experimentally demonstrated. Light guiding in waveguides has been broadly studied, being TIR waveguides the most technologically developed.[@chen_foundations_2007] However, the introduction of photonic crystals (PhCs) [@eli_yablonovitch_inhibited_1987; @krauss_two-dimensional_1996; @joannopoulos_photonic_2008] provided a new way of light guiding by means of linear defects, consisting in rows with unitary cells with a modified geometry,[@meade_photonic_1991; @meade_novel_1994; @mekis_high_1996; @joannopoulos_photonic_1997] which could be integrated in much smaller sizes than the traditional TIR waveguides. Linear defects allow for light guiding due to the creation of propagation bands within the band gap frequencies.

In analogy with the PhCs, phononic crystals (PCs) were introduced [@sigalas_band_1993; @kushwaha_acoustic_1993; @kushwaha_theory_1994; @montero_de_espinosa_ultrasonic_1998; @vasseur_experimental_2001] in the field of sound waves propagation, leading to numerous new physical phenomena for sound waves such as negative refraction and focusing,[@zhang_negative_2004; @yang_focusing_2004] nondiffractive propagation,[@perez-arjona_theoretical_2007; @espinosa_subdiffractive_2007; @soliveres_self_2009] or angular band gaps,[@romero-garcia_angular_2013] to cite a few. As well, sound guiding in linear defects in PCs has been studied,[@kafesaki_frequency_2000; @khelif_transmittivity_2002; @khelif_transmission_2003; @miyashita_full_2002; @khelif_trapping_2003; @khelif_guiding_2004; @vasseur_absolute_2008] including systems of coupled linear defects.[@sun_analyses_2005]

In this work, spatial adiabatic passage processes for sound waves propagation in linear defects are addressed for the first time to the best of our knowledge. We will extend the well-known quantum optical rapid adiabatic passage technique to sound propagation to propose novel 