A5060367027- Glass properties and applications
- Thermography and Photoacoustic Techniques
- Luminescence Properties of Advanced Materials
- Photoacoustic and Ultrasonic Imaging
- Laser Material Processing Techniques
- Phase-change materials and chalcogenides
- Photorefractive and Nonlinear Optics
- Solid State Laser Technologies
- Silicon Nanostructures and Photoluminescence
- Photodynamic Therapy Research Studies
- Chalcogenide Semiconductor Thin Films
- Nonlinear Optical Materials Studies
- Thin-Film Transistor Technologies
- Nuclear materials and radiation effects
- TiO2 Photocatalysis and Solar Cells
- Advanced Sensor Technologies Research
- Calibration and Measurement Techniques
- Spectroscopy and Quantum Chemical Studies
- Electrospun Nanofibers in Biomedical Applications
- thermodynamics and calorimetric analyses
- Thermal properties of materials
- Transition Metal Oxide Nanomaterials
- Radiation Shielding Materials Analysis
- Advanced Sensor and Energy Harvesting Materials
- Mechanical and Optical Resonators
Universidade Estadual de Maringá
2015-2024
Universidade de São Paulo
2018-2023
National Research Council Canada
2022
Utah State University
2015-2016
University of Ljubljana
2016
Coordenação de Aperfeicoamento de Pessoal de Nível Superior
2015
Ministry of Education
2015
Eosin Y is known to be a powerful probe of biological molecules and an efficient photosensitizing agent for the production singlet molecular oxygen. Under continuous laser excitation, degradation through photobleaching observed in aqueous solutions eosin Y; this process driven by Optical bleaching yield anomalous thermal lens transient signals, which can evaluated modeling relaxation processes that give rise generation heat solution. A model describing signal derived applied investigate at...
The finite-size effect on the thermal mirror (TM) experiments is described. time-resolved thermoelastic deformation equation solved and compared to semi-infinite solution. To determine applicability of model, were performed in optical glasses quantitative results both models. analytical presented here found be excellent agreement with numerical finite elemental analysis model. Modeling experiment showed that TM transient signal strongly affected as sample thickness reduced. model demonstrate...
A theoretical and experimental study taking sample-fluid heat coupling into account in time-resolved photothermal mirror experiments is presented. Thermoelastic equations were solved to obtain a semi-analytical solution the phase shift induced by sample surrounding fluid. The was used model thermal effects found be excellent agreement with finite element method analysis experiment. Heat transferred air-coupling fluid did not introduce important when compared obtained, without considering...
Abstract We induce nanometer-scale surface deformation by exploiting momentum conservation of the interaction between laser light and dielectric liquids. The effect radiation force at air-liquid interface is quantitatively assessed for fluids with different density, viscosity tension. imparted pressure on liquids continuous or pulsed excitation fully described Helmholtz electromagnetic density.
The time-resolved thermal mirror technique is developed under pulsed laser excitation for quantitative measurement of and mechanical properties opaque materials. Heat diffusion thermoelastic equations are solved analytically assuming surface absorption an instantaneous pulse. Analytical results the temperature change displacement in sample compared to all-numerical solutions using finite element method analysis accounting pulse width geometry. Experiments performed that validate theoretical...
Noble metal embedded glasses have been studied as promising candidates for a variety of technological applications, mainly due to their ability enhance rare earth luminescence properties. In this work, Ag:Eu-co-doped calcium boroaluminate were prepared and submitted further heat treatment form different Ag species. The optical properties investigated in terms times. Absorption spectra showed successful Eu ion incorporation the host, well nanoparticle precipitation induced by treatment. Upon...
Thermal lens (TL) is a key effect in laser engineering and photothermal spectroscopy. The amplitude of the TL signal or its dioptric power proportional to optical path difference (OPD) between center border beam, which heat (Ph). Due thermally induced mechanical stress bulging end faces sample, OPD depends critically on geometry sample. In this investigation, measurements were performed as function sample length keeping same Ph. It experimentally demonstrated that for materials with positive...
We present semi-analytical solutions describing the spatiotemporal distributions of temperature and pressure inside low-absorbing dielectrics excited by tightly focused laser beams. These are compared to measurements in water associated with variations local refractive index due acoustic waves generated electrostriction, heat deposition, Kerr effect at different temperatures. The experimental results exhibited an excellent agreement modeling predictions, electrostriction being dominant...
Resonant excited state absorption (ESA) and relaxation processes in Tb(3+)-doped aluminosilicate glasses are quantitatively evaluated. A model describing the excitation steps upconversion emission is developed applied to interpret results from laser-induced surface deformation using thermal mirror spectroscopy. The fluorescence quantum efficiency of level (5)D(4) was found be close unity concentration independent while, for (5)D(3), it decreases with Tb(3+) concentration. Emission...
A theoretical model for a time-resolved photothermal mirror technique using pulsed-laser excitation was developed low absorption samples. Analytical solutions to the temperature and thermoelastic deformation equations are found three characteristic pulse profiles compared finite element analysis methods results An analytical expression intensity of center continuous probe laser at detector plane is derived Fresnel diffraction theory, which allows modeling experimental results. Experiments...
Among the glassy materials, tellurite glasses exhibit low phonon energy (∼780 cm−1), good mechanical stability, chemical durability, and high linear nonlinear refractive indices, with a wide transmission window (typically 0.4–6.0 μm), which make them promising materials for photonic applications. In this work, tungsten–zirconium–tellurite doped several Tb3+ concentrations (0.1–4.0 mol. % Tb2O3) were prepared characterized through absorption, emission, excitation spectra fluorescence decay...