Benjamin Vial
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View article: Quasinormal modes of Floquet media slabs
Quasinormal modes of Floquet media slabs Open
Exploiting non-Hermitian wave-matter interactions in time-modulated media to enable the dynamic control of electromagnetic waves requires advanced theoretical tools. In this article we bridge concepts from photonic quasinormal modes (QNMs)…
View article: Fabry-Pérot quasinormal modes for topological edge states
Fabry-Pérot quasinormal modes for topological edge states Open
Topological waveguides supporting quantum valley Hall interfacial states confine waves to interfaces and, due to topological protection, are resistant to backscattering even in the presence of defects. These topological insulators are typi…
View article: Quasinormal modes of Floquet media slabs
Quasinormal modes of Floquet media slabs Open
Exploiting non-Hermitian wave-matter interactions in time-modulated media to enable the dynamic control of electromagnetic waves requires advanced theoretical tools. In this article we bridge concepts from photonic quasinormal modes (QNMs)…
View article: The MACIV multiscale seismic experiments in the French Massif Central (2023-2027): deployment, data quality and availability
The MACIV multiscale seismic experiments in the French Massif Central (2023-2027): deployment, data quality and availability Open
In the framework of the MACIV project, a consortium of French laboratories has deployed a temporary seismic network of 100 broadband stations in the French Massif Central (FMC) for 3-4 years (2023-2027). The project aims at imaging the cru…
View article: The MACIV multiscale seismic experiments in the French Massif Central (2023-2027): deployment, data quality and availability
The MACIV multiscale seismic experiments in the French Massif Central (2023-2027): deployment, data quality and availability Open
In the framework of the MACIV project, a consortium of French laboratories has deployed a temporary seismic network of 100 broadband stations in the French Massif Central (FMC) for 3-4 years (2023-2027). The project aims at imaging the cru…
View article: Quasinormal mode expansion in thin elastic plates
Quasinormal mode expansion in thin elastic plates Open
Elastic wave manipulation using large arrays of resonators is driving the need for advanced simulation and optimization methods. To address this we introduce and explore a robust framework for wave control: quasinormal modes (QNMs). Specif…
View article: High-Frequency Homogenization for Periodic Dispersive Media
High-Frequency Homogenization for Periodic Dispersive Media Open
High-frequency homogenization is used to study dispersive media, containing inclusions placed periodically, for which the properties of the material depend on the frequency (Lorentz or Drude model with damping, for example). Effective prop…
View article: Platonic quasi-normal modes expansion
Platonic quasi-normal modes expansion Open
Elastic wave manipulation using large arrays of resonators is driving the need for advanced simulation and optimization methods. To address this we introduce and explore a robust framework for wave control: Quasi-normal modes (QNMs). Speci…
View article: Isospectral open cavities and gratings
Isospectral open cavities and gratings Open
Open cavities are often an essential component in the design of ultra-thin subwavelength metasurfaces and a typical requirement is that cavities have precise, often low frequency, resonances while simultaneously being physically compact. T…
View article: Isospectral open cavities and gratings
Isospectral open cavities and gratings Open
Open cavities are often an essential component in the design of ultra-thin subwavelength metasurfaces and a typical requirement is that cavities have precise, often low frequency, resonances whilst simultaneously being physically compact. …
View article: High-frequency homogenization for periodic dispersive media
High-frequency homogenization for periodic dispersive media Open
High-frequency homogenization is used to study dispersive media, containing inclusions placed periodically, for which the properties of the material depend on the frequency (Lorentz or Drude model with damping, for example). Effective prop…
View article: Topology optimization of a thermal cloak in the frequency domain
Topology optimization of a thermal cloak in the frequency domain Open
Designing wideband thermal cloaks remains a challenge, especially at high frequencies. We propose an optimization approach for the design of a thermal cloak for an arbitrary object with large thermal conductivity (copper), in a given frequ…
View article: The OMIV service: acquiring and sharing long-period instrumental time series for documenting landslide activity
The OMIV service: acquiring and sharing long-period instrumental time series for documenting landslide activity Open
Documenting landslide activity over long periods and monitoring standards (sensors, acquisition rates, quality-control) is critical for understanding the landslide forcing factors, develop process-based models, identify the effect of clima…
View article: Open-Source Computational Photonics with Auto Differentiable Topology Optimization
Open-Source Computational Photonics with Auto Differentiable Topology Optimization Open
In recent years, technological advances in nanofabrication have opened up new applications in the field of nanophotonics. To engineer and develop novel functionalities, rigorous and efficient numerical methods are required. In parallel, tr…
View article: Optimization and experimental validation of a bi-focal lens in the microwave domain
Optimization and experimental validation of a bi-focal lens in the microwave domain Open
The design of photonic devices is usually done through analytical modeling or variation in geometry and material parameters to obtain the required functionalities. Here, we report the use of topology optimization to obtain a bi-focal lens …
View article: High frequency meta-ferroelectrics by inverse design
High frequency meta-ferroelectrics by inverse design Open
Composites with subwavelength features exhibit effective properties that depend on microstructure morphology and materials, which can be adjusted to obtain enhanced characteristics. We detail the systematic design of electromagnetic metama…
View article: Rapid response to the Mw 4.9 earthquake of November 11, 2019 in Le Teil, Lower Rhône Valley, France
Rapid response to the Mw 4.9 earthquake of November 11, 2019 in Le Teil, Lower Rhône Valley, France Open
On November 11, 2019, a Mw 4.9 earthquake hit the region close to Montelimar (lower Rhône Valley, France), on the eastern margin of the Massif Central close to the external part of the Alps. Occuring in a moderate seismicity area, this ear…
View article: Sea Ice Thickness and Elastic Properties From the Analysis of Multimodal Guided Wave Propagation Measured With a Passive Seismic Array
Sea Ice Thickness and Elastic Properties From the Analysis of Multimodal Guided Wave Propagation Measured With a Passive Seismic Array Open
Field data are needed for a better understanding of sea ice decline in the context of climate change. The rapid technological and methodological advances of the last decade have led to a reconsideration of seismic methods in this matter. I…
View article: Seismic characterization of a clay-block rupture in Harmalière landslide, French Western Alps
Seismic characterization of a clay-block rupture in Harmalière landslide, French Western Alps Open
SUMMARY In late June 2016, the Harmalière clayey landslide (located 30 km south of the city of Grenoble, French Alps) was dramatically reactivated at the headscarp after a 35-yr-long period of continuous but limited activity. The total inv…
View article: Enhanced tunability in ferroelectric composites through local field enhancement and the effect of disorder
Enhanced tunability in ferroelectric composites through local field enhancement and the effect of disorder Open
We investigate numerically the homogenized permittivities of composites made of low-index dielectric inclusions in a ferroelectric matrix under a static electric field. A refined model is used to take into account the coupling between the …
View article: Quality Improvement of the French Permanent Broadband Stations with Shallow Posthole Installations
Quality Improvement of the French Permanent Broadband Stations with Shallow Posthole Installations Open
Dans le cadre de l’intégration aux dispositions européens EPOS, Résif s'est transformé en octobre 2023 en Epos-France, une nouvelle infrastructure de recherche aux contours thématiques plus larges et en accord avec ceux de sa grande sœur e…
View article: Autonomous seismological station (Fairfield node) of the national mobile seismological park SisMob deployed on the lake of Vallunden (Svalbard - Norway) during Icewaveguide project.
Autonomous seismological station (Fairfield node) of the national mobile seismological park SisMob deployed on the lake of Vallunden (Svalbard - Norway) during Icewaveguide project. Open
The sea ice is disappearing with global warming, and if the trend is clear over the last few decades, scientists are still wondering about the speed of this disappearance, which seems much greater than the models predict.
To better assess…
View article: Processing strategy of Continuous GPS (cGPS) observations for the French Landslide Observatory OMIV
Processing strategy of Continuous GPS (cGPS) observations for the French Landslide Observatory OMIV Open
International audience
View article: Towards a standard typology of endogenous landslide seismic sources
Towards a standard typology of endogenous landslide seismic sources Open
The objective of this work is to propose a standard classification of seismic signals generated by gravitational processes and detected at close distances (1 Hz) where most of the seismic energy is recorded at the 1 km sensor to source dis…
View article: Homogenization of periodic and random ferroelectric-dielectric composites
Homogenization of periodic and random ferroelectric-dielectric composites Open
We investigate the homogenized permittivity of ferroelectric-dielectric mixtures under a static electric field. A refined model is used to take into account the coupling between the electrostatic problem and the electric field dependent pe…