A5025291204- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Nanocluster Synthesis and Applications
- Nonlinear Optical Materials Studies
- Carbon and Quantum Dots Applications
- Luminescence Properties of Advanced Materials
- Photonic Crystals and Applications
- Silicon Nanostructures and Photoluminescence
- Copper-based nanomaterials and applications
- nanoparticles nucleation surface interactions
- Advanced Photocatalysis Techniques
- Catalytic Processes in Materials Science
- Metamaterials and Metasurfaces Applications
- TiO2 Photocatalysis and Solar Cells
- Gas Sensing Nanomaterials and Sensors
- Magnetic properties of thin films
- Photonic and Optical Devices
- Glass properties and applications
- Transition Metal Oxide Nanomaterials
- Advanced biosensing and bioanalysis techniques
- Lanthanide and Transition Metal Complexes
- Water Quality Monitoring and Analysis
- Electrochemical Analysis and Applications
- Electrohydrodynamics and Fluid Dynamics
University of Padua
2015-2024
National Interuniversity Consortium for the Physical Sciences of Matter
2012-2022
Institute of Ionized Gas
2015-2020
In the quest for new and increasingly efficient photon sources, engineering of photonic environment at subwavelength scale is fundamental controlling properties quantum emitters. A high refractive index particle can be exploited to enhance optical nearby emitters without decreasing their efficiency, but relatively modest Q-factors (Q ∼ 5-10) limit local density states (LDOS) amplification achievable. On other hand, ultrahigh (up Q 109) have been reported quasi-BIC modes in all-dielectric...
The nonlinear absorption properties of bidimensional arrays Au-Ag bilayered nanoprisms have been investigated by z-scan measurements as a function the bimetallic nanoprism composition. A tunable ps laser system was used to excite ultrafast, electronic response matching wavelength with quadrupolar surface plasmon resonances, in visible range, each array. Due strong electromagnetic field confinement effects at tips, demonstrated finite element method simulations, these nanosystems proved...
The aim of this work is to present a potential application gallium nitride-based optoelectronic devices. By using laser diode and photodetector, we designed demonstrated free-space compact lightweight wireless power transfer system, whose efficiency limited by the receiver. We analyzed effect electrical load, temperature, partial absorption optical excitation distribution on efficiency, identifying heating band-filling as most impactful processes. comparing final demonstrator with commercial...
(Au–Ag)<sub>N</sub>nanoalloy clusters made up of<italic>N</italic>= 10–15 atoms increase by an order of magnitude the room temperature photoemission intensity Er<sup>3+</sup>in silica, better than monometallic Au<sub>N</sub>clusters same size.
The ultra-fast dynamics of the nonlinear optical response Ag nanoprism arrays is investigated by <italic>z</italic>-scan and excite–probe techniques.
The control of the spontaneous emission properties quantum emitters with limited losses by near-field coupling plasmons-supporting nanostructures is one keys for next-generation high-efficiency and high-coherence plasmonic devices. In present work, gold nanohole arrays are demonstrated to be an effective system controlling radiative rate efficiency 1540 nm Er3+ ions embedded in silica. Finite element method electrodynamic simulations were used describe interaction between dipolar arrays....
Ultra-small molecule-like AuN nanoclusters made by a number of atoms N less than 30 were produced ion implantation in silica substrates. Their room temperature photoluminescence properties the visible and near-infrared range have been investigated correlated with Er sensitization effects observed Er–Au co-implanted samples. The intense emission under 488 nm laser excitation occurs three different spectral regions around 750 (band A), 980 B) 1150 C) as consequence formation discrete energy...
Ordered metallic nanoprism arrays have been proposed as novel and versatile systems for the observation of nonlinear effects such absorption. The study effect local field reinforcement on fast optical third order response around Surface Plasmon Resonance is great interest many plasmonic applications. In this work, silver synthesized by nanosphere lithography method. A low repetition rate tunable picosecond laser source was used to irradiance wavelength dependence absorption properties...
We study, both experimentally and theoretically, the modification of ${\mathrm{Er}}^{3+}$ photoluminescence properties in $\mathrm{Si}$ dielectric nanoslots. The ultrathin nanoslot (down to 5-nm thickness), filled with $\mathrm{Er}$ ${\mathrm{Si}\mathrm{O}}_{2}$, boosts electric magnetic local density states via coherent near-field interaction. report an experimental 20-fold enhancement radiative decay rate negligible losses. Moreover, modifying geometry all-dielectric nanoslot, outcoupling...
The dichroic nonlinear absorption of Ag nanoprism arrays is interpreted using FEM simulations the polarization-dependent local electric field distribution.
To unveil the mechanisms of energy transfer between AuN nanostructures and Er3+ ions in silica is paramount importance for possible use Au molecular clusters as sensitizing agents rare-earth luminescence photonic devices. In present work a phenomenological model was developed that allowed us to estimate most important photophysical parameters sensitization cross-section, fraction sensitized Er ions, coupling distance transfer. The results demonstrate spite very large cross-sections (more...
The possibility to control the room temperature Er 3+ photoluminescence efficiency in silica is investigated terms of damage produced Er-doped by implantations at different fluences with Xe or Au ions.These are tailored reproduce same level silica.The remarkable differences intensity between Xe-and Au-irradiated samples allowed decouple detrimental effect implantation on from beneficial broad-band energy transfer process provided molecule-like clusters formed upon thermal annealing.The...
Rare-earth ions sensitization is, nowadays, a relevant topic in modern technologies. Noble metal nanoclusters can effectively sensitize lanthanide photoluminecence (PL) via excitation energy transfer (EET). Recent experimental works reported how this process strongly depends on the size and composition, however, comprehensive understanding of phenomenon is still lacking. Inspired by current paradigm lanthanide–antenna complexes, where light absorbed organic ligand, which then converts to...
The very early steps of Au metal cluster formation in Er-doped silica have been investigated by high-energy resolution fluorescence-detected X-ray absorption spectroscopy (HERFD-XAS). A combined analysis the near-edge and extended part experimental spectra shows that nucleation starts from a few O atoms covalently interconnected, likely presence embryonic Au-Au correlation. first clusters, characterized well defined coordination distance, form upon 400 °C inert annealing. estimated upper...
The variation of local density states and/or excitation surface plasmons in proximity a metal can be used to control the emission rate Er-doped materials for optical and optoelectronic devices. In present work we studied modification radiative lifetime Er3+ ions incorporated silica layers by magnetron cosputtering, due interaction with (Ag, Au, Ti, Cr) semiconductor (Si) thin films. Photoluminescence measurements have shown both cases strong decrease erbium transition at 1540 nm clear...
Cobalt oxide nanopetals were grown on silicon electrodes by heat-treating metallic cobalt films deposited DC magnetron sputtering. We show that oxide, with this peculiar nanostructure, is active towards the photo-electrochemical oxidation of water as well organic molecules, and its electrochemical properties are directly linked to structure surface. The formation Co3O4 nanopetals, induced oxidizing annealing at 300 °C, considerably improves performance material respect simple films....
Au<sub>N</sub>quantum cluster sensitization of Er<sup>3+</sup>photoemission in silica is boosted by H passivation Si dangling bonds around the clusters.
Sub-nanometric Au nanoclusters are known to act as very efficient sensitizers for the luminescent emission of Er(3+) ions in silica through a non-resonant broad-band energy-transfer mechanism. In present work process is investigated detail by room temperature photoluminescence characterization Er and co-implanted systems which different degree coupling between obtained. The results allow us definitely demonstrate short-range nature interaction agreement with non-radiative mechanisms....