Research
MN2S department
Phononics & Microscopy

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Phononics & Microscopy

Phononics & Microscopy

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Context

The research activities of the Phononics & Microscopy team are at the crossroads of micro-instrumentation—the science of metrology of physical phenomena at the micron scale—phononics and numerical methods with a multiscale approach from the atomic phenomena to the continuum description.

Phononics encompasses an entire array of disciplines: phononic or sonic crystals, acoustic metamaterials and superlattices. Domains of application can be found at all scales, ranging from vibration isolation to thermal transport at the nanoscale in semi-conductors, including MEMS or wireless communications filters.

The study of physical phenomena at the small scale and of their couplings involves the development of multiphysics instrumentation systems and of specific numerical models. In this context, part of the group's activities are centered on the field of microscopies (acoustics, thermal science, thermoelastics).


Goals and Research Areas

Research is organized around three main and closely related themes:

› The team is well known for research on phononic crystals and acoustic matematerials, especially for contributions to theoretical aspects as well as for achievements in ultrasonics. The team studies the interaction of phonons and photons (or sound and light).

› The team is active in the fields of local-wave microscopy, particularly for thermal science and for the metrology of elastic vibrations in MEMS, and develops dynamical metrology systems adapted to thermal and acoustic systems.

› The team develops multiscale and multiphysical modeling (both with regards to theory and numerical implementation), in particular for thermo-electro-magneto-mechanical coupling, flexoelectricity in nanosystems, and bulk magnetic properties.


Expertise

The Phononics & Microscopy team possesses state-of-the-art experimental means to measure wave propagation in phononic crystals and acoustic metamaterials (ultrasound measurements, femtosecond pump-probe setup for metrology and imaging). It develops thermal measurement instruments for small scales. The team has a Brillouin-Light-Scattering setup for bulk phonons and thin films characterization. It also has a few commercial setups (i.e. VSM and DSC under Magnetic field) to characterize thermo-magneto-mechanical materials. It relies on the MIMENTO technology center for the fabrication of MEMS and micro-acoustic devices, in particular for 3D fabrication using an additive manufacturing process via 2-photon absorption. The team has computation facilities for multi-scale and multiphysics numerical simulation.