A vibrating device comprising: - a first support configured to be deformed having a surface defined in a plane in directions X and Y; - said first support having: o at least one defect with respect to the propagation of plate modes in said first support; ∘ said defect being of geometrical nature or corresponding to a structural heterogeneity; - a second support; - at least one embedded mechanical reflector integral with said first support and in contact with said first support, configured to immobilize said first support in at least one direction Z which is perpendicular to said directions X and Y, said mechanical reflector being integral with said second support; - said embedded mechanical reflector being configured to isolate a so-called active zone (Sa) belonging to said surface defined in a plane in directions X and Y in which the plate modes propagate, said active zone excluding said defect; - said at least one embedded mechanical reflector being a material element and extending longitudinally in the direction X and/or in the direction Y of the surface; said device being characterized in that: - said first support is provided with at least one actuator located in said active region and configured to generate, in said first support, stationary plate modes propagating in said first support; and in that - said defect is a defect with respect to the propagation of the plate modes, generating disturbances at the antinodes and nodes of a propagation mode compared with those obtained in the case of the propagation of a same mode generated in a defect-free medium, i.e. a homogeneous support of rectangular geometry. - a first support configured to be deformed having a surface defined in a plane in directions X and Y; - said first support having: o at least one defect with respect to the propagation of plate modes in said first support; ∘ said defect being of geometrical nature or corresponding to a structural heterogeneity; o at least one defect with respect to the propagation of plate modes in said first support; ∘ said defect being of geometrical nature or corresponding to a structural heterogeneity; - a second support; - at least one embedded mechanical reflector integral with said first support and in contact with said first support, configured to immobilize said first support in at least one direction Z which is perpendicular to said directions X and Y, said mechanical reflector being integral with said second support; - said embedded mechanical reflector being configured to isolate a so-called active zone (Sa) belonging to said surface defined in a plane in directions X and Y in which the plate modes propagate, said active zone excluding said defect; - said at least one embedded mechanical reflector being a material element and extending longitudinally in the direction X and/or in the direction Y of the surface; - said first support is provided with at least one actuator located in said active region and configured to generate, in said first support, stationary plate modes propagating in said first support; and in that - said defect is a defect with respect to the propagation of the plate modes, generating disturbances at the antinodes and nodes of a propagation mode compared with those obtained in the case of the propagation of a same mode generated in a defect-free medium, i.e. a homogeneous support of rectangular geometry.