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We investigate spatial adiabatic passage processes for sound wavespropagation in sonic crystals, consisting of steel cylinders embedded in awater host medium, that present two linear defects. This work constitutes anextension of the well-known quantum optical rapid adiabatic passage techniqueto the field of sound propagation. Several spatial adiabatic passage devicesare proposed, by appropriately designing the geometry of the two linear defectsalong the propagation direction, to work as a coherent multifrequency adiabaticsplitter, a phase difference analyzer and a coherent multifrequency adiabaticcoupler. These devices are robust in front of fluctuations of the geometricparameter values.

Spatial adiabatic passage processes in sonic crystals with linear defects