adiabatic passage [@leslie_allen_optical_1987; @shore_theory_1990] (RAP). In both cases, an eigenstate of an atomic system interacting with a specific sequence of laser pulses is modified in time and adiabatically followed, achieving a complete and robust transfer of population between two internal atomic levels of the system. Adiabatic passage processes have been extended to the external degrees of freedom of Ultracold Atoms,[@eckert_three-level_2004] being proposed for the transport of single atoms between the most distant traps of a system of three tunneling-coupled potential wells, the so-called spatial adiabatic passage. Subsequently, spatial adiabatic passage processes have also been discussed for the transport of electrons,[@greentree_coherent_2004] Bose–Einstein condensates (BECs)[@graefe_mean-field_2006; @rab_spatial_2008; @cole_spatial_2008; @ottaviani_adiabatic_2010] and holes,[@benseny_atomtronics_2010] for state [@loiko_filtering_2011] and velocity[@yurii2013] filtering of neutral atoms and also to transfer[@mcendoo_2010] and generate angular momentum states.[@rycka2013]

Spatial adiabatic passage for light propagation in a system of three total internal reflection (TIR) coupled optical waveguides has been experimentally reported.[@longhi_coherent_2007; @menchon-enrich_adiabatic_2012] In this case, a supermode of a triple-waveguide system is adiabatically modified and followed along the propagation direction, achieving a complete light transfer between the outermost waveguides of the system. Applications of the light spatial adiabatic passage, such as a polychromatic beam splitter [@dreisow_polychromatic_2009] and a spectral filter,[@menchon-enrich_light_2013] have been successfully 