A5049040081- Acoustic Wave Phenomena Research
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Photonic Crystals and Applications
- Acoustic Wave Resonator Technologies
- Ultrasonics and Acoustic Wave Propagation
- Metamaterials and Metasurfaces Applications
- Aerodynamics and Acoustics in Jet Flows
- Advanced MEMS and NEMS Technologies
- Plasmonic and Surface Plasmon Research
- Hearing Loss and Rehabilitation
- Magnetic properties of thin films
- Thermal Radiation and Cooling Technologies
- Molecular Junctions and Nanostructures
- Surface and Thin Film Phenomena
- Gold and Silver Nanoparticles Synthesis and Applications
- Music Technology and Sound Studies
- Magnetic Properties and Applications
- Microwave Engineering and Waveguides
- Speech and Audio Processing
- Underwater Acoustics Research
- Surface Chemistry and Catalysis
- Noise Effects and Management
- Magnetic and transport properties of perovskites and related materials
- Optical and Acousto-Optic Technologies
Institut d'électronique de microélectronique et de nanotechnologie
2016-2025
Université de Lille
2016-2025
École Centrale de Lille
2014-2024
Centre National de la Recherche Scientifique
2015-2024
Université Polytechnique Hauts-de-France
2021-2024
Otto-von-Guericke University Magdeburg
2016-2021
Technical University of Denmark
2016-2021
University of Bremen
2021
Institut d'Électronique et des Systèmes
2017
Tongji University
2015
We investigate theoretically the band structure of a phononic crystal finite thickness constituted periodical array cylindrical dots deposited on thin plate homogeneous material. show that this can display low-frequency gap, as compared to acoustic wavelengths in constituent materials, similarly case locally resonant structures. The opening gap requires an appropriate choice geometrical parameters, and particular height dots. However, persists for various combinations materials constituting...
Acoustic band gap (ABG) materials constituted of steel hollow cylinders immersed in water can exhibit a tunable narrow pass (NPB) located inside their gap. We theoretically investigate, using the finite difference time domain (FDTD) method, properties waveguides composed row two-dimensional (2D) phononic crystal made filled cylinders. These NPB's at frequencies slightly higher than infinite periodic ABG counterpart. The frequency waveguide's NPB be selected by adjusting inner radius or...
We introduce a supercell plane wave expansion (SC-PWE) method for the calculation of elastic band structures two-dimensional phononic crystal plates. compute structure solid-solid and air-solid The air is modeled as low impedance medium (LIM) with very density high velocities sound. investigate influence constituent materials, plate thickness, geometry array on structure. establish range validity SC-PWE in terms rate convergence respect to number waves contrast physical properties matrix...
The feasibility of tuning the band structure phononic crystals is demonstrated by employing magnetostrictive materials and applying an external magnetic field. Band structures are calculated with a plane wave expansion method that accounts for coupling between elastic behavior field through development elastic, piezomagnetic, permeability effective tensors. We show contactless tunability absolute gaps two-dimensional crystal composed epoxy matrix Terfenol-D inclusions. tunable behaves like...
We investigate the possibility of designing phononic crystal-based devices for telecommunication applications using materials commonly employed in microfabrication. focus our attention on a crystal made square array cylindrical holes drilled an active piezoelectric PZT5A matrix. Two different structures are considered, namely, freestanding plate and deposited silicon substrate. The geometrical characteristics plates (lattice parameter thickness) were chosen to ensure existence absolute band...
The engineering of complex architectures from functional molecules on surfaces provides new pathways to control matter at the nanoscale. In this article, we present a combined study addressing self-assembly amino acid L-methionine Ag(111). Scanning tunneling microscopy data reveal spontaneous ordering in extended molecular chains oriented along high-symmetry substrate directions. At intermediate coverages, regular biomolecular gratings evolve whose periodicity can be tuned nanometer scale by...
We discuss the simultaneous existence of phononic and photonic band gaps in a periodic array holes drilled Si membrane. investigate detail both centered square lattice boron nitride (BN) with two atoms per unit cell which include simple square, triangular honeycomb lattices as particular cases. show that complete can be obtained from well BN close to honeycomb. Otherwise, all investigated structures present possibility gap together given symmetry, odd or even, depending on geometrical parameters.
We investigate the properties of a phononic crystal plate with hollow pillars and introduce existence whispering-gallery modes (WGMs). show that by tuning inner radius pillar, these can merge inside both Bragg low frequency band gaps, deserving acoustic metamaterial applications. These be used as narrow pass bands for which quality factor greatly enhanced introduction an additional cylinder between plate. discuss some functionalities confined WGM in gaps wavelength division multiplexer...
We propose an efficient optomechanical mass sensor operating at exceptional points (EPs), non-hermitian degeneracies where eigenvalues of a system and their corresponding eigenvectors simultaneously coalesce. The benchmark consists two cavities (OMCs) that are mechanically coupled, we engineer mechanical gain (loss) by driving the cavity with blue (red) detuned laser. features EP loss balance, any perturbation induces frequency splitting scales as square-root strength, resulting in giant...
We present a combined low-temperature scanning tunneling microscopy and near-edge X-ray adsorption fine structure study on the interaction of tetrapyridyl-porphyrin (TPyP) molecules with Cu(111) surface. A novel approach using data from complementary experimental techniques charge density calculations allows us to determine geometry TPyP Cu(111). The are centered "bridge" sites substrate lattice exhibit strong deformation involving saddle-shaped macrocycle distortion as well considerable...
We report on a phononic crystal (PC) consisting of square array cylindrical polyvinylchloride inclusions in air that exhibits positive, negative, or zero refraction depending the angle incident sound beam. For all three cases refraction, transmitted beam undergoes splitting upon exiting crystal. These properties are analyzed theoretically using finite difference time domain method and demonstrated experimentally. Band structures equifrequency surfaces (EFSs) calculated with plane-wave...
Numerical simulations, based on a finite-difference-time-domain (FDTD) method, of infrared light propagation for add/drop filtering in two-dimensional (2D) metal–insulator–metal (Ag–SiO2–Ag) resonators are reported to design 2D Y-bent plasmonic waveguides with possible applications telecommunication wavelength demultiplexing (WDM). First, we study optical transmission and reflection nanoscale SiO2 waveguide coupled nanocavity the same insulator located either inside or side linear sandwiched...
We present a theoretical analysis of the phonon transport and guiding acoustic waves in phononic crystal made up square array cylindrical dots, which is deposited on thin homogeneous plate. With appropriate choice geometrical parameters, this structure can display several gaps, one them being well below Bragg gap. help finite difference time domain method, we calculate transmission coefficient vs frequency demonstrate good agreement with dispersion curves. show possibility guided modes...
We investigate the acousto-optic coupling, based on both photo-elastic and opto-mechanical mechanisms, in periodic structures with simultaneous photonic phononic band gaps. The investigations are focused a cavity defect which strong confinement of acoustic optic waves enhances interaction. calculate modulation each mode frequency by confined cavity. compare strength for effects different cases. Both mechanisms can be phase or out produce additive subtractive total coupling.
Abstract The interaction of light and sound waves at the micro nanoscale has attracted considerable interest in recent years. main reason is that this responsible for a wide variety intriguing physical phenomena, ranging from laser-induced cooling micromechanical resonator down to its ground state management speed guided pulses by exciting waves. A common feature all these phenomena feasibility tightly confine photons phonons similar wavelengths very small volume. Amongst different...
We report the changes in dispersion relations of hypersonic acoustic phonons free-standing silicon membranes as thin \sim 8 nm. observe a reduction phase and group velocities fundamental flexural mode by more than one order magnitude compared to bulk values. The modification relation nanostructures has important consequences for noise control nano micro-electromechanical systems (MEMS/NEMS) well opto-mechanical devices.
We demonstrate theoretically that photons and acoustic phonons can be simultaneously guided slowed down in specially designed nanostructures.Phoxonic crystal waveguides presenting simultaneous phononic photonic band gaps were perforated silicon membranes conveniently obtained using silicon-on-insulator technology.Geometrical parameters for first chosen optical wavelengths around 1550 nm, based on the finite element analysis of a perfect phoxonic circular holes.A plain core waveguide was then...
We theoretically investigate the potentiality of dual phononic-photonic (the so-called phoxonic) crystals for liquid sensing applications. study transmission through a two-dimensional (2D) crystal made infinite cylindrical holes in silicon substrate, where one row oriented perpendicular to propagation direction is filled with liquid. The infiltrated may have different radius than regular holes. show, defect structure, existence well-defined features (peaks or dips) spectra acoustic and...