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Updated: Aug 9, 2026

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
Published on: December 15, 2021
Time reversal of ultrasound through a phononic crystal
A Tourin1, F Van Der Biest, M Fink
1Laboratoire Ondes et Acoustique, ESPCI, Université Paris VII, UMR 7587, 10 rue Vauquelin, 75005 Paris, France.
Abstract:
In this Letter, we experimentally investigate time reversal focusing through a phononic crystal consisting of a periodic square arrangement of steel rods in water. An acoustic pulse is transmitted through the medium, received at a transducer array, time reversed and backpropagated. Both spatial focusing and time compression are studied and compared with those obtained through an equivalent disordered medium. With the phononic crystal, we do not observe the "hyperfocusing effect" that is typical of time reversal through disordered samples.
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