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Simultaneous Photonic And Phononic Topological Interface States In A Si-based Membrane Crystal
No full textposterInternational audienceWe investigate the emergence of topological interface states in a silicon-based crystal supporting both photonic and phononic modes. Our results demonstrate that these modes are robust and immune to certain defects, such as bends, ensuring stable wave propagation
Copper-decorated porous silicon for the bimodal detection of DMMP, a sarin simulant, by FT-IR spectroscopy and matrix-free laser desorption ionization mass spectrometry
No full textInternational audienceThe release of organophosphates into the natural environment may directly and indirectly affect human health and cause severe damage to environmental ecosystems, thus raising global concern. In addition, some of these organophosphorus compounds (OPs) have been weaponized. Among them, Sarin, which is an OP-based nerve agent, has already been used as massive chemical weapons emphasising the need for their detection. In this study, we propose the development of a new nanomaterial based on porous silicon (PSi) decorated with copper particles for the detection of dimethyl methylphosphonate (DMMP), a sarin simulant. We took advantage of the large surface area of PSi and the specificity towards DMMP brought by copper particle decoration. Two types of PSi porosities (60 % and 80 %), were used while experimental copper particle deposition method was evaluated to ensure a uniform distribution within porous texturation. Then, and for the first time, the presence of DMMP was detected bimodally using FT-IR and mass spectrometry from the same PSi-Cu surface. We demonstrated enhanced specificity for DMMP detection using porous silicon decorated with copper particles (PSi-Cu) compared to unmodified PSi. Several characteristic IR absorption bands of DMMP were clearly observed, including peaks at 1319 and 925 cm-1 corresponding to the symmetric and asymmetric deformation modes of the P-CH₃ group, the P-O-C stretching mode at 830 cm-1, and the P --O stretching vibration at 1246 cm-1. In addition, the PSi-Cu surface enabled matrix-free surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS), revealing a strong interaction between DMMP and copper. The dominant mass spectral peak at m/z = 186, assigned to the [M + Cu]+ adduct, confirms a Lewis acid-type interaction between DMMP and the Cu-decorated surface. This study aimed to demonstrate, for the first time, the feasibility of combining FT-IR spectroscopy and matrix-free SALDI-MS for DMMP detection on a single, untreated PSi-Cu platform. Although the sensitivity, response time, and recovery time of the system are not yet state-of-the-art, our results highlight the potential of this dual-mode analytical approach for analyzing complex samples on same surface making it an invaluable tool in fields such as chemistry, pharmaceuticals, forensics, and environmental science
Parametric Control of Phonon Mode Coupling in Double-Drum Resonators
No full textInternational audienceParametrically coupled micro- and nano-electromechanical resonators serve as ideal model systems for the study of coherent multimode energy transfer and conversion, offering diverse interaction mechanisms and flexible control of mode coupling [1-3]. This work presents experimental and theoretical studies of two-mode coupling, the control of multimode coupling, and unconventional thermal noise squeezing in double-drum resonator systems. The results reveal the rich dynamics of coupled double-drum resonators and present potential for advancing phononic applications in the fields of quantum engineering and quantum sensing.The double-drum resonator used in this study consists of a silicon nitride drum and an aluminium drum configured as parallel vibrating plates coupled by electrostatic forces [1-2]. Its special design provides unique access to exploring the phonon-cavity electromechanics through analogies with microwave optomechanical systems [4-5]. First, we will present sideband cooling of the phonon mode and the creation of constructive and destructive interferences in this double-rum system [2-3]. Then, we introduce the squeezing of the thermal noise carried by both drum resonators by simultaneously pumping the silicon nitride resonator at its blue and red sidebands with frequency detuning around the aluminium drum resonance frequency. The unconventional squeezing phenomenon was observed, beyond the standard 2Ω parametric pumping with the 3dB limit. These observations are modelled by the parametrically coupled equations of motion in the linear regime and can be understood by considering the destructive interference produced by the two pump tones in this parametrically coupled system. We also demonstrate the control of 3-mode coupling by introducing multi-tone techniques. In a single double-drum resonator device, we select two modes of the silicon nitride drum as two 'phonon cavities' to couple coherently with the fundamental mode of the aluminium drum. Two pump tones are used to pump the phonon cavities, and the third tone is used to probe one of these three modes. By tuning the phonon coupling rates between the coupled low frequency drum and two cavities, one of the mechanical modes can be brought into or out of the coupled system by controlling the mechanical dark mode and the bright mode. The relative phases between the different modes can be well defined, although they correspond to different frequencies. A similar method has been used to guide phonons between four drum resonators.References[1] A. Pokharel, et al., Nano Letters, 22, 7351 (2022)[2] X. Zhou, et al., Nano Letters, 21, 5738 (2021)[3] H. Xu, et al., Nano Letters, 24, 8550–8557 (2024)[4] X. Zhou, et al. Physical Review Applied 12.4 (2019): 044066.[5] D Cattiaux, et al., Nature Communications 12, 6182 (2021
Brain‐Inspired Polymer Dendrite Networks for Morphology‐Dependent Computing Hardware
No full textInternational audienceProcess variation is always a challenge to mitigate in electronics. This especially holds true for organic semiconductors, where reproducibility concerns hinder industrialization. Challenging this concept, it shows AC-electropolymerization to be a powerful platform for the development of morphology-dependent computing hardware, thanks precisely to its intrinsic stochasticity. The findings reveal that electropolymerized polymer dendrite networks exhibit a complex structure-operation relationship that allows to implement nearly linear to nonlinear functions. Moreover, dendritic networks can integrate a limitless number of inputs from their environment, which can be used to the advantage in the context of in materio computing to discriminate between different spatiotemporal inputs. These results position electropolymerization as a pivotal technique for the bottom-up implementation of computationally powerful objects. This study anticipates this study to help shifting the negative perception of variability in the material science community and promote the electropolymerization framework as a foundation for the development of a new generation of hardware defined by its topological richness
Computer vision in warehouse management automation: A survey on implemented methods with prototyping hardware
No full textInternational audienceIn the context of the fourth industrial revolution, warehouse management systems are increasingly integrating advanced computer vision technologies, such as Autonomous Mobile Robots (AMRs), drones, Unmanned Aerial Vehicles (UAVs), robotic arms, and smart glasses. Despite their growing adoption, a critical gap remains in understanding the specific hardware configurations and computer vision methodologies used in prototyping for warehouse automation. This survey offers a comprehensive analysis of recent prototyping efforts by exploring the relationship between computer vision, vision sensor technologies, and Artificial Intelligence (AI) hardware. Through rigorous manual screening of 1,570 papers, we identify 50 key studies that explicitly detail the implementation of computer vision techniques in warehouse automation tasks since 2013. Unlike existing reviews, our work uniquely highlights the gap between computer vision methods and their deployment on edge AI hardware for warehouse automation. We analyze the adopted techniques in image processing, object detection, classification, segmentation, and navigation, alongside the latest advancements in AI accelerators and robotic platforms. Our findings stress the necessity of transitioning to next-generation AI hardware, implementing standardized benchmarking methods, leveraging photorealistic synthetic datasets, and deploying vision-based AI models on advanced hardware platforms. This surveying method ensures robustness and easy reproducibility for future use, serving as a critical reference for researchers and industry practitioners seeking to stay continuously updated on warehouse automation prototypes with computer vision
Quantitative calibration of a TWPA applied to an optomechanical platform
No full textInternational audienceIn the last decade, the microwave quantum electronics toolbox has been enriched with quantum-limited detection devices such as Traveling Waves Parametric Amplifiers (TWPAs) [1]. The extreme sensitivity they provide is not only mandatory for some physics applications within quantum information processing, but is also the key element that will determine the detection limit of quantum sensing setups. In the framework of microwave optomechanical systems, an unprecedented range of small motions and forces is accessible, for which a specific quantitative calibration becomes necessary. We report on quantum-limited measurements performed with an aluminum drumhead mechanical device within the temperature range 4 mK – 400 mK. The whole setup is carefully calibrated, especially taking into account the power-dependence of microwave absorption in the superconducting optomechanical cavity [2]. This effect is commonly attributed to Two-Level-Systems (TLSs) present in the metal oxide. We demonstrate that a similar feature exists in the TWPA, and can be phenomenologically fit with adapted expressions (see Fig. 1). The power and temperature dependence is studied over the full parameter range, leading to an absolute definition of phonon population (i.e. Brownian motion amplitude), with an uncertainty +- 20 % [3]
Nonlinear Energy Transfer and Frequency Comb Generation in Coupled Silicon nitride Drum Resonators
No full textInternational audienceMechanical resonators serve as ideal experimental and theoretical platforms for exploring nonlinear phenomena such as Duffing nonlinearity, frequency comb generation, parametric amplification, and chaos. Their suitability arises from intrinsic nonlinearities introduced by device geometry and multimode features. In this work, we present investigations of nonlinear energy transfer in coupled drum microelectromechanical resonators, based on measurements of frequency jumps and frequency comb generation from internal resonance effects.The microelectromechanical devices measured in this work are silicon nitride membrane drum resonators with a diameter of 30 µm and a thickness of 80 nm [1]. Two drum resonators are electrically connected by two suspended top gates, which can be manipulated separately and read out by microwave optomechanical interferometry. The driving force is generated by combining the DC and AC signals and is applied to the drum resonator via its coupled gate. The resonant frequencies are 12.39 MHz and 12.47 MHz respectively. In order to investigate the non-linear behaviour of our device, the frequency responses of the fundamental mode Ω01 for both two drums were measured as a function of the electrostatic forces at room temperature in the frequency forward sweeps. The frequency jump down point moves smoothly towards the higher frequency range as the drive force is increased in the relatively smaller value range. While, with continuing increasing the driving forces (the Vac), the jump-down point starts to suddenly shift to the large frequency point, forming several frequency jumps in x-axis, as shown in Fig.1 (a), no longer following the simple Duffing nonlinear behavior [1]. On the other hand, the frequency responses show several plateaus (see responses in the y-axis, these dips) when the driving forces are increased at certain higher amplitudes. This means that the energy used to excite the current fundamental modes has been transferred to the other modes by internal resonances [2]. In order to understand the mechanism, we bias in one of these dips at the fir frequency and clearly frequency combs have been observed in the spectrum around the 2fir and 3fir. In addition, we trace the frequency responses of these higher modes and find that they are also excited into the nonlinear region. We will discuss these phenomena through the development of an analytical nonlinear coupling model.[1] X. Zhou, et al., Nano Letters 21 5738-5744 (2021)[2] S. Houri, et al, Phys. Rev. Applied, 13, 014049 (2020
Servitude par destination du père de famille et unicité du propriétaire antérieur
No full textInternational audience(Civ. 3e, 23 janv. 2025, no 23-12.385, D. 2025. 190 ; AJDI 2025. 485, obs. F. Cohet ; JCP N 2025. 1076, obs. F. Vern ; JCP 2025. doctr. 617, obs. H. Périnet-Marquet ; Defrénois 2025, no 9, p. 13, obs. M. Pernot ; Civ. 3e, 27 févr. 2025, no 23-10.658, D. 2025. 1153, note B. Chaffois ; AJ fam. 2025. 233, obs. N. Levillain ; RDC 2025. 108, obs. F. Danos ; JCP 2025. doctr. 617, obs. H. Périnet-Marquet ; JCP N 2025. 1085, obs. G. Gil ; Gaz. Pal. 2025. GPL478e5, obs. J. Dubarry
Evaluation of 5G Relay-Empowered and Device-to-Device Communications for Rescue Mission
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NEW INSIGHTS ON THE STABILIZATION OF GENERALIZED SERIALLY CONNECTED PIEZOELECTRIC AND ELASTIC BEAMS
No full textThis study investigates the stability of a transmission problem involving alternating magnetizable piezoelectric and elastic beams subjected to various partial damping scenarios, including internal and electrical boundary damping. The system consists of N + 1 piezoelectric components and N elastic components arranged in a serial configuration where N is a natural number and N ≥ 1. This work extends and generalizes the results presented in [6]