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Full-Text Articles in Physics
Wettability And “Petal Effect” Of Gaas Native Oxides, A. Gocalinska, Kamil Gradkowski, V. Dimastrodonato, L. O. Mereni, G. Juska, Guillaume Huyet, E. Pelucchi
Wettability And “Petal Effect” Of Gaas Native Oxides, A. Gocalinska, Kamil Gradkowski, V. Dimastrodonato, L. O. Mereni, G. Juska, Guillaume Huyet, E. Pelucchi
Cappa Publications
We discuss unreported transitions of oxidised GaAs surfaces between (super)hydrophilic and hydrophobic states when stored in ambient conditions. Contact angles higher than 90° and high adhesive force were observed for several air-aged epitaxial samples grown under different conditions, as well as on epi-ready wafers. Regardless of the morphologies of the surface, superhydrophilicity of oxygen-plasma treated samples was observed, an effect disappearing with storage time. Reproducible hydrophobicity was likewise observed, as expected, after standard HCl surface etching. The relation between surface oxides and hydrophobic/hydrophilic behaviour is discussed.
Excitability In Optically Injected Semiconductor Lasers: Contrasting Quantum- Well- And Quantum-Dot-Based Devices, Bryan Kelleher, C. Bonatto, Guillaume Huyet, Stephen P. Hegarty
Excitability In Optically Injected Semiconductor Lasers: Contrasting Quantum- Well- And Quantum-Dot-Based Devices, Bryan Kelleher, C. Bonatto, Guillaume Huyet, Stephen P. Hegarty
Cappa Publications
Excitability is a generic prediction for an optically injected semiconductor laser. However, the details of the phenomenon differ depending on the type of device in question. For quantum-well lasers very complicated multipulse trajectories can be found, while for quantum-dot lasers the situation is much simpler. Experimental observations show the marked differences in the pulse shapes while theoretical considerations reveal the underlying mechanism responsible for the contrast, identifying the increased stability of quantum-dot lasers to perturbations as the root.