Acoustic imaging and collimating by slabs of sonic crystals made from arrays of rigid cylinders in air

摘要

We show some new properties of the acoustic propagation in two-dimensionalsonic crystals, formed by parallel rigid cylinders placed in air. Thetransmission through slabs of sonic crystals and the associated band structuresare considered. It is shown that within partial bandgaps, the waves tend to becollimated or guided into the direction in which the propagation is allowed.Such a feature also prevails in the situations in which deaf bands appear. Weshow that within the partial bandgaps, a stable imaging effect can be obtainedfor flat sonic crystal slabs, in analogy to the cases with photonic crystals.