Dr. Luca Carletti
Department of Information Engineering (DEI), University of Padova, 32131 Padova, Italy.
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Academic Career Length
16Years (2011-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications19 July 2018 in Physical Review Letters
Journal Article
Luca Carletti
Kirill Koshelev
Costantino De AngelisYKYuri Kivshar
Yuri Kivshar
Being motivated by the recent prediction of high- modes in subwavelength dielectric resonators inspired by bound states in the continuum (BIC), we study the second-harmonic generation from isolated subwavelength AlGaAs nanoantennas. We reveal that nonlinear effects at the nanoscale can be enhanced dramatically provided the resonator parameters are tuned to the BIC regime. We predict a record-high conversion efficiency for nanoscale resonators that exceeds by 2 orders of magnitude the conversion efficiency observed at the magnetic dipole Mie resonance, thus opening the way for highly efficient nonlinear metasurfaces and metadevices.
31 October 2016 in Nano Letters
Journal Article
RCRocio Camacho-Morales
Rocio Camacho-MoralesMRMohsen Rahmani
Mohsen RahmaniSKSergey Kruk
Sergey Kruk
LWLei Wang
Lei Wang
LXLei Xu
Lei Xu
Dragomir Neshev +11
7 July 2016 in Optics Express
Journal Article
VGV. F. Gili
V. F. Gili
Luca CarlettiALA. Locatelli
A. Locatelli
Davide RoccoMFM. Finazzi
M. Finazzi
GLGiuseppe Leo
Giuseppe Leo +6
We demonstrate monolithic aluminum gallium arsenide (AlGaAs) optical nanoantennas. Using a selective oxidation technique, we fabricated epitaxial semiconductor nanocylinders on an aluminum oxide substrate. Second harmonic generation from AlGaAs nanocylinders of 400 nm height and varying radius pumped with femtosecond pulses delivered at 1554-nm wavelength has been measured, revealing a peak conversion efficiency exceeding 10−5 for nanocylinders with an optimized geometry.
1 October 2015 in Optics Express
Journal Article
Luca CarlettiALA. Locatelli
A. Locatelli
OSO. Stepanenko
O. StepanenkoGLG. Leo
G. Leo
Costantino De AngelisWe designed AlGaAs-on-aluminium-oxide all-dielectric nanoantennas with magnetic dipole resonance at near-infrared wavelengths. These devices, shaped as cylinders of 400nm height and different radii, offer a few crucial advantages with respect to the silicon-on-insulator platform for operation around 1.55μm wavelength: absence of two-photon absorption, high χ(2) nonlinearity, and the perspective of a monolithic integration with a laser. We analyzed volume χ(2) nonlinear effects associated to a magnetic dipole resonance in these nanoantennas, and we predict second-harmonic generation exceeding 10−3 efficiency with 1GW/cm2 of pump intensity.
4 November 2019 in Optica
Journal Article
GMGiuseppe Marino
Giuseppe MarinoASAlexander Solntsev
Alexander SolntsevLXLei Xu
Lei XuVGValerio F. Gili
Valerio F. Gili
Luca CarlettiDragomir Neshev +10
Optical nanoantennas have shown a great capacity for efficient extraction of photons from the near to the far field, enabling directional emission from nanoscale single-photon sources. However, their potential for the generation and extraction of multi-photon quantum states remains unexplored. Here we experimentally demonstrate the nanoscale generation of two-photon quantum states at telecommunication wavelengths based on spontaneous parametric down-conversion in an optical nanoantenna. The antenna is a crystalline AlGaAs nanocylinder, possessing Mie-type resonances at both the pump and the bi-photon wavelengths, and when excited by a pump beam it generates photon pairs with a rate of 35 Hz. Normalized to the pump energy stored by the nanoantenna, this rate corresponds to 1.4 GHz/Wm, being 1 order of magnitude higher than conventional on-chip or bulk photon-pair sources. Our experiments open the way for multiplexing several antennas for coherent generation of multi-photon quantum states with complex spatial-mode entanglement and applications in free-space quantum communications and sensing.
13 September 2019 in Physical Review Research
Journal Article
Luca CarlettiSKSergey S. Kruk
Sergey S. Kruk
ABAndrey A. Bogdanov
Andrey A. Bogdanov
CACostantino De Angelis
Costantino De Angelis
YKYuri Kivshar
Yuri Kivshar
Recent progress in nanoscale optics is driven by the physics of electric and magnetic resonances supported by high-index dielectric nanoparticles. Here, we exploit optical bound states in the continuum in a subwavelength particle enhanced by an engineered substrate undergoing an epsilon-near-zero transition from an insulator to a conductor, and uncover how to boost dramatically high-order parametric nonlinear effects. Our strategy makes feasible an observation of a variety of multistep cascaded and multifrequency nonlinear effects in an individual subwavelength resonator. This would expand substantially the range of applications of Mie-resonant dielectric metaphotonics for highly efficient subwavelength optical circuitry, nonlinear metadevices, ultrasensitive hyperspectral sensing, and quantum nanophotonics.
About Me
Luca Carletti is an Associate Professor
for the Department of Information Engineering at the University of
Brescia—Italy. He received his Ph.D. degree in Electronic Engineering at the
Institut des Nanotechnologies de Lyon, École Centrale de Lyon, Lyon, France in
2015. From 2016 to 2018 Luca Carletti worked as a Research Fellow at the
Department of Information Engineering at the University of Brescia—Italy. From
2018 to 2020 Luca Carletti was the recipient of a STARS grant (project Pulsar)
funded by the University of Padova and worked as a Research Fellow at the
Department of Information Engineering at the University of Padova—Italy. In
2020, Luca Carletti joined the Department of Information Engineering at the
University of Brescia—Italy as an Assistant Professor. His research interests
are nonlinear optical phenomena in optical nanostructures including plasmonic
devices, semiconductor and dielectric nanoresonators and metasurfaces. Luca
Carletti has been a Top Industrial Managers of Europe (TIME) student at the
Technical University of Denmark and an Erasmus-Mundus Fellow (NANOPHI) with the
Nonlinear Physics Center, The Australian National University, Australia. He is
a member of the Italian Society of Electromagnetism (SiEm), IEEE, and OSA.