A5051987293- Glass properties and applications
- Luminescence Properties of Advanced Materials
- Photonic Crystals and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Photonic and Optical Devices
- Material Dynamics and Properties
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Semiconductor Lasers and Optical Devices
- Silicon Nanostructures and Photoluminescence
- Phase-change materials and chalcogenides
- Microfluidic and Bio-sensing Technologies
- Spectroscopy and Quantum Chemical Studies
- Photoacoustic and Ultrasonic Imaging
- Optical Imaging and Spectroscopy Techniques
- Innovative Energy Harvesting Technologies
- Mineralogy and Gemology Studies
- Optical Coherence Tomography Applications
- Cellular Mechanics and Interactions
- Advanced Sensor and Energy Harvesting Materials
- Mechanical and Optical Resonators
- Cultural Heritage Materials Analysis
- Acoustic Wave Phenomena Research
- Laser Material Processing Techniques
- Energy Harvesting in Wireless Networks
University of Perugia
2015-2025
University of Trento
2003-2013
Nello Carrara Institute of Applied Physics
2004
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2004
University of Padua
2004
Istituto Nazionale per la Fisica della Materia
2002
Innovative label-free microspectroscopy, which can simultaneously collect Brillouin and Raman signals, is used to characterize the viscoelastic properties chemical composition of living cells with sub-micrometric resolution. The unprecedented statistical accuracy data combined high-frequency resolution high contrast recently built experimental setup permits study single immersed in their buffer solution by contactless measurements. signal deconvoluted cell components, thereby revealing...
Abstract The process in which locally confined epithelial malignancies progressively evolve into invasive cancers is often promoted by unjamming, a phase transition from solid-like to liquid-like state, occurs various tissues. Whether this tissue-level mechanical impacts phenotypes during carcinoma progression remains unclear. Here we report that the large fluctuations cell density accompany unjamming result repeated deformations of cells and nuclei. This triggers cellular mechano-protective...
The huge number of electronic devices called the Internet Things requires miniaturized, autonomous and ecologically sustainable power sources. A viable way to these is by converting mechanical energy into electrical through electro-active materials. most promising widely used materials for harvesting are piezoelectric materials, where main one toxic or not biocompatible. In this work, we focus our attention on biocompatible harvesting. aim work facilitate expedite effort selecting best...
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.
In the ever-evolving landscape of modern agriculture, integration advanced technologies has become indispensable for optimizing crop management and ensuring sustainable food production. This paper presents development implementation a real-time AI-assisted push-broom hyperspectral system plant identification. The technique, coupled with artificial intelligence, offers unprecedented detail accuracy in monitoring. details design construction spectrometer, including optical assembly...
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...
This study concerns those crystallographic and microstructural features that can provide indications on the actual origin of red pigments based hematite (Fe 2 O 3 ). The main natural artificial are recalled used to discuss results obtained from characterization red‐ochre samples coming Palaeolithic site Riparo Dalmeri, a rock‐shelter located in northeastern Italy, dated 13 000 cal. bp , notorious for presence, among other finds, red‐painted calcareous stones. Painting treatment leather hides...
Brillouin spectroscopy has been used to study the vibrational dynamics of clusters spherical polystyrene (PS) particles with different size. In a first approximation, spectra can be described by single particle model within continuum approximation Lamb theory. The yields excellent results for diameter d ≳ 500 nm, but fails in accounting lineshapes observed lowest frequency signals vibration spectrum smaller due broadening and shift lines confined vibrations. also predict an additional very...
Recent advances in photonics technologies pushed optical microscopy toward new horizons materials characterization. In this framework, Brillouin emerged as an innovative method to provide images of with mechanical contrast without any physical contact, but exploiting the light-matter interaction. imaging holds great promise: allow analysis inside soft and heterogeneous materials, addressing pivotal role played by viscoelastic properties physiology pathology living tissues cells....
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,...
Brillouin light scattering (BLS) can record particle resonances, which allow access to thermomechanical properties on a submicrometer scale. The full theoretical representation of BLS eigenmode spectra polymer and silica colloids resolves longstanding discussion showing that both even odd l spheroidal modes are active. transparent suspensions fully support the predicted dependence strength individual resonance probing wavevector. It is this selects will be revealed experimentally.
Brillouin imaging is an emerging optical elastography technique that able to generate maps of the mechanical properties at microscale with great potential in biophysical and biomedical fields. A key parameter its spatial resolution, which usually identified confocal microscope coupled interferometer. Conversely, here we demonstrate mean free path acoustic phonons plays a major role defining especially for high numerical aperture setups. Surprisingly, resolution may even deteriorate when...
This work is focused on the preparation and multi-technique characterization of potentially biocompatible reactive interfaces obtained by combining layered double hydroxides (LDHs) hydroxyapatite (HA). Antimicrobial osteoinductive metallic ions as Zn2+ Ga3+ were chosen intralayer constituents LDH to obtain ZnAl ZnAlGa systems. These LDHs, exchanged with dihydrogenphosphate anions, promoted precipitation HA surface yielding HA@LDH composites. X-ray diffraction quantitative analysis, through...
Bone has a sophisticated architecture characterized by hierarchical organization, starting at the sub-micrometre level. Thus, analysis of mechanical and structural properties bone this scale is essential to understand relationship between its physiology, physical chemical composition. Here, we unveil potential Brillouin–Raman microspectroscopy (BRaMS), an emerging correlative optical approach that can simultaneously assess mechanics chemistry with micrometric resolution. Correlative...
Specifically designed samples have been analyzed to test the ability of Brillouin spectroscopy provide reliable mechanical characterization micro and nano-objects. The selected are polymeric films, whose transversal sizes from hundreds nano- some micro-meters cover entire range length-scales relevant in scattering process. experimental data highlight how, size extended collective oscillation (acoustic phonons, brief) is lowest spatial resolution reachable characterization. Conversely, limit...
Destruction of myelin internodes, oligodendrocyte (OL) apoptosis, and axonal degeneration characterize diseased or aged central nervous systems. While OLs can partially regenerate sheaths, the remyelination process ultimately fails. Tissue mechanical physical properties, such as stiffness curvature, play a role in this process. However, complexity existing models has hindered studies OL mechanobiology. Here, tissue-engineered model is presented to investigate impact diameter on myelination....
Abstract The ability to modulate the elastic properties of nanostructured objects is crucial for development innovative materials able control propagation acoustic waves (phonons) in hypersonic frequency regime, with applications ranging from acousto‐ thermo‐optical devices. Here, an advanced strategy explored finely tune Stöber silica microparticles, commonly used building blocks phononic materials. Using moderate electron beam energies a scanning microscope, controlled, huge and rapid...