Device for imaging and delivering spectroscopic information, comprising: - an objective, adapted to form in a focal plane an image of a scene that is contained in an entrance optical field of the imaging device; - an image sensor, which is disposed in the focal plane to capture the image of the scene; and - at least one optical component having a spectral differentiation function, which is placed on a path of light rays between the scene and the focal plane, said optical component being adapted to modify an image of a point of the scene when the objective is provided with said optical component, when compared to the image of the same point of the scene as formed by the objective devoid of said optical component, in different ways for at least two possible colours for the light rays that originate from the point of the scene, so that a form of the image of the point of the scene, which appears in the image as captured by the image sensor, delivers spectroscopic information about said point of the scene, the device being characterised in that the optical component having a spectral differentiation function is adapted to phase-shift light rays that originate from a same point of the scene but that pass through two different portions of a transverse section of the device, in accordance with a first phase shift difference effective between said two portions for a first colour possible for said light rays, and in accordance with a second phase shift difference effective also between the same two portions but for a second colour possible for said light rays, the first and second colours being spectrally separated, and the first and second phase shift differences being different, the phase shift that is applied by the optical component to the rays of one same colour being constant within one same portion of the transverse section, and in that the optical component having a spectral differentiation function includes identical electromagnetic resonators (R1-R4) that are each efficient for phase-shifting and/or attenuating light rays in a variable manner when a colour of said light rays varies with respect to a resonance wavelength of each resonator, said identical resonators being distributed in one of the portions of the transverse section of the device, with the exception of at least another one of the portions of said transverse section of the device. - an objective, adapted to form in a focal plane an image of a scene that is contained in an entrance optical field of the imaging device; - an image sensor, which is disposed in the focal plane to capture the image of the scene; and - at least one optical component having a spectral differentiation function, which is placed on a path of light rays between the scene and the focal plane, said optical component being adapted to modify an image of a point of the scene when the objective is provided with said optical component, when compared to the image of the same point of the scene as formed by the objective devoid of said optical component, in different ways for at least two possible colours for the light rays that originate from the point of the scene, so that a form of the image of the point of the scene, which appears in the image as captured by the image sensor, delivers spectroscopic information about said point of the scene, the device being characterised in that the optical component having a spectral differentiation function is adapted to phase-shift light rays that originate from a same point of the scene but that pass through two different portions of a transverse section of the device, in accordance with a first phase shift difference effective between said two portions for a first colour possible for said light rays, and in accordance with a second phase shift difference effective also between the same two portions but for a second colour possible for said light rays, the first and second colours being spectrally separated, and the first and second phase shift differences being different, the phase shift that is applied by the optical component to the rays of one same colour being constant within one same portion of the transverse section, and in that the optical component having a spectral differentiation function includes identical electromagnetic resonators (R1-R4) that are each efficient for phase-shifting and/or attenuating light rays in a variable manner when a colour of said light rays varies with respect to a resonance wavelength of each resonator, said identical resonators being distributed in one of the portions of the transverse section of the device, with the exception of at least another one of the portions of said transverse section of the device.