A5061522093- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- 2D Materials and Applications
- Cosmology and Gravitation Theories
- High-pressure geophysics and materials
- Gold and Silver Nanoparticles Synthesis and Applications
- Geophysics and Sensor Technology
- Plasmonic and Surface Plasmon Research
- nanoparticles nucleation surface interactions
- Perovskite Materials and Applications
- Graphene research and applications
- Advanced Frequency and Time Standards
- Chalcogenide Semiconductor Thin Films
- Radio Astronomy Observations and Technology
- Advanced Fiber Optic Sensors
- Optical Coatings and Gratings
- Dark Matter and Cosmic Phenomena
- MXene and MAX Phase Materials
- Magnetic confinement fusion research
- Atomic and Subatomic Physics Research
- Molecular Junctions and Nanostructures
- Cold Atom Physics and Bose-Einstein Condensates
- Mechanical and Optical Resonators
University of Genoa
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2017-2025
Superconducting and other Innovative Materials and Devices Institute
2024
Polytechnic University of Turin
2024
Lawrence Berkeley National Laboratory
2024
Italian Institute of Technology
2024
Université Paris Cité
2023
Laboratoire AstroParticule et Cosmologie
2023
Centre National de la Recherche Scientifique
2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2017
Abstract Two‐dimensional transition metal dichalcogenides (2D TMDCs) have gained significant attention from the scientific community due to their exceptional properties. Recently, metal‐assisted exfoliation technique has emerged as a promising method for producing large‐area, high‐quality 2D monolayers. However, achieving strong adhesion between foil and substrate during process remains major challenge, preventing successful exfoliation. To overcome this issue, study explores application of...
This work reports an electronic and micro-structural study of appealing system for optoelectronics: tungsten disulphide (WS<sub>2</sub>) on epitaxial graphene (EG) SiC(0001).
Ellipsometry of hot gold nanoparticles reveals deviations their optical properties from expectations due to temperature-induced surface effects.
Excitons dominate the light absorption and re-emission spectra of monolayer transition-metal dichalcogenides (TMD). Microscopic investigations excitonic response in TMD almost invariably extract information from radiative recombination step, which only constitutes one part picture. Here, by exploiting imaging spectroscopic ellipsometry (ISE), we investigate spatial dependence dielectric function chemical vapor deposition (CVD)-grown WS2 flakes with a microscopic lateral resolution, thus...
We report the room-temperature, low-voltage-enabled modulation of optical response hybrid transparent-conductive-oxide/ferroelectric multilayers in infrared spectral range. have fabricated an multilayer consisting Al-doped ZnO (AZO)...
In current and future gravitational‐wave detectors, thermal noise from mirror coatings limits the sensitivity of detectors. To reduce coating noise, with excellent optical mechanical properties are needed. this review, an overview postdeposition treatments latest worldwide research activities on low loss absorption reported. A brief design optimization, including innovative solutions such as multimaterial nanolayers, is also discussed.
Interference reflection microscopy (IRM) and backside absorbing layer (BALM) have emerged as powerful optical methods for the study of nanomaterials biological samples. These techniques consist in using an inverted microscope mode to observe objects deposited either on glass or a nanometric metallic film (BALM). The thickness BALM optional additional transparent layers, well choice incident wavelength top medium, act levers maximizing resultant contrast given sample. However, use samples...
Silver is an extremely appealing metal for plasmonics due to its very low optical losses in the visible and near-ultraviolet range relatively reactivity. Within emerging field of thermoplasmonics, where light-metal interactions are exploited generate heat on nanometric scale, knowledge temperature-dependent complex permittivities plasmonic materials indispensable. We extracted permittivity silver ${\ensuremath{\varepsilon}}_{Ag}$ by spectroscopic ellipsometry under high-vacuum conditions....
Incorporation of responsive elements into photonic crystals is an effective strategy for building up active optical components to be used as sensors, actuators and modulators. In these regards, Tamm Plasmon (TP) modes have arisen recently powerful tools the manipulation light-matter interaction sensors/actuators. These emerge at interface between a dielectric mirror plasmonic layer and, interestingly, can excited normal incidence angle with relatively high quality factors. Although its field...
We investigated the effects of ultrafast laser excitation Au nanoparticles (NPs) having strong interparticle electromagnetic coupling by irradiating NPs either at interband or plasmon-resonance wavelengths (13–100 J/m2 fluence regime). observed that is significantly more efficient than plasmonic in reshaping, coalescing, and ultimately sublimating NPs, despite light-absorption cross section being almost half irradiation. ascribed this to different localizations radiation-induced heat sources...
The excitation of plasmonic nanoparticles by ultrashort laser pulses sets in motion a complex ultrafast relaxation process involving the gradual re-equilibration system's electron gas, lattice, and environment. One major hurdles studying these processes is lack direct measurements dynamic temperature evolution system subcomponents. We measured optical response ensembles Au following ultra-short-pulse excitation, we compared it with corresponding static as function increasing thermodynamic...
We investigated the temperature-dependent optical response of ordered lattices noninteracting gold-core/poly(N-isopropylacrylamide)-shell nanoparticles (NPs), a system with proven photothermal and sensing capabilities. For first time on this system, we exploited in situ spectroscopic ellipsometry (SE) to determine complex, properties lattice—a key piece information which, however, is often overlooked. In doing so, took full advantage large-scale colloidal self-assembly, which makes NP...
Amorphous mixed titania-tantala coatings are key components of Bragg reflectors in gravitational-wave detectors (GWDs). Attaining the lowest possible values optical absorption and mechanical losses is paramount importance for GWDs, this requires a complex optimization coating deposition postdeposition annealing. We present here systematic investigation properties internal friction amorphous grown by ion beam sputtering. consider with six different cation mixing ratios─defined as Ti/(Ti +...
Abstract The study of nonthermal electrons, generated upon photoexcitation plasmonic nanostructures, plays a key role in variety contexts, from photocatalysis and energy conversion to photodetection nonlinear optics. Their ultrafast relaxation subsequent release low distribution thermalized hot electrons has been the subject myriad papers, mostly based on femtosecond transient absorption spectroscopy (FTAS). However, FTAS signal stems complex interplay different contributions arising both...
In recent years, metamaterials have emerged as a crucial technology for designing sub-wavelength thick optical components capable of performing various functions. Among the others, these nanostructures could be employed to tune refractive index, making them useful in fields (from optoelectronic applications gravitational wave detectors). this work, nanostratified structures composed alternating layers silica (SiO2) and titania (TiO2) were proposed fabricated using plasma-assisted electron...
Abstract Anti‐reflective surfaces are of great interest for optical devices, sensing, photovoltaics, and photocatalysis. However, most the anti‐reflective lack in situ tunability extinction with respect to wavelength. This communication demonstrates a tunable surface based on colloidal particles comprising metal core an electrochromic polymer shell. Random deposition these reflective results decrease reflectance up 99.8% at localized plasmon resonance frequency. narrow band feature can be...
Heterostacks composed of two-dimensional WS2 and graphene exhibit interesting opto-electronic properties, including ultrafast charge transfer fast, efficient photodetection. The optical properties are heavily influenced by the presence in heterostack, yet, so far, their characterization whole visible range is missing. In this work we report complex dielectric function flakes on epitaxial silicon carbide, obtained means spectroscopic ellipsometry (SE). so-called A, B C excitonic features...
We present temperature-dependent (from room temperature to 80 °C) absorption spectra of Au/SiO2 core-shell nanoparticles (NPs) (core diameter: ∼25 nm) in water the range from 1.5 4.5 eV, which spans localized surface plasmon resonance (LSPR) and interband transitions. A decrease with over entire spectral is observed, more prominent at LSPR. These changes are well reproduced by theoretical calculations spectra, based on experimentally measured real (ε1) imaginary (ε2) parts dielectric...