A5062244011- Photonic and Optical Devices
- Photonic Crystals and Applications
- Glass properties and applications
- Luminescence Properties of Advanced Materials
- Silicon Nanostructures and Photoluminescence
- Photorefractive and Nonlinear Optics
- Semiconductor Lasers and Optical Devices
- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Optical Coatings and Gratings
- Advanced Fiber Optic Sensors
- Semiconductor materials and devices
- Nonlinear Optical Materials Studies
- Quantum Dots Synthesis And Properties
- Thin-Film Transistor Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Mechanical and Optical Resonators
- Laser Material Processing Techniques
- Diamond and Carbon-based Materials Research
- Photonic Crystal and Fiber Optics
- Analytical Chemistry and Sensors
- Gas Sensing Nanomaterials and Sensors
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced ceramic materials synthesis
- Lanthanide and Transition Metal Complexes
Istituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And Applications
2014-2023
Istituto di Fotonica e Nanotecnologie
2011-2022
Fondazione Bruno Kessler
2018-2022
Center for Biomolecular Nanotechnologies
2005-2021
National Research Tomsk State University
2021
Tomsk Polytechnic University
2021
National Research Council
2007-2021
Université d'Angers
2019
College Track
2019
Fotonica (Brazil)
2008-2018
Abstract Whispering‐gallery modes (WGM) on a spherical surface were first described by Lord Rayleigh at the beginning of last century, but only after invention laser did they start to have some scientific relevance and during two decades there has been substantial move towards real devices practical applications. WGM resonators peculiar properties, most notable being potential having an ultrahigh quality factor Q, which makes them very appealing both as cavities extremely sensitive sensors....
Despite the unquestionable empirical success of quantum theory, witnessed by recent uprising technologies, debate on how to reconcile theory with macroscopic classical world is still open. Spontaneous collapse models are one few testable solutions so far proposed. In particular, continuous spontaneous localization (CSL) model has become subject intense experimental research. Experiments looking for universal force noise predicted CSL in ultrasensitive mechanical resonators have recently set...
The photoluminescence properties of a silicate glass coactivated with silver and erbium ions were studied. Absorption spectra allowed to distinguish in the glasses several active species related silver, whose ratio depends on heat treatment concentration. broad emission visible region spectrum has been studied correlation nonresonant excitation ions. comparison shows that are excited through radiative nonradiative energy transfer from small aggregates.
70SiO 2 – 30HfO planar waveguides, doped with Er3+ concentrations ranging from 0.3 to 1 mol %, were prepared by sol-gel route, using dip-coating deposition on silica glass substrates. The waveguides show high densification degree, effective intermingling of the two components film, and uniform surface morphology. Propagation losses about dB/cm measured at 632.8 nm. When pumped 987 or 514.5 nm continuous-wave laser light, I413/2→I415/2 emission band a bandwidth 48 spectral features are found...
Abstract A reproducible route for the preparation of high‐quality CdSe–ZnS‐doped titania and zirconia waveguides is presented. The optical properties resultant composite materials are found to be sensitive semiconducting host matrix. Titania‐based composites seen inherently photounstable because photoelectron injection into bulk matrix subsequent nanocrystal (NC) oxidation. In comparison, significantly more robust with high photoluminescence (PL) retained annealing temperatures up 300 °C....
Rare earth-activated 1-D photonic crystals were fabricated by RF-sputtering technique. The cavity is constituted an Er3+-doped SiO2 active layer inserted between two Bragg reflectors consisting of ten pairs SiO2/TiO2 layers. Scanning electron microscopy employed to put in evidence the quality sample, homogeneities layers thickness and good adhesion among them. Near infrared transmittance variable angle reflectance spectra confirm presence a stop band from 1500 nm 2000 with resonance centered...
The lack of long-range structural order in amorphous solids induces well known thermodynamic anomalies, which are the manifestation distinct peculiarities vibrational spectrum. Although impact such anomalies vanishes long wavelength, elastic continuum limit, it dominates at length scales comparable to interatomic distances, implying an intermediate transition regime still poorly understood. Here we report a study mesoscopic domains by means broadband version picosecond photo-acoustics,...
Abstract Low wavenumber Raman scattering of the acoustic vibrational modes nanoparticles was used for determination size distribution free dielectric and semiconductor embedded in matrices. The theoretical background as well experimental results noninteracting strong interaction with a surrounding matrix is described. approach based on 1/ν dependence light‐to‐vibration coupling coefficient fact that each nanocrystallite diameter D vibrates its eigenfrequency ν ∼ 1/ . model calculation...
We report on the sol-gel fabrication and characterization of (100−x)SiO2–xSnO2 (x=8, 16, 25mol%) glass-ceramic waveguides doped with 1mol% Eu3+. A suitable top-down thermal process led to formation SnO2 nanocrystals ∼4nm embedding Eu3+ ions. The excitation spectra evidence role interband electronic transition luminescence Monitoring D05→F27 emission, we observe about 15 times increase in intensity absorption band, moving from x=8to25mol%. These also exhibit low losses, making them quite...
Oxidized multiwalled carbon nanotubes were produced by strong acid treatment with the aid of sonication. Short-length obtained filtration oxidized analyzed means X-ray photoelectron spectroscopy, Raman and photoluminescence spectroscopies, scanning electron microscopy. Direct evidence modifications electronic properties was valence band analysis. The oxidation induced led to deep changes density states. Analysis spectra showed that short are luminescent in visible range. Interestingly,...
Germanium (Ge) nanoparticles (NPs) are synthesized by means of pulsed laser ablation bulk germanium target immersed in acetone with ns pulses at different pulse energies. The fabricated NPs characterized employing techniques such as UV-visible absorption spectroscopy, photoluminescence, micro-Raman transmission electron microscopy (TEM) and field emission scanning (FESEM). mean size the Ge is found to vary from few nm 40 increase energy. Shift position spectra observed also photoluminescence...
The 1.5 μm fluorescence shape and lifetime of Er3 + -activated tellurite glasses have been investigated. measures on bulk system compared with those obtained powders, showing that the self-absorption effect broadens emission spectrum lengthens lifetime. It has demonstrated bandwidth measurements depend absorption coefficient α(λ) distance d between focused exciting laser beam exit face a glass sample. actual reconstructed from α(λ)·d knowledge. Lifetime lengthening cannot be determined and,...
A low-loss optical erbium activated silica-hafnia glass-ceramic planar waveguide was fabricated using a bottom-up approach. Hafnia nanoparticles were first prepared by colloidal route and then mixed in silica-hafnia:Er3+ sol. The resulting sol deposited on SiO2 substrate. Analysis of the photoluminescence has demonstrated that ions are embedded crystalline phase. lifetime enhancement I13∕24 metastable level observed. Losses measurements at 1542nm highlight very low attenuation coefficient...