A5051424432- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- 2D Materials and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Orbital Angular Momentum in Optics
- Photonic Crystals and Applications
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Nonlinear Optical Materials Studies
- Perovskite Materials and Applications
- Nanowire Synthesis and Applications
- Spectroscopy and Quantum Chemical Studies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Quantum Dots Synthesis And Properties
- Nanoparticle-Based Drug Delivery
- Chalcogenide Semiconductor Thin Films
- Graphene research and applications
- Terahertz technology and applications
- Nonlinear Optical Materials Research
- Advanced Antenna and Metasurface Technologies
- Nanocluster Synthesis and Applications
- Nanoplatforms for cancer theranostics
- Spectroscopy and Laser Applications
- Solar-Powered Water Purification Methods
Politecnico di Milano
2018-2023
Australian National University
2020-2023
ARC Centre of Excellence for Transformative Meta-Optical Systems
2021
Mylan (South Africa)
2020
We predict theoretically a regime of photon-pair generation driven by the interplay multiple bound states in continuum resonances nonlinear metasurfaces. This nondegenerate is derived from hyperbolic topology transverse phase matching and can enable orders-of-magnitude enhancement photon rate spectral brightness, as compared to degenerate regime. show through comprehensive simulations that entanglement pairs be tuned varying pump polarization, which underpin future advances applications...
We demonstrate optically tunable control of second-harmonic generation in all-dielectric nanoantennas: by using a beam that is absorbed the nanoresonator, we thermo-optically change refractive index radiating element to modulate amplitude signal. For moderate temperature increase roughly 40 K, modulation efficiency up 60% demonstrated; this large tunability single meta-atom response paves way exciting avenues for reconfigurable homogeneous and heterogeneous metasurfaces.
The enhancement of nonlinear optical effects via nanoscale engineering is a hot topic research. Optical nanoantennas increase light-matter interaction and provide, simultaneously, high throughput the generated harmonics in scattered light. However, optics has dealt so far with static or quasi-static configurations, whereas advanced applications would strongly benefit from high-speed reconfigurable nanophotonic devices. Here we propose experimentally demonstrate ultrafast all-optical...
Hot-electron dynamics taking place in nanostructured materials upon irradiation with fs-laser pulses has been the subject of intensive research, leading to emerging field ultrafast nanophotonics. However, most common description nonlinear interaction ultrashort laser assumes a homogeneous spatial distribution for photogenerated carriers. Here we theoretically show that inhomogeneous evolution hot carriers at nanoscale can disclose unprecedented opportunities diffraction management. In...
Significance Metal and semiconductor nanoparticles have been widely exploited in research, because of their striking capability to concentrate light energy at the nanoscale convert it heat ultrahigh speed. However, most are made homogeneous materials, which limits possibility engineer photothermal properties. Additional degrees freedom provided by nanoassemblies: periodically arranged nanocrystals few nanometers size embedded into an organic matrix. Here we display a specific mechanism...
Nanofabrication of flat optic silica gratings conformally layered with two-dimensional (2D) MoS2 is demonstrated over large area (cm2), achieving a strong amplification the photon absorption in active 2D layer. The anisotropic subwavelength induce highly ordered periodic modulation layer, promoting excitation Guided Mode Anomalies (GMA) at interfaces We show capability to achieve broadband tuning these lattice modes from visible (VIS) near-infrared (NIR) by simply tailoring illumination...
Abstract We reveal that strongly enhanced generation of photon pairs with narrow frequency spectra and sharp angular correlations can be realised through spontaneous parametric down-conversion in metasurfaces. This is facilitated by creating meta-gratings nano-structuring nonlinear films sub-wavelength thickness to support the extended bound state continuum resonances, associated ultra-high Q -factors, at biphoton wavelengths across a wide range emission angles. Such spectral features...
Abstract Hybrid plasmonic‐semiconductor assemblies are receiving considerable attention due to the possibility achieve hot‐carrier‐based photodetection. In this context, 2D transition metal dichalcogenides (TMDs) coupled nanostructures very promising. However, plasmon‐to‐TMD carrier injection process is extremely challenging and even reveal in a clear‐cut way. Herein, report of multiple transient absorption ultrafast measurements, with tunable pump excitation, enabling quantitative...
Abstract Plasmonic nanoparticles (NPs) are exploited to concentrate light, provide local heating and enhance drug release when coupled smart polymers. However, the role of NP assembling in these processes is poorly investigated, although their superior performance as nanoheaters has been theoretically predicted since a decade. Here we report on compound hydrogel (agarose carbomer 974P) loaded with gold NPs different configurations. We investigate dynamics light-heat conversion hybrid...
Flat optics photon harvesting, based on cm-scale MoS<sub>2</sub> nanostripe arrays, induces an ultra-broadband enhancement (≈400%) of optical absorption.
Bidirectional nanoantennas are of key relevance for advanced functionalities to be implemented at the nanoscale and, in particular, color routing an ultracompact flat-optics configuration. Here we demonstrate a novel approach avoiding complex collective geometries and/or restrictive morphological parameters based on cross-polarized detuned plasmonic uniaxial (quasi-1D) bimetallic The nanofabrication such system is controlled over large area (cm2) by self-organized technique exploiting...
The transient optical response of multiresonant all‐dielectric nanoantennas via a combination broadband ultrafast reflectivity experiments and nonlinear optics nanoscale modeling is studied. Ultrafast all‐optical control the demonstrated in variably sized over four distinct Mie resonances (including Fano‐like resonances), spanning broad spectral range, from red to near‐infrared. A spatially inhomogeneous dynamical model, which accounts for diffusion photogenerated carriers inside...
Plasmonic nanoparticles are renowned as efficient heaters due to their capability resonantly absorb and concentrate electromagnetic radiation, trigger excitation of highly energetic (hot) carriers, locally convert excess energy into heat via ultrafast nonradiative relaxation processes. Furthermore, in assembly configurations (i.e., suprastructures), collective effects can even enhance the heating performance. Here, we report on dynamics photothermal conversion related nonlinear optical...
We study the optical properties of an anisotropic ripple-shaped two-dimensional molybdenum disulfide (MoS2) nanosheet deposited by chemical vapor deposition onto a nanopatterned silica (SiO2) substrate. unveil giant response in linear and nonlinear regime combination extinction measurements, ultrafast broadband transient absorption experiments, finite element method numerical simulations. In steady state such anisotropy appears as polarization-dependent correspondence with characteristic...
Abstract A cost effective method to tailor the optical response of large‐area nanosheets 2D materials is described. reduced metalayer model introduced capture key‐role out‐of‐plane component dielectric tensor. Such a indicates that extinction can be strongly altered by controlling geometry at local (i.e., subwavelength) scale. In particular, giant linear dichroism normal incidence demonstrated, with major features around excitonic peaks, tailored acting on average curvature and slope...
We present a novel nonlinear metasurface featuring reconfigurable symmetry protected bound states in the continuum. It enhances photon-pair generation at non-degenerate photon frequencies via spontaneous parametric down-conversion, opening new opportunities for quantum spectroscopy and sensing.
Here the engineering of anisotropic plasmonic metasurfaces in form nanostripes or nanostripe dimers is demonstrated by a novel self-organization technique. Subwavelength quasi-1D glass templates are fabricated over large (cm2) area ion beam induced wrinkling, enabling maskless confinement out-of-plane tilted gold arrays supporting localized plasmon resonances easily tunable from Visible to Near-Infrared spectrum. A multi-step variant method allows achieve hybridization Au-silica-Au nanostrip...
Summary form only given. All-dielectric nanophotonics has recently raised an increasing interest because the optical response of high-permittivity dielectric nanoparticles exhibits negligible dissipative losses and strong magnetic multipole resonances in visible near-IR. We reported a second harmonic generation (SHG) conversion efficiency higher than 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-5</sup> at 2 = 1554 nm (pump intensity ≈ 1.6...
Summary form only given. During the last decade, photothermal properties of nanostructures have attracted an increasing interest for both fundamental and applied aspects, with potential impact on cancer therapy solar devices [1]. In particular, metal nanoparticles been widely exploited to absorb concentrate light energy at nanoscale, via plasmonic resonances. Most efforts in field dealt engineering individual nanoparticle configuration, from nanospheres nanorods, nanoshells, nanocages, etc....