Razvan Stoian
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View article: Dynamic Ultrafast Laser-Induced Structural Changes and Extreme Nanostructuring in Hard Dielectric Materials
Dynamic Ultrafast Laser-Induced Structural Changes and Extreme Nanostructuring in Hard Dielectric Materials Open
International audience
View article: Excited‐State Dynamics and Optical Properties of Silica Under Ultrafast Laser Irradiation
Excited‐State Dynamics and Optical Properties of Silica Under Ultrafast Laser Irradiation Open
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…
View article: Making Light Matter
Making Light Matter Open
International audience
View article: Polarization-Dependent Anisotropy of LIPSSs’ Morphology Evolution on a Single-Crystal Silicon Surface
Polarization-Dependent Anisotropy of LIPSSs’ Morphology Evolution on a Single-Crystal Silicon Surface Open
Utilizing the principle of laser-induced periodic surface structures (LIPSSs), this research delves into the morphological evolution of single-crystal silicon surfaces irradiated by a near-infrared picosecond laser through a scanning mode.…
View article: Quantitative Mapping of Transient Thermodynamic States in Ultrafast Laser Nanostructuring of Quartz
Quantitative Mapping of Transient Thermodynamic States in Ultrafast Laser Nanostructuring of Quartz Open
Understanding material structural reaction to light is of utmost importance to advance processing resolution in ultrafast laser volume structuring into the nanoscale. Selective thermodynamic pathways are required to quench energy transport…
View article: Ultrafast laser volume nanostructuring; a limitless perspective
Ultrafast laser volume nanostructuring; a limitless perspective Open
Ultrafast lasers are now unanimously recognized as processing tools capable of providing utmost precision. This becomes key in the context of material processing as precise feature scales can render a range of new characteristics to the pr…
View article: Asymmetric Shaping for Ultrafast Elliptical Bessel-like Beams
Asymmetric Shaping for Ultrafast Elliptical Bessel-like Beams Open
The generation of an elliptical Bessel–Gauss beam has become a topic of interest in ultrafast laser processing of transparent materials because of its nearly non-diffractive elliptical central core. These beams can show potential in genera…
View article: Ultrafast laser-induced plasma anisotropy in pristine and surface pre-structured zinc telluride, probed by terahertz pulses
Ultrafast laser-induced plasma anisotropy in pristine and surface pre-structured zinc telluride, probed by terahertz pulses Open
We use THz probe pulses to detect and analyze the dynamics of charge transport anisotropies generated by ultrafast laser two-photon absorption in Zinc Telluride (ZnTe) semi-insulating crystal showing smooth and laser structured surfaces. T…
View article: Development of a 3D ultrafast laser written near-infrared spectro-interferometer
Development of a 3D ultrafast laser written near-infrared spectro-interferometer Open
Direct ultrafast laser photoinscription of transparent materials is a powerful technique for the development of embedded 3D photonics. This is particularly adaptable for astrophotonic devices when a number of inputs are required. The proce…
View article: Ultrafast Cylindrical Vector Beams for Improved Energy Feedthrough and Low Roughness Surface Ablation of Metals
Ultrafast Cylindrical Vector Beams for Improved Energy Feedthrough and Low Roughness Surface Ablation of Metals Open
The use of ultrafast cylindrical vector vortex beams in laser–matter interactions permits new ablation features to be harnessed from inhomogeneous distributions of polarization and beam geometry. As a consequence, the ablation process can …
View article: Polarization-Dependent Scattering of Nanogratings in Femtosecond Laser Photowritten Waveguides in Fused Silica
Polarization-Dependent Scattering of Nanogratings in Femtosecond Laser Photowritten Waveguides in Fused Silica Open
The properties of polarization-selective, light-guiding systems upon subwavelength nanogratings formation in the case of type II refractive index traces induced by femtosecond laser pulses in bulk fused silica were studied. Polarization-de…
View article: Waveguide scattering antennas made by direct laser writing in bulk glass for spectrometry applications in the short-wave IR
Waveguide scattering antennas made by direct laser writing in bulk glass for spectrometry applications in the short-wave IR Open
A buried straight waveguide perturbed periodically by six antennas composed of submicronic cylinder voids is entirely fabricated using ultrafast laser photoinscription. The light scattered from each antenna is oriented vertically and is de…
View article: Publisher’s Note: “Ultrafast bandgap narrowing and cohesion loss of photoexcited fused silica” [J. Chem. Phys. 156, 224301 (2022)]
Publisher’s Note: “Ultrafast bandgap narrowing and cohesion loss of photoexcited fused silica” [J. Chem. Phys. 156, 224301 (2022)] Open
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View article: Ultrafast bandgap narrowing and cohesion loss of photoexcited fused silica
Ultrafast bandgap narrowing and cohesion loss of photoexcited fused silica Open
Coupling and spatial localization of energy on ultrafast timescales and particularly on the timescale of the excitation pulse in ultrashort laser irradiated dielectric materials are key elements for enabling processing precision beyond the…
View article: Index Modulation Embedded in Type I Waveguide Written by Femtosecond Laser in Fused Silica
Index Modulation Embedded in Type I Waveguide Written by Femtosecond Laser in Fused Silica Open
Slit-shaped laser beams focused in bulk optical materials can realize embedded waveguides with circular cross sections consisting of positive index change type I traces. In these kinds of waveguide traces, a peculiar periodical refractive …
View article: Structural instability of transition metals upon ultrafast laser irradiation
Structural instability of transition metals upon ultrafast laser irradiation Open
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View article: Full Explicit Numerical Modeling in Time-Domain for Nonlinear Electromagnetics Simulations in Ultrafast Laser Nanostructuring
Full Explicit Numerical Modeling in Time-Domain for Nonlinear Electromagnetics Simulations in Ultrafast Laser Nanostructuring Open
The purpose of this paper is to present a new and accurate, fully explicit finite-difference time-domain method for modeling nonlinear electromagnetics. The approach relies on a stable algorithm based on a general vector auxiliary differen…