety of micro- and nanoscale patterns can be inscribed on metals, semiconductors, polymers and dielectrics. The underlying mechanisms combine electromagnetic effects—such as surface plasmon excitation and near-field enhancement—with rapid melting, hydrodynamic flow and resolidification, giving rise to self-organised periodic surface ripples, grooves and spikes. These structures enable tailored optical reflectivity, wettability, mechanical friction, biocompatibility and chemical reactivity. Recent advances in beam shaping, burst-mode delivery and polarisation control have expanded the accessible surface morphologies, paving the way for antibacterial coatings, antireflective blackbodies, drag-reducing tribological interfaces and on-chip photonic components. The versatility, single-step nature and minimal heat-affected zones of femtosecond processing underpin its growing industrial and biomedical significance.

Research from Nature Portfolio

Recent studies have demonstrated record-speed fabrication of highly regular periodic structures on a range of metals by linking the regularity of laser-induced ripples to the decay length of excited surface electromagnetic waves, and by optimising spot size to match these decay lengths over large areas. Another investigation has shown that ultrashort-pulse surface texturing can suppress bacterial adhesion through dual control of surface topography and wettability, producing spike, ripple and nano-pillar arrays that reduce retention of both rod-shaped and spherical bacteria by more than 99 %. A further work has elucidated the common electromagnetic origin of subwavelength periodic ordering in both surface and bulk of dielectric materials, revealing that near-field enhancement at scattering centres and multipulse accumulation govern the transition between high- and low-spatial-frequency ripples.

Femtosecond Laser Modulation of Surface Properties publication trend

The graph below shows the total number of articles in femtosecond laser modulation of surface properties across all publications each year (not limited to Nature Index journals).

Technical terms

Femtosecond laser: A laser emitting pulses of around 10⁻¹⁵ s duration, enabling high-precision ablation with minimal heat diffusion.

Laser-induced periodic surface structures (LIPSS): Self-organised ripples with sub-wavelength periodicity formed by interference of incident and scattered light or plasmonic waves.

Surface plasmon polariton: A coupled oscillation of electrons and electromagnetic field at a metal–dielectric interface that confines energy at the nanoscale.

Burst mode: A pulse delivery regime in which trains of closely spaced femtosecond pulses are emitted in rapid succession to enhance near-field interactions.

Hydrodynamic instability: Fluid-dynamic phenomena occurring in transient melt pools, driving pattern formation during ultrafast resolidification.

References

1. High-speed manufacturing of highly regular femtosecond laser-induced periodic surface structures: physical origin of regularity. Scientific Reports (2017).
2. Towards Laser-Textured Antibacterial Surfaces. Scientific Reports (2018).
3. Spontaneous periodic ordering on the surface and in the bulk of dielectrics irradiated by ultrafast laser: a shared electromagnetic origin. Scientific Reports (2017).
4. Two-dimensional laser-induced periodic surface structures formed on crystalline silicon by GHz burst mode femtosecond laser pulses. International Journal of Extreme Manufacturing (2023).
5. Ultrawide Spectrum Metallic Plane Blackbody with Extremely High Absorption from 0.2 to 25 µm. Advanced Science (2024).
6. Line-shaped laser lithography for efficient fabrication of large-area subwavelength nanogratings. Optica (2023).