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Phononics & opto-acoustics

A reconfigurable phononic circuit

Applications: RF information processing, acoustic sensing, and acousto-electronic microfluidics
A phonon board is based on a solid membrane perforated with a periodic array of holes. The diameter of the holes is chosen so that a complete band gap is obtained: no waves can propagate along the membrane. When a single hole is filled with water, a number of localized modes are formed. Each mode has a unique pattern of pressure in water. In the surrounding solid, the amplitude of the vibration decays exponentially, thanks to the complete band gap.
More generally, by filling several holes, one can form channels within which the propagation of waves remains confined. A totally reconfigurable phononic system can hence be formed simply by selecting the correct holes to be filled.

 

First demonstration of the optical generation of surface acoustic waves in photonic microwires

FEMTO-ST and the Institut d’Optique (Paris) have discovered a new type of Brillouin light scattering driven by surface acoustic waves in a subwavelength optical fibre.
These hair-like slivers of silica glass, fabricated by tapering optical fibres, enable enhanced nonlinear optical effects and applications not currently possible with comparatively bulky optical fibres.
Exploring this novel effect, researchers at FEMTO-ST have observed that light can shake and distort the optical microwire through electrostriction, leading to mechanical surface undulations of a few nanometers.
As these acoustic resonances are highly sensitive to surface defects or features, surface acoustic wave Brillouin scattering opens new opportunities for various sensing applications, but also in other domains such as microwave photonics and nonlinear plasmonics.
Partners: EPFL, PhLAM Lille, CUDOS, Univ. McGill

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