Séminaire

Vendredi 13 Mars 2026 à 11h00.

Tailoring GHz Acoustic Phonons in Nanostructures: From Coherent Control to Responsive Nanophononic

Edson Cardozo
(C2N, Paris Saclay)

Salle de séminaires Lippmann

Invité(e) par
Jérémie Margueritat

présentera en 1 heure :

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Coherent acoustic phonons –collective lattice vibrations– in the GHz–THz range provide a versatile platform for controlling nanoscale wave phenomena and enabling new functionalities in nanoelectronics, photonics, sensing, and quantum technologies. Their strong coupling to other excitations makes them ideal mediators in hybrid solid-state systems. However, achieving their full potential requires overcoming challenges in transducer efficiency, propagation control, and tunability. In this seminar, I will present strategies to engineer, generate, manipulate, and detect high-frequency phonons in multilayered nanostructures, including GaAs/AlAs superlattice and mesoporous resonators. Using GaAs/AlAs-based optophononic cavities in micropillar and waveguide geometries, I will show how these structures enable simultaneous confinement of near-infrared photons and ~20 GHz hypersound, enhanced photon–phonon transduction and coherent transport over distances of at least 20 μm. Furthermore, I will discuss how mesoporous materials introduce a new degree of freedom, allowing acoustic frequencies to be tuned by environmental factors such as humidity. These results provide the building blocks for developing reconfigurable nanophononic devices and integrated phononic networks for both classical and quantum applications.

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