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Benjamin Vial
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Research

Theory, simulation and experiment on electromagnetic, elastic and acoustic waves in structured media: resonances, homogenization and inverse design.

  1. Computed field of a metal-insulator-metal absorber lit at 30°: reflection vanishes (R = 0.04%) and the field gathers under the strips
    Fig. 1. Computed field of a metal-insulator-metal absorber lit at 30°: reflection vanishes (R = 0.04%) and the field gathers under the strips

    Metamaterials and Metasurfaces

    Resonant metamaterial absorbers, annular aperture metasurfaces for infrared spectral filtering, and silicon Mie resonators

    metamaterials · metasurfaces · infrared · nanofabrication

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  2. Topology optimised all-dielectric cloak around a metal cylinder: scattered energy cut 767 times and plane wavefronts restored
    Fig. 2. Topology optimised all-dielectric cloak around a metal cylinder: scattered energy cut 767 times and plane wavefronts restored

    Topology Optimization and Inverse Design

    Inverse design of photonic, microwave and thermal devices with topology optimization and automatic differentiation

    topology optimization · inverse design · photonic · microwave · thermal

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  3. Whispering-gallery quasinormal mode of a dielectric disk (m = 7, kR = 4.405 − 0.007i): the radiated field grows with distance, the mark of a complex frequency
    Fig. 3. Whispering-gallery quasinormal mode of a dielectric disk (m = 7, kR = 4.405 − 0.007i): the radiated field grows with distance, the mark of a complex frequency

    Quasi-Normal Modes

    Quasimodal expansion, perfectly matched layers, mode coupling, isospectral cavities and time-modulated media

    quasi-normal modes · resonance · photonic · time modulation

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  4. Interface quasinormal mode of a dimerized chain of 29 resonators on a thin elastic plate (ka = 2.473 − 0.005i, Q = 113): the domain wall at the center traps the vibration and the finite chain leaks it into the plate
    Fig. 4. Interface quasinormal mode of a dimerized chain of 29 resonators on a thin elastic plate (ka = 2.473 − 0.005i, Q = 113): the domain wall at the center traps the vibration and the finite chain leaks it into the plate

    Elastic and Acoustic Waves

    Quasinormal modes of thin elastic plates, topological edge states, phononic lattices and sound absorption

    elasticity · acoustics · quasi-normal modes · topological

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  5. Point source in a crystal of dispersive rods tuned just inside the band edge: a checkerboard Bloch mode under a slow envelope, as high-frequency homogenization predicts (a/λ = 0.2480 against 0.2490 exact)
    Fig. 5. Point source in a crystal of dispersive rods tuned just inside the band edge: a checkerboard Bloch mode under a slow envelope, as high-frequency homogenization predicts (a/λ = 0.2480 against 0.2490 exact)

    Homogenization and Effective Media

    High-frequency homogenization of dispersive media, tunable ferroelectric metamaterials and material parameter extraction

    homogenization · metamaterials · ferroelectrics · material characterization

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  6. Isotropic medium built to be invisible: the field amplitude drops to 15% inside two lobes, yet the plane wave passes without scattering
    Fig. 6. Isotropic medium built to be invisible: the field amplitude drops to 15% inside two lobes, yet the plane wave passes without scattering

    Graded-Index Media and Invisibility

    Scattering-free graded-index media that shape the amplitude and phase of electromagnetic waves, and flat graded-index lenses

    invisibility · graded index · transformation optics · lenses

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