Tomasz J. Ochalski
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View article: Recombination processes in MBE grown Al0.85Ga0.15As0.56Sb0.44
Recombination processes in MBE grown Al0.85Ga0.15As0.56Sb0.44 Open
Quaternary AlGaAsSb alloys have exhibited low excess noise characteristics as gain regions in avalanche photodiodes. In this work, optical spectroscopy techniques are used to demonstrate the recombination dynamics in molecular beam epitaxy…
View article: Raman spectra of micellar casein powders prepared with wet blending of glycomacropeptide and micellar casein concentrate
Raman spectra of micellar casein powders prepared with wet blending of glycomacropeptide and micellar casein concentrate Open
Understanding the molecular properties and interactions of components within high‐protein dairy powders is important in predicting rehydration performance. Raman spectroscopy was used to generate molecular information which provided insigh…
View article: Design, Theoretical, and Experimental Investigation of Tensile-Strained Germanium Quantum-Well Laser Structure
Design, Theoretical, and Experimental Investigation of Tensile-Strained Germanium Quantum-Well Laser Structure Open
Strain and band gap engineered epitaxial germanium (ϵ-Ge) quantum-well (QW) laser structures were investigated on GaAs substrates theoretically and experimentally for the first time. In this design, we exploit the ability of an InGaAs laye…
View article: Influence of pH adjustment on physicochemical properties of microfiltration retentates of skim milk and rehydration properties of resulting powders
Influence of pH adjustment on physicochemical properties of microfiltration retentates of skim milk and rehydration properties of resulting powders Open
Effects of pH adjustment on physicochemical properties of microfiltration retentates of skim milk and rehydration of resulting micellar casein concentrate (MCC) powders were investigated. Aliquots of retentate (pH 6.9) were adjusted to pH …
View article: Carrier and refractive index dynamics in core-shell nanolasers grown on silicon during spontaneous and stimulated emission
Carrier and refractive index dynamics in core-shell nanolasers grown on silicon during spontaneous and stimulated emission Open
In this work, we experimentally study the carrier and refractive index dynamics of InGaAs nanopillar grown on a Si on insulator (SOI) substrate. The recombination process of the InGaAs NP is characterized with different optical techniques.…
View article: Resonant gratings with an etch-stop layer and a fabrication-error tolerant design
Resonant gratings with an etch-stop layer and a fabrication-error tolerant design Open
Sub-wavelength gratings (SWG) have shown much promise for applications such as lightweight high bandwidth reflectors, polarising filters and focusing lenses. Unfortunately, grating performance may be rapidly degraded through variability in…
View article: Monolithic InGaAs Nanowire Array Lasers on Silicon-on-Insulator Operating at Room Temperature
Monolithic InGaAs Nanowire Array Lasers on Silicon-on-Insulator Operating at Room Temperature Open
Chip-scale integrated light sources are a crucial component in a broad range of photonics applications. III-V semiconductor nanowire emitters have gained attention as a fascinating approach due to their superior material properties, extrem…
View article: Heterogeneously grown tunable group-IV laser on silicon
Heterogeneously grown tunable group-IV laser on silicon Open
Tunable tensile-strained germanium (epsilon-Ge) thin films on GaAs and heterogeneously integrated on silicon (Si) have been demonstrated using graded III-V buffer architectures grown by molecular beam epitaxy (MBE). epsilon-Ge epilayers wi…
View article: Improved room-temperature luminescence of core-shell InGaAs/GaAs nanopillars via lattice-matched passivation
Improved room-temperature luminescence of core-shell InGaAs/GaAs nanopillars via lattice-matched passivation Open
Optical properties of GaAs/InGaAs/GaAs nanopillars (NPs) grown on GaAs(111)B were investigated. Employment of a mask-etching technique allowed for an accurate control over the geometry of NP arrays in terms of both their diameter and separ…