A5071503690- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Terahertz technology and applications
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Plasmonic and Surface Plasmon Research
- Laser Design and Applications
- Strong Light-Matter Interactions
- Mechanical and Optical Resonators
- Semiconductor Quantum Structures and Devices
- Optical Wireless Communication Technologies
- Optical Network Technologies
- Thermal Radiation and Cooling Technologies
- Superconducting and THz Device Technology
- Photonic Crystals and Applications
- Metamaterials and Metasurfaces Applications
- Gyrotron and Vacuum Electronics Research
- Advanced Thermodynamics and Statistical Mechanics
- Optical properties and cooling technologies in crystalline materials
- Microwave Engineering and Waveguides
- Atmospheric Ozone and Climate
- Advanced MEMS and NEMS Technologies
- Quantum Dots Synthesis And Properties
- Quantum and electron transport phenomena
- Analytical Chemistry and Sensors
École Normale Supérieure - PSL
2013-2025
Université Paris Cité
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Université Paris Sciences et Lettres
2019-2024
Sorbonne Université
2013-2024
Sorbonne Paris Cité
2017-2024
Laboratoire de Physique de l'ENS
2019-2024
École Normale Supérieure
2019-2024
Université Paris 1 Panthéon-Sorbonne
2020-2024
Université Sorbonne Nouvelle
2023
We present an experimental investigation of the multimode dynamics and coherence terahertz quantum cascade lasers emitting over a spectral bandwidth ~1THz. The devices are studied in free-running under direct RF modulation. Depending on pump current we observe different regimes operation, where spectra displaying single multiple narrow beat-note signals alternate with showing characterized by intense phase-noise, extending up to few GHz. investigate relation between this phase-noise THz...
Abstract Free space optics data transmission with bitrate in excess of 10 Gbit s −1 is demonstrated at 9 µm wavelength by using a unipolar quantum optoelectronic system room temperature, composed cascade laser, modulator, and detector. The large frequency bandwidth the set detector modulator that are both high devices, while laser emits continuous wave. amplitude relies on Stark shift an absorbing optical transition out frequency. This device designed to avoid charge displacement, therefore...
We report on ultrafast GaN/AlGaN waveguide quantum cascade detectors with a peak detection wavelength of 1.5 μm. Mesa devices size 7 × and 10 μm2 have been fabricated radio-frequency impedance-matched access lines. A strong enhancement the responsivity is reported by illuminating facet, respect to illumination top surface. The room temperature estimated be higher than 9.5 ± 2 7.8 mA/W, while −3dB frequency response extracted 42 37.4 GHz for devices, respectively.
Most of the common technologies for detecting terahertz photons (>1 THz) at room temperature rely on slow thermal devices. The realization fast and sensitive detectors in this frequency range is indeed a notoriously difficult task. Here we propose novel device consisting subwavelength meta-atom resonator, which integrates nanomechanical element allows energy exchange between mechanical motion electromagnetic degrees freedom. An incident wave thus produces signal that can be read out...
Free-space optics (FSO) in the mid-infrared (mid-IR) contains rich spectral resources for future ultrahigh-speed wireless communications yet is currently under-exploited. Two atmospheric transmission windows at mid-IR, namely, mid-wave IR (MWIR, 3–5 μm) and long-wave (LWIR, 8–12 μm), show great potential supporting free-space both terrestrial space application scenarios. Particularly, LWIR signal with a longer wavelength has high intrinsic robustness against aerosols' scattering...
Quantum cascade detectors (QCDs) are unipolar infrared devices where the transport of photoexcited carriers takes place through confined electronic states, without an applied bias. In this photovoltaic mode, detector's noise is not dominated by a dark shot process, and therefore, performances less degraded at high temperature with respect to photoconductive detectors. This work describes 9 μm QCD embedded into patch-antenna metamaterial, which operates state-of-the-art performances. The...
Abstract Light management is one of the main challenges to address when designing a sensor from nanocrystal (NC) array. Indeed, carrier diffusion length, limited by hopping mechanism, much shorter than absorption depth. Several types resonators (plasmon, Bragg mirror, guided mode, Fabry–Perot cavity) have been proposed reduce volume where light absorbed. All them are inherently narrow bands, while imaging applications focus on broadband sensing. Here, an infrared in short and mid‐wave (SWIR...
In the majority of optoelectronic devices, emission and absorption light are considered as perturbative phenomena. Recently, a regime highly non-perturbative interaction, ultra-strong light-matter coupling, has attracted considerable attention, it led to changes in fundamental properties materials such electrical conductivity, rate chemical reactions, topological order, non-linear susceptibility. Here, we explore quantum infrared detector operating coupling driven by collective electronic...
Abstract HgTe nanocrystals offer a unique spectral tunability with both absorption and emission covering the near mid‐infrared as well THz window. Nevertheless, very limited amount of work is dedicated to electroluminescence from this material. An efficient diode not only requires designing structure that achieves high electrical efficiency (i.e., electron hole injections), but also finding way efficiently extract emitted photons. The shift visible infrared certainly demands revisiting...
We report room temperature heterodyne detection of a quantum cascade laser beaten with local oscillator on unipolar photodetector in two different atmospheric windows, at 4.8 $\mu$m and 9 $\mu$m. A noise equivalent power few pW is measured by employing an active stabilization technique which the signal are locked phase. The six orders magnitude lower than that obtained direct detection.
High-speed, room-temperature, quantum well infrared photodetectors (QWIPs) at λ ∼ 4.9 μm have been realized in a strain compensated In0.1Ga0.9As/Al0.4Ga0.6As heterostructure grown on GaAs substrate. The high-speed properties room temperature optimized by using specifically designed air-bridge structure, which greatly reduces the time constant of effective RC circuit, thus, allowing transmission and detection high-frequency signals. By modulating cascade laser (QCL) centered 4.7 μm, we were...
We demonstrate a high-temperature performance quantum detector of Terahertz (THz) radiation based on three-dimensional metamaterial. The metamaterial unit cell consists an inductor-capacitor (LC) resonator laterally coupled with antenna elements. absorbing region, consisting semiconductor wells, is contained in the strongly ultra-subwavelength capacitors LC structure. high loss allows increased collection efficiency for incident THz radiation, while small effective volume intense...
A significant research effort toward the generation of short terahertz (THz) pulses using quantum cascade lasers (QCLs) has been undertaken over past few years. This is motivated by desire to realize compact, electrically driven THz pulsed sources study dynamics a variety solid-state systems ultrafast spectroscopy techniques, or replace standard time domain for real-life applications. In this work we demonstrate 5-ps-long, transform-limited actively mode locking 2.5 QCL. The pulse duration...
Many photonic and plasmonic structures have been proposed to achieve ultrasubwavelength light confinement across the electromagnetic spectrum. Notwithstanding this effort, however, efficient funneling of external radiation into nanoscale volumes remains problematic. Here, we demonstrate a concept that fulfills seemingly incompatible requirements for both strong impedance matching free space. Our architecture consists antenna-coupled meta-atom resonators funnel up 90% incident an...
Optoelectronic devices rely on conductive layers as electrodes, but they usually introduce optical losses that are detrimental to the device performances. While use of transparent oxides is established in visible region, these materials show high at longer wavelengths. Here, we demonstrate a photodiode based metallic grating acting an electrode. The generates multiresonant photonic structure over diode stack and allows strong broadband absorption. obtained achieves highest performances...
The large mid-infrared (MIR) spectral region, ranging from 2.5 µm to 25 µm, has remained under-exploited in the electromagnetic spectrum, primarily due absence of viable transceiver technologies. Notably, 8-14 long-wave infrared (LWIR) atmospheric transmission window is particularly suitable for free-space optical (FSO) communication, owing its combination low propagation loss and relatively high resilience turbulence other disturbances. Here, we demonstrate a direct modulation detection...
Free-space optical communications in the mid-infrared transparency windows (4–5 and 8–14 μm wavelength regions) is emerging as a viable solution for high bitrate data transmission. Unipolar quantum optoelectronics technology of choice communication this region, thanks to frequency response detectors modulators. In work, it demonstrated that performances these devices can be substantially enhanced by embedding them into metamaterials. It also shown metamaterials have engineered differently...
Research on surface waves supported by metals at THz frequencies is experiencing a tremendous growth due to their potential for imaging, biological sensing and high-speed electronic circuits. Harnessing properties is, however, challenging because these are typically poorly confined weakly bound the metal surface. Many design strategies have been introduced overcome limitations achieve increased modal confinement, including patterned surfaces, coated waveguides variety of sub-wavelength...
A continuous-wave Fabry-Perot quantum cascade laser (QCL) emitting at 8.1 $\mu$m operating in the single mode regime has been coherently phase locked to a turn-key low-noise commercial mid-Infrared (mid-IR) optical frequency comb. The stability of comb used as reference is transferred QCL resulting an integrated residual error 0.4 rad. linewidth narrowed by more than two orders magnitude reaching sub-kHz level 1 ms observation time, limited spectral purity mid-IR Our experiment important...
The ultra-strong light-matter coupling regime has been demonstrated in a novel three-dimensional inductor-capacitor (LC) circuit resonator, embedding semiconductor two-dimensional electron gas the capacitive part. fundamental resonance of LC interacts with intersubband plasmon excitation at $\omega_c = 3.3$~THz normalized strength $2\Omega_R/\omega_c 0.27$. Light matter interaction is driven by quasi-static electric field capacitors, and takes place highly subwavelength effective volume...