Multispectral imager with enlarged spectral domain

A multispectral imager designed to analyze a spectral domain of interest comprising a first spectral band and a second spectral band distinct from the first spectral band, comprising:

• an image sensor formed of an array of macro-pixels each comprising a first photosensitive pixel and a second photosensitive pixel dedicated respectively to the first spectral band and to the second spectral band distinct from the first spectral band;
• and
• a filtering structure which comprises, for any given one of the macro-pixels, a first interference filter and a second interference filter which are superimposed respectively on the first photosensitive pixel and on the second photosensitive pixel and which are arranged to transmit respectively a first electromagnetic radiation belonging to the first spectral band and a second electromagnetic radiation belonging to the second spectral band, wherein:
• a wavelength half that of the second electromagnetic radiation is in the spectral domain of interest;
• and
• the multispectral imager further comprises a filtering layer which is, for the given one of the macro-pixels, superimposed on the second photosensitive pixel and which is configured to block passage of a third electromagnetic radiation with a wavelength half that of the second electromagnetic radiation, wherein (i) the filtering layer forms an organic high-pass filter configured to block the first electromagnetic radiation and transmit the second electromagnetic radiation or (ii) the filtering layer comprises an array of organic filters configured to each transmit a spectral band in the visible spectral domain,
• wherein:
• the first photosensitive pixel and the second photosensitive pixel are formed on and/or in a sensor substrate,
• the filtering structure comprises a filter substrate on which are formed the first interference filter and the second interference filter,
• the sensor substrate and the filter substrate are attached to each other,
• the first photosensitive pixel, the second photosensitive pixel, the first interference filter, the second interference filter, and the filtering layer are interposed between the sensor substrate and the filter substrate.