A5021456222- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Optical Network Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Photonic Communication Systems
- Nonlinear Photonic Systems
- Quantum chaos and dynamical systems
- Advanced Fiber Optic Sensors
- Terahertz technology and applications
- Radio Frequency Integrated Circuit Design
- Photonic Crystal and Fiber Optics
- Laser-Matter Interactions and Applications
- Millimeter-Wave Propagation and Modeling
- Spectroscopy and Laser Applications
- Photonic Crystals and Applications
- Nonlinear Waves and Solitons
- Semiconductor Lasers and Optical Devices
- Microwave Engineering and Waveguides
- Quantum Mechanics and Applications
- Quantum optics and atomic interactions
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Nonlinear Dynamics and Pattern Formation
- Topological Materials and Phenomena
- Semiconductor Quantum Structures and Devices
Laboratoire de Physique des Lasers, Atomes et Molécules
2016-2025
Centre National de la Recherche Scientifique
2015-2025
Université de Lille
2016-2025
Institut d'électronique de microélectronique et de nanotechnologie
2011-2023
Laboratoire Kastler Brossel
1995-1998
Sorbonne Université
1995-1997
We realize experimentally an atom-optics quantum chaotic system, the quasiperiodic kicked rotor, which is equivalent to a 3D disordered that allow us demonstrate Anderson metal-insulator transition. Sensitive measurements of atomic wavefunction dynamics and use finite-size scaling techniques make it possible extract both critical parameters exponent transition, in good agreement with value obtained numerical simulations model.
The pioneering paper 'Optical rogue waves' by Solli et al (2007 Nature 450 1054) started the new subfield in optics. This work launched a great deal of activity on this novel subject. As result, initial concept has expanded and been enriched ideas. Various approaches have suggested since then. A fresh look at older results discoveries undertaken, stimulated 'optical waves'. Presently, there may not unique view how scientific term should be used developed. There is nothing surprising when...
The revolutionary 5G cellular systems represent a breakthrough in the communication network design to provide single platform for enabling enhanced broadband communications, virtual reality, autonomous driving, and internet of everything. However, ongoing massive deployment networks has unveiled inherent limitations that have stimulated demand innovative technologies with vision toward 6G communications. Terahertz (0.1-10 THz) technology been identified as critical enabler communications...
We present an investigation of the cesium magneto-optical trap, with particular regard to best combination atomic density and temperature that can be produced. Conditions in trap depend on four independent parameters: detuning intensity light, gradient magnetic field, number atoms trapped. have varied all these parameters measured distribution trapped cloud. Both nonlinear variation position restoring force reabsorption photons scattered cloud limit maximum density, we empirical model takes...
We measure the energy distribution of a slow Cesium atomic beam when it is chopped into short pulse and we find results which agree well with time-energy uncertainty principle. The chopper consists in an mirror formed by laser evanescent wave whose intensity pulsed. use temporally diffracted to design Young-slit-type interferometer, interfering paths consist trajectories bouncing at two different times on mirror. By changing intensity, can scan phase difference between arms.
Cesium atoms prepared in a state of well-defined total energy have been reflected from vibrating mirror, causing the matter waves to be phase modulated. The mirror is an evanescent light wave whose intensity modulated time at frequency $\ensuremath{\nu}$ range 0 2 MHz; are normal incidence. resulting beam consists ``carrier'' plus various sidebands corresponding de Broglie propagating different velocities. precision and flexibility this technique make it promising tool atom optics.
Free space communications with huge data capacity have become a key point for the development of mobile access, services, and network technologies convergence. Wireless links using emerging terahertz technologies, also referred to as T-ray communications, an intensive research field within last years since T-rays at millimeter/submillimeter frontier remain more robust in terms scintillation, dielectric obstacles, fog compared near-infrared signals. Using passive THz hot-spot which can be fed...
Dimension 2 is expected to be the lower critical dimension for Anderson localization in a time-reversal-invariant disordered quantum system. Using an atomic quasiperiodic kicked rotor---equivalent two-dimensional Anderson-like model---we experimentally study and we observe localized wave function dynamics. We also show that length depends exponentially on disorder strength anisotropy quantitative agreement with predictions of self-consistent theory 2D localization.
This article presents a wireless communication point-to-point link operated in the low terahertz (THz) range, at center frequency of 300 GHz. The is composed all-electronic components based on monolithic millimeter wave integrated circuits fabricated an InGaAs metamorphic high electron mobility transistor technology. Different configurations and architectures are compared analyzed. superheterodyne approach proves to be most promising all, being compliant with new IEEE standard for 100 Gb/s...
The topological phase revolutionized wave transport, enabling integrated photonic interconnects with sharp light bending on a chip. However, the persistent challenge of momentum mismatch during intermedium mode transitions due to material impedance inconsistency remains. We present 100-Gbps wireless communication link using devices that conserve valley momentum. valley-conserved silicon waveguide antenna achieves 12.2-dBi gain, constant group delay across 30-GHz bandwidth and enables active...
Photonic diplexers are being widely investigated for high data transfer rates in on-chip communication. However, dividing the available spectrum into nonoverlapping multicarrier frequency sub-bands has remained a challenge designing frequency-selective time-invariant channels. Here, an topological diplexer is reported exhibiting terahertz band filtering through Klein tunneling of edge modes. The silicon chip facilitates two high-speed channels with quadrature amplitude modulation (QAM) over...
Using a three-frequency one-dimensional kicked rotor experimentally realized with cold atomic gas, we study the transport properties at critical point of metal-insulator Anderson transition. We accurately measure time evolution an initially localized wave packet and show that it displays scaling invariance characteristic this second-order phase The shape momentum distribution is found to be in excellent agreement analytical form deduced from self-consistent theory localization.
We experimentally test the universality of Anderson three dimensional metal-insulator transition, using a quasiperiodic atomic kicked rotor. Nine sets parameters controlling microscopic details have been tested. Our observation indicates that transition is second order, with critical exponent independent details; average value 1.63±0.05 agrees very well numerically predicted ν=1.58.
Using a cold atomic gas exposed to laser pulses---a realization of the chaotic quasiperiodic kicked rotor with three incommensurate frequencies---we study experimentally and theoretically Anderson metal-insulator transition in dimensions. Sensitive measurements wave function use finite-size scaling techniques make it possible unambiguously demonstrate existence quantum phase measure its critical exponents. By taking proper account systematic corrections one-parameter scaling, we show...
The achievement of single-channel 100 Gbit/s transmission, using linear unitravelling carrier photodiodes and QAM-16 modulation format is reported. wireless link has been done in the indoor case, considering recent frequency standardised 300 GHz bands.
Significance Modulation instability (MI) is a ubiquitous phenomenon in physics, corresponding to the growth of weakly modulated continuous wave nonlinear medium and leading generation large-amplitude periodic train. In space, it transforms plane waves into spatially patterns. frequency domain, MI result energy transfer from strong single spectral component sidebands. While linear stability analysis predicts limited band unstable frequencies modulation, recent developments based on theory...
The sixth generation (6 G) communication standard is expected to include support for very-high data rates (over 100 Gbit/s) and device electronics will require processors with on-chip communications able such high bandwidths. Although the terahertz band possesses ample bandwidth, conventional THz waveguides suffer from bending losses are sensitive process defects. recent revelation of topological valley photonic crystal (VPC), which exhibits near zero-loss bends, zero back-scattering...
This paper presents the first experimental evidence of transition from dynamical localization to delocalization under influence a quasiperiodic driving on quantum system. A kicked rotator is realized by placing cold atoms in pulsed, far-detuned, standing wave. If wave periodically one observes suppression classical chaotic diffusion, i.e., localization. pulsed quasiperiodically, observed or not, depending frequencies being commensurable incommensurable. One can thus study localized...
The celebrated Fermi-Pasta-Ulam recurrence phenomenon in nonlinear dynamics was first demonstrated experimentally optical fibers 50 years after its theoretical discovery. But it expected to be suppressed when the so-called third-third-order dispersion (TOD) became relevant. A new optical-fiber experiment shows that not only survives presence of TOD, but disappears and reappears several times as pump frequency is varied.
Integrated photonics is an emerging technology for many existing and future telecommunication data communication applications. One platform of particular interest silicon nitride (SiN), thanks to—among others—its very low-loss waveguides. However, it lacks active devices, such as lasers, amplifiers, photodiodes. For this, hybrid or heterogeneous integration needed. Here, we bring high-speed uni-traveling-carrier photodiodes to a SiN-platform by means micro-transfer-printing. This versatile...
The increasing demand for high-capacity wireless communication requires data links at millimeter waves and terahertz frequencies, respectively. At those electronic photonic technologies compete to prove powerful transmitters receivers. In this work, we demonstrate a link 300 GHz using fiber-coupled PIN photodiode as the transmitter. Thus, whole emitter side is based on components techniques from standard fiber-optical communication, which inherently enable broadband channels. We investigated...