A5056802280- Advanced Fiber Laser Technologies
- Quantum Mechanics and Non-Hermitian Physics
- X-ray Diffraction in Crystallography
- Photonic and Optical Devices
- Nonlinear Photonic Systems
- Spectroscopy and Quantum Chemical Studies
- Near-Field Optical Microscopy
- Random lasers and scattering media
- Quantum Information and Cryptography
- Photosynthetic Processes and Mechanisms
- Ion-surface interactions and analysis
- Photoacoustic and Ultrasonic Imaging
- Adsorption and biosorption for pollutant removal
- Spectroscopy and Laser Applications
- Photonic Crystals and Applications
- Light effects on plants
- Photoreceptor and optogenetics research
- Crystal Structures and Properties
- Membrane Separation Technologies
- Quantum optics and atomic interactions
- Advanced Fluorescence Microscopy Techniques
- Nanowire Synthesis and Applications
- Mechanical and Optical Resonators
- Nanomaterials for catalytic reactions
- Semiconductor Quantum Structures and Devices
University of Florence
2018-2024
University of Siena
2023-2024
Istituto Nazionale di Ricerca Metrologica
2024
European Theoretical Spectroscopy Facility
2023
Many of the most advanced applications semiconductor quantum dots (QDs) in information technology require a fine control QDs' position and confinement potential, which cannot be achieved with conventional growth techniques. Here, novel versatile approach for fabrication site-controlled QDs is presented. Hydrogen incorporation GaAsN results formation N-2H N-2H-H complexes, neutralize all effects N on GaAs, including N-induced large reduction bandgap energy. Starting from fully hydrogenated...
The fabrication of integrated quantum dot (QD)-optical microcavity systems is a requisite step for the realization wide range nanophotonic experiments (and applications) that exploit ability QDs to emit nonclassical light, e.g., single photons. Thanks their \ensuremath{\sim}20-nm positioning accuracy and proven potential single-photon operation, obtained by spatially selective hydrogen irradiation dilute-nitride semiconductors ---such as Ga(AsN) Ga(PN)---are uniquely suited integration with...
Spectroscopic applications are characterized by the constant effort to combine high spectral resolution with large bandwidth. A trade-off typically exists between these two aspects, but recent development of super-resolved spectroscopy techniques is bringing new opportunities into this field. This particularly relevant for all where compact and cost-effective instruments needed such as in sensing, quality control, environmental monitoring, or biometric authentication, name a few. These...
The application of parity–time (PT) symmetry in optics, especially PT-symmetry breaking, has attracted considerable attention as an approach to controlling light propagation. Here, we report optical limiting by two coupled cavities with a PT-symmetric spectrum reflectionless modes. is related broken PT due light-induced changes one the cavities. Our experimental implementation involves three-mirror resonator alternating layers ZnS and cryolite spectral degeneracy passive demonstrated...
Large scale simulations of light-matter interaction in natural photosynthetic antenna complexes containing more than one hundred thousands chlorophyll molecules, comparable with size, have been performed. Photosynthetic present Green sulfur bacteria and Purple analyzed using a radiative non-Hermitian Hamiltonian, well known the field quantum optics, instead widely used dipole-dipole Frenkel Hamiltonian. This approach allows to study ensembles emitters beyond small volume limit (system size...
We report optical limiting of single 532-nm 6-ns laser pulses by two coupled cavities with a PT-symmetric spectrum reflectionless modes at fluences above 10 mJ/cm 2 . The is related to broken PT symmetry due light-induced changes in one the cavities. At threshold, limiter quickly becomes highly reflective rather than absorbing, thereby protecting itself from laser-induced damage.
Large-scale simulations of light-matter interaction in natural photosynthetic antenna complexes containing more than one hundred thousands chlorophyll molecules, comparable with size, have been performed. Photosynthetic present Green sulfur bacteria and Purple analyzed using a radiative non-Hermitian Hamiltonian, well-known the field quantum optics, instead widely used dipole-dipole Frenkel Hamiltonian. This approach allows us to study ensembles emitters beyond small volume limit (system...
In powder diffraction, lattice symmetry relaxation causes a peak to split into several components which are not resolved if the degree of desymmetrization is small (pseudosymmetry). Here equations rule splitting elaborated for six minimal transitions, showing that resulting peaks generally broader and asymmetric, suffer an hkl -dependent displacement with respect high-symmetry parent peak. These results will be help in Rietveld refinement pseudosymmetric structures where exact interpretation...
The use of synthetic hydrogels in wastewater treatment represents a promising and scalable approach to achieving clean water. By modulation their chemical structure, can effectively remove wide range toxic compounds, including emerging organic pollutants heavy metals. For the latter, recovery is essential for both environmental protection metal recycling. increasing demand gold, nonrenewable widely used many technologies, calls methods its selective from complex cation solutions. This study...
The application of parity-time (PT) symmetry in optics, especially PT-symmetry breaking, has attracted considerable attention as a novel approach to controlling light propagation. Here, we report optical limiting by two coupled cavities with PT-symmetric spectrum reflectionless modes. is related broken PT due light-induced changes one the cavities. Our experimental implementation three-mirror resonator alternating layers ZnS and cryolite spectral degeneracy demonstrated measurements single...
Cryptomelane (2-xKx)[Mn8O16] is an octahedral molecular sieve with the hollanditeframework, a strongly correlated electron system tunnel structure. Rietveld refinementusing powder X-ray diffraction patterns of nanocrystalline sample was undertaken to assessboth structural and morphological details which might be tuned for specific applications. Thedistribution peak widths highly anisotropic but successful refinement tetragonalstructure could achieved assuming both grain shape microstrain...
In article number 1705450, Francesco Biccari and co-workers describe a novel versatile approach for the post-growth fabrication of site-controlled, single-photon-emitting quantum dots. This approach, which deploys hot spot near-field microscope to locally remove hydrogen from nanometer-sized regions standard GaAs/GaAsN:H/GaAs well, features state-of-the-art control over both nanostructure position (<100 nm) emission energy (≈20 meV).