A5061040769- Spectroscopy and Quantum Chemical Studies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Laser-Matter Interactions and Applications
- Molecular Junctions and Nanostructures
- Photochemistry and Electron Transfer Studies
- Thermography and Photoacoustic Techniques
- Photorefractive and Nonlinear Optics
- Photosynthetic Processes and Mechanisms
- Advanced Fiber Laser Technologies
- Near-Field Optical Microscopy
- Advanced Fluorescence Microscopy Techniques
- Solid State Laser Technologies
- Advanced Chemical Physics Studies
- Soft Robotics and Applications
- Photoacoustic and Ultrasonic Imaging
- Spectroscopy and Laser Applications
- Infrared Thermography in Medicine
- Laser Material Processing Techniques
- Nonlinear Optical Materials Studies
- Gold and Silver Nanoparticles Synthesis and Applications
- Laser Design and Applications
- Molecular spectroscopy and chirality
- Photonic and Optical Devices
- Lipid Membrane Structure and Behavior
- Nonlinear Optical Materials Research
University of Limerick
2016-2024
Atomic Energy Commission of Syria
2007-2016
University of Namur
1999-2012
University of Illinois Urbana-Champaign
1969-2004
University of Liège
1999
Two-color sum-frequency generation spectroscopy (2C-SFG) is used to probe the molecular and electronic properties of an adsorbed layer green fluorescent protein mutant 2 (GFPmut2) on a platinum (111) substrate. First, spectroscopic measurements, performed under different polarization combinations, atomic force microscopy (AFM) show that GFPmut2 proteins form fairly ordered monolayer surface. Next, nonlinear data provide evidence particular coupling phenomena between vibrational properties....
We report on the performances of mode locking a flash-lamp-pumped Nd:YAG laser using frequency-doubling nonlinear mirror combined with two-photon absorber. Pulse lengths from 12 to 8 ps are generated. show that flat shape pulse-train envelope generated by oscillator is adapted for synchronous pumping optical parametric oscillators and we demonstrate efficient generation an infrared beam tunable 3800 1100 cm−1 bandwidth 2 in one single conversion stage LiNbO3 or AgGaS2. The “all-solid-state”...
A numerical study is made of the impurity photovoltaic (IPV) effect in crystalline Si p-n junction solar cells. Application to In impurities whose energy level at 0.157 eV above valence band edge. The resolution Poisson’s equation and continuity equations for electrons, holes defect levels yields current–voltage curves different concentrations Nt, from which short-circuit current density Jsc, open-circuit voltage Voc, conversion efficiency η obtained. It shown that increasing concentration...
The orientation of thiophenol adsorbed on silver is determined by comparing ab initio calculated and experimental sum-frequency generation (SFG) spectra measured between 9 20 μm using a tandem KTP/CdSe optical parametric oscillator. molecule S−C bond tilted ∼37° from the surface normal with aromatic ring plane perpendicular to surface.
The knowledge of the first hyperpolarizability tensor elements molecular groups is crucial for a quantitative interpretation sum frequency generation (SFG) activity thin organic films at interfaces. Here, SFG response terminal methyl group dodecanethiol (DDT) monolayer has been interpreted on basis calculations performed density functional theory (DFT) level approximation. In particular, DFT have carried out three classes models aliphatic chains. class consists chains, containing from 3 to...
This position paper provides a topical overview on the translation of infrared (IR)‐based imaging techniques in metrological applications related to advance manufacturing with particular focus situ obtain real‐time process information. Fast using optical, X‐ray, e‐beam, ultrasound, or scanning probes are widely used non‐destructive testing (NDT), which metrology requires detailed consideration technique question as well instrumentation and adaption choices available. We review use IR for...
Efficient mode locking of a flash-lamp-pumped Nd:YAG laser at 1.064 μm is achieved by combining the passive–positive feedback frequency doubling nonlinear mirror (FDNLM) and passive–negative GaAs platelet. FDNLM consists BBO crystal dichroïc mirror. Pulse durations as short 12 ps are obtained. Temporal evolution pulse duration in train presented discussed.
Optical limiting performances of acid blue 29 are investigated under irradiation by a 35 mW continuous wave He-Ne laser.The optical behavior is using transmission measurement through samples with different concentrations.Our results show that the efficiency concentrations dependence.Induced self-diffraction patterns observed at relatively high intensities starting from 15 mW.
The spatial resolution in far-field mid-infrared (λ>2.5 µm) microscopy and micro-spectroscopy remains limited with the full-width at half maximum of point-spread function ca. λ/1.3; a value that is very poor comparison to commonly accessible visible near-infrared optics. Hereafter, it demonstrated however polymer beads are centre-to-centre spaced by λ/2.6 can be resolved mid-infrared. more than 2-fold improvement achieved exploiting newly constructed scanning microscope built around optical...
We have experimentally investigated the enhancement in spatial resolution by image subtraction mid-infrared central solid-immersion lens (c-SIL) microscopy. The exploits a first measured with c-SIL point-spread function (PSF) realized Gaussian beam and second optically patterned silicon π-step phase plate, to realize centrally hollow PSF. intense sides lobes both PSFs that are intrinsic SIL make conventional weighted methods inadequate. A spatial-domain filter kernel optimized match...