at least one waveguide configured for propagation of light along an extension of the waveguide, said at least one waveguide comprising an elongated light coupling portion;

a slab layer extending in a plane, the slab layer comprising at least one light coupling edge arranged at a boundary of the slab layer in the plane, said slab layer being configured for propagation of light in the plane;

wherein the light coupling portion of the at least one waveguide extends alongside and at a distance from the at least one light coupling edge, forming a gap between the light coupling portion and the at least one light coupling edge;

wherein the light distribution device is further configured to allow at least some of the light being propagated in the at least one waveguide to be coupled into the slab layer through the at least one light coupling edge across the gap,

wherein the slab layer is configured to propagate the light coupled into the slab layer from the at least one waveguide such that an interference pattern is formed by interference of light in the slab layer; and

wherein the light distribution device is configured for control of the interference pattern by tuning at least one of a phase, a wavelength, an amplitude, or a polarization of light propagated in the at least one waveguide and/or by tuning a medium property of the slab layer and/or the at least one waveguide and/or, in case the light distribution device comprises a plurality of waveguides including the at least one waveguide, by control of active waveguides among the plurality of waveguides.