282 citations · 747 across the 18 of their papers we have counts for
18 papers
Radially and azimuthally pure vortex beams from phase-amplitude metasurfaces
Michael de Oliveira, Marco Piccardo, Sahand Eslami +3
To exploit the full potential of the transverse spatial structure of light using the Laguerre-Gaussian basis, it is necessary to control the azimuthal and radial components of the…
Shapeshifting diffractive optical devices
S. L. Oscurato, F. Reda, M. Salvatore +3
In optical devices like diffraction gratings and Fresnel lenses, light wavefront is engineered through the structuring of device surface morphology, within thicknesses comparable t…
Optical vortex crystals with dynamic topologies
Marco Piccardo, Michael de Oliveira, Andrea Toma +3
Vortex crystals are geometric arrays of vortices found in various physics fields, owing their regular internal structure to mutual interactions within a spatially confined system.…
Roadmap on multimode light shaping
Marco Piccardo, Vincent Ginis, Andrew Forbes +35
Our ability to generate new distributions of light has been remarkably enhanced in recent years. At the most fundamental level, these light patterns are obtained by ingeniously com…
Recent twists in twisted light: A perspective on optical vortices from dielectric metasurfaces
Marco Piccardo, Antonio Ambrosio
Optical vortices are the electromagnetic analogue of fluid vortices studied in hydrodynamics. In both cases the traveling wavefront, either made of light or fluid, is twisted like…
Arbitrary polarization conversion for pure vortex generation with a single metasurface
Marco Piccardo, Antonio Ambrosio
The purity of an optical vortex beam depends on the spread of its energy among different azimuthal and radial modes. The smaller is this spread, the higher is the vortex purity and…
Polariton Nanophotonics using Phase Change Materials
Kundan Chaudhary, Michele Tamagnone, Xinghui Yin +14
Polaritons formed by the coupling of light and material excitations such as plasmons, phonons, or excitons enable light-matter interactions at the nanoscale beyond what is currentl…
High quality factor polariton resonators using van der Waals materials
Michele Tamagnone, Kundan Chaudhary, Christina M. Spaegele +6
We present high quality factor optical nanoresonators operating in the mid-IR to far-IR based on phonon polaritons in van der Waals materials. The nanoresonators are disks patterne…
A mid-infrared biaxial hyperbolic van der Waals crystal
Zebo Zheng, Ningsheng Xu, Stefano Luigi Oscurato +10
Hyperbolic media have attracted much attention in the photonics community, thanks to their ability to confine light to arbitrarily small volumes and to their use for super-resoluti…
Engineering Phonon Polaritons in van der Waals Heterostructures to Enhance In-Plane Optical Anisotropy
Kundan Chaudhary, Michele Tamagnone, Mehdi Rezaee +4
Van der Waals heterostructures assembled from layers of 2D materials have attracted considerable interest due to their novel optical and electrical properties. Here we report a sca…
Anisotropic Surface Plasmon Polariton Generation Using Bimodal V-Antenna Based Metastructures
Daniel Wintz, Antonio Ambrosio, Alexander Y. Zhu +2
V-shaped nanoantennas are among the popular choices for the unit element of a metasurface, a nanostructured surface used for its ability to mold and control the wavefront of light.…
Selective excitation and imaging of ultraslow phonon polaritons in thin hexagonal boron nitride crystals
Antonio Ambrosio, Michele Tamagnone, Kundan Chaudhary +4
Polaritons in 2D and van der Waals (vdW) materials have been investigated in several recent works as an innovative platform for light-matter interaction, rich of new physical pheno…
Guided Modes of Anisotropic van der Waals Materials Investigated by Near-Field Scanning Optical Microscopy
Daniel Wintz, Kundan Chaudhary, Ke Wang +11
Guided modes in anisotropic two-dimensional van der Waals materials are experimentally investigated and their refractive indices in visible wavelengths are extracted. Our method in…
Mechanical detection and imaging of hyperbolic phonon polaritons in hexagonal Boron Nitride
Antonio Ambrosio, Luis A. Jauregui, Siyan Dai +7
Mid-infrared nano-imaging and spectroscopy of two-dimensional (2D) materials have been limited so far to scattering-type Scanning Near-field Optical Microscopy (s-NSOM) experiments…
Spin-to-orbital angular momentum conversion in dielectric metasurfaces
Robert Charles Devlin, Antonio Ambrosio, Daniel Wintz +6
Spin-to-orbital-angular-momentum conversion has attracted considerable interest as a tool to create exotic light beams, leading to the emergence of novel devices that implement thi…
Dispersion-compensated meta-holograms based on detour phase
Mohammadreza Khorasaninejad, Antonio Ambrosio, Pritpal Kanhaiya +1
Subwavelength structured surfaces, known as metasurfaces, hold promise for future compact and optically thin devices with versatile functionalities. Here, by revisiting the concept…
Holographic patterning of graphene-oxide films by light-driven reduction
Emanuele Orabona, Antonio Ambrosio, Angela Longo +3
We report on the patterning and reduction of graphene-oxide films by holographic lithography. Light reduction can be used to engineer low-cost graphene-based devices by performing…
Light-induced spiral mass transport in azo-polymer films under vortex-beam illumination
Antonio Ambrosio, Lorenzo Marrucci, Fabio Borbone +2
When an azobenzene-containing polymer film is exposed to a non-uniform illumination, a light-induced mass migration process may be induced, leading to the formation of relief patte…