How Light Drives Material Periodic Patterns Down to the Nanoscale

Rudenko, Anton; Colombier, Jean‐Philippe

doi:10.1007/978-3-031-14752-4_5

Cited by 7 publications

References 194 publications

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Excited‐State Dynamics and Optical Properties of Silica Under Ultrafast Laser Irradiation

Tsaturyan,

Kachan,

Stoian

et al. 2024

Advanced Physics Research

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Excited by intense infrared ultrafast light pulses, a wide bandgap material undergoes nonlinear ionization, generating a high density of free electrons in conduction states. As a result, the electronic band structure is critically modified and the bandgap shrinks. This induces rapid changes in optical properties, dramatically affecting the absorption spectrum during light coupling to the dielectric surface or during nonlinear propagation inside the bulk. This study analyzes the structural behavior and the modification of the optical properties of laser‐excited silica glass at the molecular cluster level through first‐principles simulations. Employing density functional theory and the GW approximations for band structure under nonequilibrium conditions, alongside the Bethe–Salpeter equation, the dynamics of the optical properties of fused silica are comprehensively explored. The behavior of excited fused silica in a wide photon energy range (from a few to 20 eV) is thus predicted. Laser‐induced electron excitation triggers a redistribution of charges between oxygen and silicon atoms, accompanied by a significant increase in electronic pressure, local atomic structure rearrangement, and material expansion. Molecular dynamics simulations offer a temporal perspective on the excited state dynamics, unveiling the intricate interplay between electronic and atomic effects on bandgap evolution. The analysis sheds light on excitonic resonances, intraband and interband transitions in fused silica under ultrafast laser irradiation, providing valuable insights into its excited state behavior and optical properties.

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Excited‐State Dynamics and Optical Properties of Silica Under Ultrafast Laser Irradiation

Tsaturyan,

Kachan,

Stoian

et al. 2024

Advanced Physics Research

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Probing Laser‐Driven Structure Formation at Extreme Scales in Space and Time

Bonse,

Sokolowski‐Tinten

2024

Laser & Photonics Reviews

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Irradiation of solid surfaces with high intensity, ultrashort laser pulses triggers a variety of secondary processes that can lead to the formation of transient and permanent structures over a large range of length scales from mm down to the nano‐range. One of the most prominent examples are LIPSS – Laser‐Induced Periodic Surface Structures. While LIPSS have been a scientific evergreen for of almost 60 years, experimental methods that combine ultrafast temporal with the required nm spatial resolution have become available only recently with the advent of short pulse, short wavelength free electron lasers. Here, the current status and future perspectives in this field are discussed by exploiting the unique possibilities of these 4th‐generation light sources to address by time‐domain experimental techniques the fundamental LIPSS‐question, namely why and how laser irradiation can initiate the transition of a “chaotic” (rough) surface from an aperiodic into a periodic structure.

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Beyond the Microscale: Advances in Surface Nanopatterning by Laser‐Driven Self‐Organization

Nakhoul,

Colombier

2024

Laser & Photonics Reviews

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Designing complex local properties that seamlessly integrate efficient functions into processed materials presents a formidable challenge. A promising solution has emerged in the form of ultrafast laser‐surface structuring. Through time‐controlled polarization ultrafast irradiation at the picosecond timescale, spontaneous self‐organization of surfaces can be induced. The thermal gradient length scale unfolds on the micro‐ and nanoscale, instigating thermoconvection that leads to structured surfaces upon quenching. Convective instabilities dynamically shape intricate yet self‐regulated periodic relief structures. The ability to achieve laser‐induced self‐organization in both surface dimensions holds immense scientific importance, as it unlocks the potential to create uniform periodic 2D patterns by harnessing the inherent regulation of nonlinear dynamics processes in fluids. This comprehensive review explores recent advances in understanding and leveraging ultrafast laser‐induced self‐organization for precise patterning across versatile scales and applications. The insights herein hold the potential to drive significant advancements in nanoscale manufacturing through 2D laser‐induced periodic surface structures.

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How Light Drives Material Periodic Patterns Down to the Nanoscale

Cited by 7 publications

References 194 publications

Excited‐State Dynamics and Optical Properties of Silica Under Ultrafast Laser Irradiation

Excited‐State Dynamics and Optical Properties of Silica Under Ultrafast Laser Irradiation

Probing Laser‐Driven Structure Formation at Extreme Scales in Space and Time

Beyond the Microscale: Advances in Surface Nanopatterning by Laser‐Driven Self‐Organization

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