A5089364338- Laser-induced spectroscopy and plasma
- Metal and Thin Film Mechanics
- Gas Sensing Nanomaterials and Sensors
- Laser Material Processing Techniques
- Diamond and Carbon-based Materials Research
- ZnO doping and properties
- Laser-Ablation Synthesis of Nanoparticles
- Analytical Chemistry and Sensors
- Electrocatalysts for Energy Conversion
- Electronic and Structural Properties of Oxides
- GaN-based semiconductor devices and materials
- Nonlinear Optical Materials Studies
- Ion-surface interactions and analysis
- Advanced battery technologies research
- Advanced Fiber Optic Sensors
- Electrochemical Analysis and Applications
- Photonic Crystals and Applications
- Solid State Laser Technologies
- Copper-based nanomaterials and applications
- Photonic and Optical Devices
- Surface Roughness and Optical Measurements
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Semiconductor materials and devices
- TiO2 Photocatalysis and Solar Cells
Foundation for Research and Technology Hellas
2014-2024
FORTH Institute of Electronic Structure and Laser
2004-2023
FORTH Institute of Chemical Engineering Sciences
2022
University of Crete
2005-2014
A new ethanol vapor detection probe based on an optical fiber long period grating overlaid with a zinc oxide (ZnO) nanorods layer is presented. The ZnO nanorod was developed onto the cladding of using aqueous chemical growth, seeded by thin metallic Zn. growth overlayer monitored in real time for investigating its effect spectral properties device and subsequent role sensing mechanism. Results are presented, correlation between performance. Reversible changes notch extinction ratio more than...
Temporally shaped, femtosecond laser pulses have been used for controlling the size and morphology of micron-sized metallic structures obtained by using Laser Induced Forward Transfer (LIFT) technique. We report effect pulse shaping on deposited Au, Zn, Cr a function separation time ??t (from 0 to 10 ps) double variable intensities generated liquid crystal spatial light modulator (SLM). The observed differences in are correlated with outcome pump-probe experiments study electron-phonon...
The fabrication of nanostructures with controlled assembly and architecture is significant for the development novel nanomaterials-based devices. In this work we demonstrate that laser techniques coupled low-temperature hydrothermal growth enable complex three-dimensional ZnO nanorods patterning on various types substrates geometries. suggested methodology based a procedure involving 3D scaffold using Multi-Photon Lithography photosensitive material, followed by Zn seeded Aqueous Chemical...
A comparative study is presented on the growth of ZnO thin films by ultraviolet pulsed-laser deposition using nanosecond and femtosecond pulses at 248nm. Different experimental parameters were examined including substrate temperature, oxygen ambient pressure, laser energy density target. At optimum conditions grown exhibited high optical transmittance a preferential orientation along c axis, both with irradiations. However, those produced ultrashort are composed smaller dimension...
A new optical gas sensor platform based on highly luminescent ZnO-polymer nanohybrids is demonstrated. The consist of ZnO nanoparticles, typically 125 (±25) nm in size, dispersed an inert cross-linked polydimethylsiloxane (PDMS) matrix. Upon exposure to ethanol-enriched air at room temperature, the nanocomposites exhibit a clear increase their photoluminescence (PL) emission, which shows nearly Langmuir dependence alcohol vapor pressure. response time order 50 s, particularly low ethanol...
The processing of vertical graphene nanowalls (VGNWs) via laser irradiation is proposed as a means to modulate their physicochemical properties. effects the number applied pulses and fluence each pulse are examined. Raman spectroscopy studies effect on chemical structure VGNWs. Results show decrease in density defects layers, which points toward mechanism including evaporation amorphous or loosely bonded C from defective recrystallization graphene. Moreover, parameters morphology Mo thin...
Thin Nd-doped potassium gadolinium tungstate [KGW or KGd(WO4)2] films are grown by pulsed laser deposition ablation of a stoichiometric monocrystal target. Rutherford backscattering, x-ray diffraction, atomic force microscopy, and waveguide propagation analyses performed. The as-grown optically active, as evidenced the photoluminescence spectra centered at 1.068 μm. In some films, fine between Stark levels observed.
We report the growth of thin films ferromagnetic half-Heusler alloy NiMnSb by pulsed-laser deposition on Si (111) and polycrystalline InAs substrates. Highly crystalline are grown using low substrate temperatures (190–210 °C), without any postdeposition annealing. The structural, magnetic, transport properties relatively consistent with those bulk used as target, which suggests that layers this material laser ablation could be in multilayer structures effective spin-polarized conducting layers.
Pb thin films were deposited on Nb substrates by means of pulsed laser deposition (PLD) with UV radiation (248 nm), in two different ablation regimes: picosecond (5 ps) and subpicosecond (0.5 ps). Granular grain size the micron scale have been obtained, no evidence large droplet formation. All presented a polycrystalline character preferential orientation along (111) crystalline planes. A maximum quantum efficiency (QE) $7.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ (at 266 nm...
Optically activated indium oxide diffractive optical microstructures are demonstrated through a two step laser based fabrication method. Nonstoichiometric thin film material grown by reactive pulsed deposition has been selectively transferred onto glass substrates ultrashort pulse microprinting to form surface relief microstructures. Subsequent ultraviolet illumination induced dynamic refractive index changes, which result in all control of the grating diffraction efficiency. The direct...
We investigated the relative merits and limits of pulsed laser deposition from AlN targets in vacuum low-pressure nitrogen obtaining stoichiometric crystalline aluminum nitride thin films. used two UV excimer sources (λ=248 nm): a nanosecond system (τFWHM=30 ns) and, subpicosecond (τFWHM=450 fs) system. The obtained structures were characterized by x-ray diffraction, electron microscopy cross section, selected area profilometry. demonstrated that best results are with sub-ps source low...
Modifications of shallow electron trap states near conduction band was analyzed after surface structuring TiO2 thin films prepared via pulsed laser deposition method. Laser-induced periodic structures (LIPSS) were produced on the large-area irradiation with femtosecond KrF (λ = 248 nm). While spatial period LIPSS Λ ≈ 190 ± 10 nm not affected by fluence, coherence increased an increase dose. Time-resolved microwave conductivity measurements accompanied theoretical modelling revealed energetic...