Recherche

Afficher tous les résultats pour

Accueil

Personne

Vincenzo Savona

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (95)

Superfluid-insulator transition of two-dimensional disordered Bose gases

Vincenzo Savona, Pierre Lugan, Joseph Saliba

We study the two-dimensional weakly repulsive Bose gas at zero temperature in the presence of correlated disorder. Using large-scale simulations, we show that the low-energy Bogoliubov cumulative density of states remains quadratic up to a critical disorde ...

American Physical Society2014

Unconventional photon blockade in doubly resonant microcavities with second-order nonlinearity

Vincenzo Savona

It is shown that noncentrosymmetric materials with bulk second-order nonlinear susceptibility can be used to generate strongly antibunched radiation at an arbitrary wavelength, solely determined by the resonant behavior of suitably engineered coupled micro ...

Amer Physical Soc2014

Heralded Preparation and Readout of Entangled Phonons in a Photonic Crystal Cavity

Vincenzo Savona, Hugo Pierre Alexandre Flayac

We propose a realistic protocol for the preparation and readout of mechanical Bell states in an optomechanical system. The proposal relies on parameters characterizing a photonic crystal cavity mode, coupled to two localized flexural modes of the structure ...

American Physical Society2014

Optimizing doubly-resonant photonic crystal cavity modes for second harmonic generation

Vincenzo Savona, Momchil Minkov

We optimize a photonic crystal slab for the generation of second harmonic. The optimization consists in two steps. In the first step a regular photonic crystal, consisting in a triangular lattice of circular holes in a dielectric slab, is optimized by allo ...

Spie-Int Soc Optical Engineering2014

Global Optimization of Ultrahigh-Q H0 Photonic Crystal Nanocavity in Silicon

Vincenzo Savona, Romuald Houdré, Ulagalandha Perumal Dharanipathy, Momchil Minkov, Mario Lucien Henri Tonin

The design of photonic crystal cavities has always presented a considerable challenge over the past two decades. In this work, a global optimization technique has been used to maximize the Q/V ratio of a simple H0 type nanocavity. The optimization is carri ...

Ieee2014

Gallium nitride L3 photonic crystal cavities with an average quality factor of 16 900 in the near infrared

Vincenzo Savona, Jean-François Carlin, Nicolas Grandjean, Matteo Galli, Raphaël Butté, Noelia Vico Triviño, Momchil Minkov

Photonic crystal point-defect cavities were fabricated in a GaN free-standing photonic crystal slab. The cavities are based on the popular L3 design, which was optimized using an automated process based on a genetic algorithm, in order to maximize the qual ...

American Institute of Physics2014

Automated optimization of photonic crystal slab cavities

Vincenzo Savona, Momchil Minkov

Thanks to their high quality factor, combined to the smallest modal volume, defect-cavities in photonic crystal slabs represent a promising, versatile tool for fundamental studies and applications in photonics. In paricular, the L3, H0, and H1 defects are ...

Nature Publishing Group2014

High-Q silicon photonic crystal cavity for enhanced optical nonlinearities

Vincenzo Savona, Romuald Houdré, Ulagalandha Perumal Dharanipathy, Momchil Minkov, Mario Lucien Henri Tonin

We fabricate and experimentally characterize an H0 photonic crystal slab nanocavity with a design optimized for maximal quality factor, Q = 1.7 x 10(6). The cavity, fabricated from a silicon slab, has a resonant mode at lambda = 1.59 mu m and a measured Q- ...

American Institute of Physics2014

Genetically designed L3 photonic crystal nanocavities with measured quality factor exceeding one million

Vincenzo Savona, Matteo Galli, Momchil Minkov

We report on the experimental realization of ultra-high quality factor (Q) designs of the L3-type photonic crystal nanocavity. Based on genetic optimization of the positions of few nearby holes, our design drastically improves the performance of the conven ...

American Institute of Physics2014

Superfluid–insulator transition in weakly interacting disordered Bose gases: a kernel polynomial approach

Vincenzo Savona, Pierre Lugan, Joseph Saliba

An iterative scheme based on the kernel polynomial method is devised for the efficient computation of the one-body density matrix of weakly interacting Bose gases within Bogoliubov theory. This scheme is used to analyze the coherence properties of disorder ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2013

Long-distance radiative excitation transfer between quantum dots in disordered photonic crystal waveguides

Vincenzo Savona, Momchil Minkov

We theoretically investigate the magnitude and range of the photon-mediated interaction between two quantum dots embedded in a photonic crystal waveguide, including fabrication disorder both in the crystal and in the dot positioning. We find that disorder- ...

Amer Physical Soc2013

Optimal antibunching in passive photonic devices based on coupled nonlinear resonators

Vincenzo Savona

We propose the use of weakly nonlinear passive materials for prospective applications in integrated quantum photonics. It is shown that strong enhancement of native optical nonlinearities by electromagnetic field confinement in photonic crystal resonators ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2013

Statistics of the disorder-induced losses of high-Q photonic crystal cavities

Vincenzo Savona, Romuald Houdré, Ulagalandha Perumal Dharanipathy, Momchil Minkov

We analyze and compare the effect of fabrication disorder on the quality factor of six well-known high-index photonic crystal cavity designs. The theoretical quality factors for the different nominal structures span more than three orders of magnitude, ran ...

Optical Society of America2013

Input-output theory of the unconventional photon blockade

Vincenzo Savona, Hugo Pierre Alexandre Flayac

We study the unconventional photon blockade, recently proposed for a coupled-cavity system, in the presence of input and output quantum fields. Mixing of the input or output channels still allows strong photon antibunching of the output field, but for opti ...

American Physical Society2013

Spontaneous self-ordered states of vortex-antivortex pairs in a polariton condensate

Vincenzo Savona, Benoît Marie Joseph Deveaud, Konstantinos Lagoudakis, Timothy Chi Hin Liew, Francesco Manni, Claudéric Ouellet-Plamondon

Polariton condensates have proved to be model systems to investigate topological defects, as they allow for direct and nondestructive imaging of the condensate complex order parameter. The fundamental topological excitations of such systems are quantized v ...

American Physical Society2013

Radiative coupling of quantum dots in photonic crystal structures

Vincenzo Savona, Momchil Minkov

2013

Multimode entanglement in coupled cavity arrays

Vincenzo Savona, Timothy Chi Hin Liew

We study a driven-dissipative array of coupled nonlinear optical resonators by numerically solving the von Neumann equation for the density matrix. We demonstrate that quantum correlated states of many photons can also be generated in the limit where the n ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2013

Effect of hole-shape irregularities on photonic crystal waveguides

Vincenzo Savona, Momchil Minkov

The effect of irregular hole shape on the spectrum and radiation losses of a photonic crystal waveguide is studied using Bloch-mode expansion. Deviations from a circular hole are characterized by a radius fluctuation amplitude and correlation angle. It is ...

Optical Society of America2012

Dissociation dynamics of singly charged vortices into half-quantum vortex pairs

Vincenzo Savona, Benoît Marie Joseph Deveaud, Konstantinos Lagoudakis, Timothy Chi Hin Liew, Francesco Manni

The quest for identification and understanding of fractional vorticity is a major subject of research in the quantum fluids domain, ranging from superconductors, superfluid Helium-3 to cold atoms. In a two-dimensional Bose degenerate gas with a spin degree ...

Nature Publishing Group2012

Quantum entanglement in nanocavity arrays

Vincenzo Savona, Timothy Chi Hin Liew

We show theoretically how quantum interference between linearly coupled modes with weak local nonlinearity allows the generation of continuous variable entanglement. By solving the quantum master equation for the density matrix, we show how the entanglemen ...

2012

Page 3 sur 5