Matthieu Bellec

Matthieu Bellec
University of Nice Sophia Antipolis | UNS

About

50
Publications
4,682
Reads
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1,952
Citations
Citations since 2016
15 Research Items
1428 Citations
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
Additional affiliations
October 2011 - present
University of Nice Sophia Antipolis

Publications

Publications (50)
Article
Full-text available
Phase singularities appear ubiquitously in wavefields, regardless of the wave equation. Such topological defects can lead to wavefront dislocations, as observed in a humongous number of classical wave experiments. Phase singularities of wave functions are also at the heart of the topological classification of the gapped phases of matter. Despite id...
Article
We present a microwave experimental setup emulating tight-binding systems that is now widely used in the realm of topological photonics. A thorough description of the experimental building blocks is presented, showing the advantages and the limits of this platform. Various experimental realizations are then described, ranging from the selective enh...
Preprint
Full-text available
We experimentally explore the rich variety of nonlinear coherent structures arising in a turbulent flow of superfluid light past an obstacle in an all-optical configuration. The different hydrodynamic regimes observed are organised in a unique phase diagram involving the velocity of the flow and the diameter of the obstacle. Then, we focus on the v...
Article
Full-text available
Using an array of coupled microwave resonators arranged in a deformed honeycomb lattice, we experimentally observe the formation of pseudo-Landau levels in the whole crossover from vanishing to large pseudomagnetic field strengths. This result is achieved by utilising an adaptable setup in a geometry that is compatible with the pseudo-Landau levels...
Preprint
Using an array of coupled microwave resonators arranged in a deformed honeycomb lattice, we experimentally observe the formation of pseudo-Landau levels in the whole crossover from vanishing to large pseudomagnetic field strength. This is achieved by utilizing an adaptable set-up in a geometry that is compatible with the pseudo-Landau levels at all...
Article
We show that the refractive index modification photoinduced in a biased nonlinear photorefractive crystal can be accurately measured and controlled by means of a background incoherent illumination and an external electric field. The proposed easy-to-implement method is based on the far-field measurement of the diffraction patterns of a laser beam p...
Preprint
Full-text available
We show that the refractive index modification photoinduced in a biased nonlinear photorefractive crystal can be accurately measured and controlled by means of a background incoherent illumination and an external electric field. The proposed easy-to-implement method is based on the far-field measurement of the diffraction patterns of a laser beam p...
Article
Full-text available
Quantum fluids of light merge many-body physics and nonlinear optics, revealing quantum hydrodynamic features of light when it propagates in nonlinear media. One of the most outstanding evidence of light behaving as an interacting fluid is its ability to carry itself as a superfluid. Here, we report a direct experimental detection of the transition...
Article
We report a direct experimental detection of the frictional-superfluid transition in the flow of a fluid of light past a weakly perturbing localized obstacle in a bulk nonlinear crystal. In our cavityless all-optical system, we extract on the one hand a direct optical analog of the drag force experienced by the obstacle and measure on the other han...
Article
One dimensional laser-written modulated photonic lattices are known to be particularly suitable for diffraction management purposes. Here, we address the connection between discrete non-diffracting states and topological properties in such devices through the experimental observation and identification of three classes of non-diffracting state. The...
Article
Full-text available
Bipartite quantum systems from the chiral universality classes admit topologically protected zero modes at point defects. However, in two-dimensional systems these states can be difficult to separate from compacton-like localized states that arise from flat bands, formed if the two sublattices support a different number of sites within a unit cell....
Article
We report on microwave measurements of the spectrum and the spatial intensity distribution of the eigenstates for an artificial Penrose tiling. The energy-scaling behavior of the Hamiltonian parameters in this particular system allows us to identify the main patterns that determine the first hierarchical structure of the spectrum and to provide a p...
Article
Full-text available
An attractive mechanism to induce robust spatially confined states utilizes interfaces between regions with topologically distinct gapped band structures. For electromagnetic waves, this mechanism can be realized in two dimensions by breaking symmetries in analogy to the quantum Hall effect or by employing analogies to the quantum spin Hall effect,...
Article
Full-text available
A series of quantum search algorithms have been proposed recently providing an algebraic speedup compared to classical search algorithms from N to sqrt[N], where N is the number of items in the search space. In particular, devising searches on regular lattices has become popular in extending Grover's original algorithm to spatial searching. Working...
Article
Full-text available
A series of quantum search algorithms has been proposed recently providing an algebraic speed-up compared to classical search algorithms from N to √N where N is the number of items in the search space. In particular, devising searches on regular lattices have become popular extending Grover’s original algorithm to spatial searching. Working in a ti...
Article
Since their spectacular experimental realisation in the early 80's, quasicrystals have been the subject of very active research, whose domains extend far beyond the scope of solid state physics. In optics, for instance, photonic quasicrystals have attracted strong interest for their specific behaviour, induced by the particular spectral properties,...
Article
Full-text available
A series of quantum search algorithms have been proposed recently providing an algebraic speedup compared to classical search algorithms from N to \sqrt{N}, where N is the number of items in the search space. In particular, devising searches on regular lattices has become popular in extending Grover’s original algorithm to spatial searching. Workin...
Article
Full-text available
Edge states are the main ingredient to understand transport properties of graphene nanoribbons. We study experimentally the existence and the internal structure of edge states under uniaxial strain of the three main edges: zigzag, bearded, and armchair. The experiments are performed on artificial microwave graphene flakes, where the wavefunctions a...
Chapter
Faithful communication is a necessary precondition for large scale all-optical networking and quantum information processing. Related theoretical investigations in different areas of physics have led to various proposals in which finite discrete lattices are used as channels for short-distance communication tasks. Here, in the framework of femtosec...
Article
Full-text available
Photonic lattices, arrays of evanescently coupled waveguides written by femtosecond laser, are often used to control the flow of light. Two cases are here considered experimentally. i) In the linear regime, a faithful transfer is achieved when the photonic structure is judiciously designed. ii) In the nonlinear regime, we show that photonic lattice...
Article
Full-text available
Photonic lattices, arrays of evanescently coupled waveguides written by femtosecond laser, are often used to control the flow of light. Two cases are here considered experimentally. i) In the linear regime, a faithful transfer is achieved when the photonic structure is judiciously designed. ii) In the nonlinear regime, we show that photonic lattice...
Article
Full-text available
We experimentally study the propagation of microwaves in an artificial honeycomb lattice made of dielectric resonators. This evanescent propagation is well described by a tight-binding model, very much like the propagation of electrons in graphene. We measure the density of states, as well as the wave function associated with each eigenfrequency. B...
Article
Full-text available
By means of a microwave tight-binding analogue experiment of a graphenelike lattice, we observe a topological transition between a phase with a pointlike band gap characteristic of massless Dirac fermions and a gapped phase. By applying a controlled anisotropy on the structure, we investigate the transition directly via density of states measuremen...
Article
Full-text available
Faithful communication is a necessary precondition for large scale all-optical networking and quantum information processing. Related theoretical investigations in different areas of physics have led to various proposals in which finite discrete lattices are used as channels for short-distance communication tasks. Here, in the framework of femtosec...
Article
Full-text available
Experiments on hexagonal graphene-like structures using microwave measuring techniques are presented. The lowest transverse-electric resonance of coupled dielectric disks sandwiched between two metallic plates establishes a tight-binding configuration. The nearest-neighbor coupling approximation is investigated in systems with few disks. Taking adv...
Article
Full-text available
We demonstrate that direct femtosecond laser writing in silver-containing zinc and gallium phosphate glass enables generation of three-dimensional (3D) optical second-order nonlinear microstructures having an. chi((2)) value about 2.5 times that of quartz. The proposed physical model involves photo-reduction, photo-dissociation, and migration of si...
Conference Paper
A 1030 nm pulsed femtosecond laser has been use to induce modifications in silver containing glass namely femto-photo luminescent glass (FPL) and Photo-thermo refractive glass (PTR). The 5W 10Mhz laser is focused at a depth of 200 mum in the glass using a 0,52 NA objective. The output polarization of the laser is TM. The tailoring of the number of...
Conference Paper
Three-dimensional optical recording by laser-induced fluorescent silver clusters is demonstrated in glass. The fluorescence properties of these stable clusters can be altered, depending on the glass recording exposure conditions. A "Blu-ray"-like drive enables readout of the information inside the glass without cross-talk and photobleaching. This o...
Article
Full-text available
Three-dimensional optical recording by laser-induced fluorescent silver clusters is demonstrated in glass. The fluorescence properties of these stable clusters can be altered, depending on the glass recording exposure conditions. A "Blu-ray"-like drive enables readout of the information inside the glass without cross-talk and photobleaching (see fi...
Article
We report on the micro- and nano-structuring of a silver-containing zinc phosphate glass under high repetition rate femtosecond near-infrared laser exposure. Luminescent silver clusters are locally formed thanks to multi-photon absorption. The excitation mechanisms in the glass are investigated with a transient absorption pump-probe experiment. The...
Article
Three-dimensional fluorescent nanostructures are photoinduced by a near-infrared high repetition rate femtosecond laser in a silver-containing femto-photoluminescent glass. By adjusting the laser dose (fluence, number of pulses, and repetition rate), these stabilized intense fluorescent structures, composed of silver clusters, can be achieved with...
Article
Thermal poling of sodium borophosphate niobium glasses, previously coated with a thin silver layer micropatterned by femtosecond laser irradiation, is demonstrated. The field-assisted ion-exchange process for fabricating planar surface in this glass substrate is analyzed. Inside the silver ablated lines obtained by femtosecond laser irradiation, we...
Conference Paper
Femtosecond-direct-laser induced poling is demonstrated in a silver containing glass. The diffusion of the photo-induced species inside the irradiated area enables the creation of a permanent electric field, responsible of efficient second-harmonic generation.
Article
Full-text available
Three-dimensional (3D) femtosecond laser direct structuring in transparent materials is widely used for photonic applications. However, the structure size is limited by the optical diffraction. Here we report on a direct laser writing technique that produces subwavelength nanostructures independently of the experimental limiting factors. We demonst...
Article
We report on exposing a photosensitive zinc phosphate glass containing silver to different radiation (electron, gamma, optical). Laser irradiations using nanosecond ultraviolet (UV) and femtosecond infrared (IR) laser are compared with gamma and electron exposure. All irradiated glasses exhibit absorption maxima around 320 nm and 380 nm and emissio...
Conference Paper
Laser structuring and electro-poling has been carried out in silver containing glasses. The second-order NLO response after direct laser patterning has been investigated in the scope of developing further practical use of the material.
Conference Paper
The creation mechanism of femtosecond laser produced silver microstructures in silver containing zinc phosphate glass is described. Laser induced depletion in a microstructure enables second harmonic generation exhibiting 2.44 times increased second-order susceptibility than quartz.
Conference Paper
Sub-wavelength structuration by femtosecond laser interaction in a model glass doped with silver ions is investigated. Induced silver clusters are used to probe free carriers distribution. Theoretical mechanism is discussed and compared to fluorescence imaging.
Article
We demonstrate the possibility of 3D optical data storage inside a zinc phosphate glass containing silver by using third-harmonic generation imaging. Information is stored inside the glass below the refractive index modification threshold.
Article
We demonstrate the possibility of three-dimensional optical data storage inside a specific zinc phosphate glass containing silver by using third-harmonic generation (THG) imaging. Information is stored inside the glass with femtosecond laser irradiation below the refractive index modification threshold. We use the same laser for THG readout. The ca...
Article
Full-text available
L'objet de cette thèse est l'étude de l'interaction d'un laser femtoseconde avec un support photosensible particulier : un verre phosphate dopé à l'argent appelé verre photo-luminescent (PL). Une nouvelle approche permettant de réaliser en trois dimensions dans un verre PL des nanostructures d'argent aux dimensions bien inférieures à la limite de d...

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