Real-Time 3D Visualization of the Formation of Micrograting Structures Upon Direct Laser Interference Patterning of Ge
Laser & Photonics Rev. 17, 2300145 (2023)
In this work, a novel strategy is developed to combine deep-ultraviolet (UV) DLIP (λ = 193 nm, τ = 23 ns) and real-time optical reflectivity and diffraction techniques to unravel the formation dynamics of grating structures with periods down to Λ = 740 nm. Applied to crystalline Ge wafers, single-pulse topography modulation profiles with amplitudes up to 85 nm can be imprinted. Moreover, the dynamics of the melting and solidification processes, as well as the surface topography deformation, can be followed in real-time. Combined with a model, changes in topography over time with ns resolution can be obtained. The results unambiguously reveal that the formation process of the 3D structures can only be understood when taking both Marangoni convection and thermocapillary waves into account. The technique presented here has the potential to unravel the formation dynamics of a wide range of periodic structures in other materials.
In vitro comparative study between adhesion forces obtained on zirconia ceramic micromechanically treated with femtosecond laser (1027 nm), carbon dioxide laser (10,600 nm), and aluminum-oxide particles
Lasers in Medical Science volume 38, Article number: 194 (2023)
Bragg gratings inscribed in active waveguides combine very efficient reflective properties with the amplifying capability of rare-earths, which may lead to large amplification and lasing performance. However, the response of these photonic structures highly depends on the grating parameters and working conditions, so modeling their behavior and dependences becomes fundamental. In this work, a numerical method has been implemented to simulate the optical power propagation along an Er/Yb-codoped integrated waveguide Bragg grating as a function of its most relevant operational parameters. The results obtained show the optimal conditions to maximize its performance as a highly amplifying reflector, but also its capability as a monolithic laser. In addition, the modeling results adequately match experimental values measured in fs-laser written structures in Er/Yb-codoped phosphate glass, supporting the accuracy of the numerical method developed and its usefulness for further optimizing these promising photonic structures.
Temperature-Dependent Anisotropic Refractive Index in β-Ga2O3: Application in Interferometric Thermometers
Temperature behaviour of mixed-cation mixed-halide perovskite solar cells. Analysis of recombination mechanisms and ion migration
Organic Electronics 120 (2023) 106843
Numerical simulations using SILVACO ATLAS corroborate the role of SRH in the perovskite active layer for low and medium temperatures, and the crucial influence of spiro-OMeTAD transport properties in the device performance parameters.
Silicon oxynitride nanofilms prepared by PLD with controlled Eu-local concentration for broadband white light emitters
I. Camps, A. Mariscal-Jimenez, R.Serna
Applied Surface Science, volume 613
Ultrafast-laser powder bed fusion of oxygen-deficient Nb2O5 ceramics with highly improved electrical properties
B. Sotillo, R. Ariza, P. Fernández, J Solis
Materials & Design, volume 224
Filtering and Modulation from the Infrared to the Terahertz using Phase-Change Extraordinary Optical Transmission Metasurfaces
Euan Humphreys, Jacopo Bertolotti, Carlota Ruiz de Galarreta, Noemi Casquero, Jan Siegel, C. David Wright
PSS Rapid research letters, article 2200474
Rocío Ariza, Ana Urbieta, Javier Solis, Paloma Fernández
Materials, 15(21), 7733
S. Algaidya, D. Caudevilla, F. Perez-Zenteno, R. Garcia-Hernansanz, E. Garcia-Hemme, J. Olea, E. San Andres, S. Duarte-Cano, J. Siegel, J. Gonzalo, D. Pastor, A. del Prado
Materials Science in Semiconductor Processing, Volume 153, 107191 (2023)