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Negative refraction of elastic waves in 2D phononic crystals: Contribution of resonant transmissions to the construction of the image of a point source

Author(s): Anne-Christine Hladky-Hennion | Charles Croënne | Bertrand Dubus | Jérôme Vasseur | Lionel Haumesser | Dimitri Manga | Bruno Morvan

Journal: AIP Advances
ISSN 2158-3226

Volume: 1;
Issue: 4;
Start page: 041405;
Date: 2011;
Original page

Negative refraction properties of a two-dimensional phononic crystal (PC), made of a triangular lattice of steel rods embedded in epoxy are investigated both experimentally and numerically. First, experiments have been carried out on a prism shaped PC immersed in water. Then, for focusing purposes, a flat lens is considered and the construction of the image of a point source is analyzed in details, when indices are matched between the PC and the surrounding fluid medium, whereas acoustic impedances are mismatched. Optimal conditions for focusing longitudinal elastic waves by such PC flat lens are then discussed.

Tango Jona
Tangokurs Rapperswil-Jona

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