279 citations · 1.8k across the 32 of their papers we have counts for
33 papers
Spatiotemporal Metasurface for Ultrafast All-Optical Wavefront Shaping
Mert Akturk, Giulia Crotti, Andrea Schirato +6
Optical metasurfaces have established themselves as exceptional nanophotonic platforms to control the properties of light at subwavelength scales. By properly designing the geometr…
Directional coupling to a nano-waveguide
Alessandro Tuniz, Sabrina Garattoni, Han-Hao Cheng +1
Silicon-based micro-devices are considered promising candidates for consolidating several terahertz technologies into a common and practical platform. The practicality stems from t…
Resonant Fully dielectric metasurfaces for ultrafast Terahertz pulse generation
Luke Peters, Davide Rocco, Luana Olivieri +11
Metasurfaces represent a new frontier in materials science paving for unprecedented methods of controlling electromagnetic waves, with a range of applications spanning from sensing…
Ultrafast all-optical second harmonic wavefront shaping
A. Sinelnik, S. H. Lam, F. Coviello +6
Optical communication can be revolutionized by encoding data into the orbital angular momentum of light beams. However, state-of-the-art approaches for dynamic control of complex o…
All-optical Reconfiguration of Ultrafast Dichroism in Gold Metasurfaces
Andrea Schirato, Andrea Toma, Remo Proietti Zaccaria +4
Optical metasurfaces have come into the spotlight as a promising platform for light manipulation at the nanoscale, including ultrafast all-optical control via excitation with femto…
Thermometric Calibration of the Ultrafast Relaxation Dynamics in Plasmonic Au Nanoparticles
Marzia Ferrera, Giuseppe Della Valle, Maria Sygletou +8
The excitation of plasmonic nanoparticles by ultrashort laser pulses sets in motion a complex ultrafast relaxation process involving the gradual re-equilibration of the system's el…
Transient optical symmetry breaking for ultrafast broadband dichroism in plasmonic metasurfaces
Andrea Schirato, Margherita Maiuri, Andrea Toma +7
Ultrafast nanophotonics is an emerging research field aimed at the development of nanodevices capable of light modulation with unprecedented speed. A promising approach exploits th…
One-dimensional disordered photonic structures with two or more materials
Alessandro Chiasera, Luigino Criante, Stefano Varas +9
Here we would like to discuss the light transmission modulation by periodic and disordered one dimensional (1D) photonic structures. In particular, we will present some theoretical…
Non-Hermitian transparency and one-way transport in low-dimensional lattices by an imaginary gauge field
Stefano Longhi, Davide Gatti, Giuseppe Della Valle
Unidirectional and robust transport is generally observed at the edge of two- or three-dimensional quantum Hall and topological insulator systems. A hallmark of these systems is to…
Robust light transport in non-Hermitian photonic lattices
Stefano Longhi, Davide Gatti, Giuseppe Della Valle
Combating the effects of disorder on light transport in micro- and nano-integrated photonic devices is of major importance from both fundamental and applied viewpoints. In ordinary…
Fermionic statistics suppresses Fano resonances
Andrea Crespi, Linda Sansoni, Giuseppe Della Valle +6
Fano resonances and bound states with energy in the continuum are ubiquitous phenomena in different areas of physics. Observations, however, have been limited so far to single-part…
Non-Hermitian shortcut to stimulated Raman adiabatic passage
Boyan T. Torosov, Giuseppe Della Valle, Stefano Longhi
We propose a non-Hermitian generalization of stimulated Raman adiabatic passage (STIRAP), which allows one to increase speed and fidelity of the adiabatic passage. This is done by…
Optical lattices with exceptional points in the continuum
S. Longhi, G. Della Valle
The spectral, dynamical and topological properties of physical systems described by non-Hermitian (including -symmetric) Hamiltonians are deeply modified by the appea…
The imaginary Kapitza pendulum
Boyan T. Torosov, Giuseppe Della Valle, Stefano Longhi
We extend the theory of Kapitza stabilization within the complex domain, i.e. for the case of an imaginary oscillating potential. At a high oscillation frequency, the quasi-energy…
Floquet bound states in the continuum
Stefano Longhi, Giuseppe Della Valle
Quantum mechanics predicts that certain stationary potentials can sustain bound states with an energy buried in the continuous spectrum of scattered states, the so-called bound sta…
Plasmonics in heavily-doped semiconductor nanocrystals
Francesco Scotognella, Giuseppe Della Valle, Ajay Ram Srimath Kandada +6
Heavily-doped semiconductor nanocrystals characterized by a tunable plasmonic band have been gaining increasing attention recently. Herein, we introduce this type of materials focu…
Spectral and transport properties of time-periodic PT-symmetric tight-binding lattices
Giuseppe Della Valle, Stefano Longhi
We investigate the spectral properties and dynamical features of a time-periodic PT-symmetric Hamiltonian on a one-dimensional tight-binding lattice. It is shown that a high-freque…
Field-induced ferromagnetism in one-dimensional tight-binding lattices
Giuseppe Della Valle, Stefano Longhi
We theoretically show the possibility to induce magnetic ordering in non-magnetic one-dimensional systems of strongly interacting electrons hopping on a tight-binding lattice. Our…
Non-Hermitian shortcut to adiabaticity
Boyan T. Torosov, Giuseppe Della Valle, Stefano Longhi
A non-Hermitian shortcut to adiabaticity is introduced. By adding an imaginary term in the diagonal elements of the Hamiltonian of a two state quantum system, we show how one can c…
Quantum simulation of the Riemann-Hurwitz zeta function
Boyan T. Torosov, Giuseppe Della Valle, Stefano Longhi
We propose a simple realization of a quantum simulator of the Riemann-Hurwitz (RH) ζ function based on a truncation of its Dirichlet representation. We synthesize a nearest-neighbo…
Low-energy doublons in the ac-driven two-species Hubbard model
S. Longhi, G. Della Valle
The hopping dynamics of two fermionic species with different effective masses in the one-dimensional Hubbard model driven by an external field is theoretically investigated. A mult…
Transparency at the interface between two isospectral crystals
S. Longhi, G. Della Valle
Reflection at an interface separating two different media is a rather universal phenomenon which arises because of wave mismatching at the interface. By means of supersymmetric qua…
Absence of Floquet scattering in oscillating non-Hermitian potential wells
S. Longhi, G. Della Valle
Scattering of a quantum particle from an oscillating barrier or well does not generally conserve the particle energy owing to energy exchange with the photon field, and an incoming…
Klein tunneling of two correlated bosons
S. Longhi, G. Della Valle
Reflection of two strongly interacting bosons with long-rage interaction hopping on a one-dimensional lattice scattered off by a potential step is theoretically investigated in the…