C. N. Afonso
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View article: Laser Treatment of Ag@ZnO Nanorods as Long-Life-Span SERS Surfaces
Laser Treatment of Ag@ZnO Nanorods as Long-Life-Span SERS Surfaces Open
UV nanosecond laser pulses have been used to produce a unique surface nanostructuration of Ag@ZnO supported nanorods (NRs). The NRs were fabricated by plasma enhanced chemical vapor deposition (PECVD) at low temperature applying a silver l…
View article: Dynamics of fast pattern formation in porous silicon by laser interference
Dynamics of fast pattern formation in porous silicon by laser interference Open
Patterns are fabricated on 290 nm thick nanostructured porous silicon layers by phase-mask laser interference using single pulses of an excimer laser (193 nm, 20 ns pulse duration). The dynamics of pattern formation is studied by measuring…
View article: Ultraviolet laser patterning of porous silicon
Ultraviolet laser patterning of porous silicon Open
This work reports on the fabrication of 1D fringed patterns on nanostructured porous silicon (nanoPS) layers (563, 372, and 290 nm thick). The patterns are fabricated by phase-mask laser interference using single pulses of an UV excimer la…
View article: Importance of ion bombardment during coverage of Au nanoparticles on their structural features and optical response
Importance of ion bombardment during coverage of Au nanoparticles on their structural features and optical response Open
This work studies the changes in the optical response and morphological features of 6 ± 1 nm diameter Au nanoparticles (NPs) when covered by a layer of a-Al2O3 by pulsed laser deposition (PLD). The laser fluence used for ablating the Al2O3…
View article: Laser ablation of ceramic Al2O3 at 193 nm and 248 nm: The importance of single-photon ionization processes
Laser ablation of ceramic Al2O3 at 193 nm and 248 nm: The importance of single-photon ionization processes Open
The aim of this work is to demonstrate that single-photon photoionization processes make a significant difference in the expansion and temperature of the plasma produced by laser ablation of ceramic Al2O3 in vacuum as well as to show their…
View article: Relevance and formation mechanisms of negative ions upon ablation of Al<sub>2</sub>O<sub>3</sub>
Relevance and formation mechanisms of negative ions upon ablation of Al<sub>2</sub>O<sub>3</sub> Open
The aim of this work is to study the significance of negative ions in the plasma produced by ablation of a simple oxide ceramic target (Al 2 O 3 ) at distances and fluences typically used in pulsed-laser deposition processes. The results s…
View article: Ag based patterns produced by laser phase-mask interference
Ag based patterns produced by laser phase-mask interference Open
11th. International Conference on Laser Ablation, Playa del Carmen, Mexico, November 13-19 2011
View article: Exploiting optical near-fields for phase change memories and nanopatterning
Exploiting optical near-fields for phase change memories and nanopatterning Open
11th. International Conference on Laser Ablation, Playa del Carmen, Mexico, November 13-19 2011
View article: Mass transport and nanoparticle alignment in gold patterns produced by laser interference
Mass transport and nanoparticle alignment in gold patterns produced by laser interference Open
11th. International Conference on Laser Ablation, Playa del Carmen, Mexico, November 13-19 2011
View article: Dynamics of laser-induced phase switching in GeTe films
Dynamics of laser-induced phase switching in GeTe films Open
Phase switching in GeTe thin films (grown using a modified metal organic chemical vapor deposition system) upon pulsed femtosecond and nanosecond laser irradiation has been studied. Two in situ methods, i.e., optical microscopy and real-ti…
View article: Coverage induced regulation of Au nanoparticles during pulsed laser deposition
Coverage induced regulation of Au nanoparticles during pulsed laser deposition Open
The effects induced during the covering/embedding of metal nanoparticles (NPs) produced by pulsed laser deposition (PLD) and their impact on the structural and optical properties have been studied by producing pairs of samples containing A…
View article: Ultrafast phase transitions: from fundamentals to data storage
Ultrafast phase transitions: from fundamentals to data storage Open
European Symposium on Phase Change and Ovonic Science, Politecnico di Milano, Milán Italy, September 6-7, 2010
View article: Exploiting optical near-fields for phase switching and nanopatterning
Exploiting optical near-fields for phase switching and nanopatterning Open
European Symposium on Phase Change and Ovonic Science, Politecnico di Milano, Milan, Italy, September 6-7, 2010
View article: Ultraviolet optical near-fields of microspheres imprinted in phase change films
Ultraviolet optical near-fields of microspheres imprinted in phase change films Open
We report an experimental method for directly imaging optical near-fields of dielectric microspheres upon illumination with ultraviolet nanosecond laser pulses. The intensity distribution is imprinted in chalcogenide films leaving behind a…
View article: Interaction of self-trapped beams in high index glass
Interaction of self-trapped beams in high index glass Open
We observe attraction, repulsion and energy exchange between two self-trapped beams in a heavy-metal-oxide glass exhibiting a Kerr-like response with multiphoton absorption. The coherent interaction between spatial solitons is controlled b…
View article: Imprinting the Optical Near Field of Microstructures with Nanometer Resolution
Imprinting the Optical Near Field of Microstructures with Nanometer Resolution Open
An experimental method to directly image with nanometer spatial resolution complex 2D near-field intensity distributions underneath the scattering particle by imprinting a 2D pattern in thin photosensitive films, was demonstrated. The sput…
View article: Quantification of self-sputtering and implantation during pulsed laser deposition of gold
Quantification of self-sputtering and implantation during pulsed laser deposition of gold Open
This work reports on the quantification of self-sputtering and implantation occurring during pulsed laser deposition of Au as a function of the laser fluence used to ablate the gold target. The experimental approach includes, on one hand, …
View article: Amorphization dynamics of Ge2Sb2Te5 films upon nano- and femtosecond laser pulse irradiation
Amorphization dynamics of Ge2Sb2Te5 films upon nano- and femtosecond laser pulse irradiation Open
Phase transformations of crystalline Ge2Sb2Te5 films upon pulsed laser irradiation have been studied using in situ reflectivity measurements with temporal resolution. Two different configurations allowed point probing with nanosecond tempo…
View article: Size dispersion effects on the low-frequency Raman scattering of quasispherical silver nanoparticles: Experiment and theory
Size dispersion effects on the low-frequency Raman scattering of quasispherical silver nanoparticles: Experiment and theory Open
The coupling between surface plasmon polaritons and confined acoustic vibrations in embedded silver nanoparticles is studied both theoretically and experimentally. The inelastic light scattering spectra simulated assuming deformation poten…