US 12,455,191 B2
Multispectral imager with enlarged spectral domain
Stéphane Tisserand, Aubagne (FR); and Laurent Roux, Marseilles (FR)
Assigned to SILIOS TECHNOLOGIES, Rousset (FR)
Appl. No. 18/039,052
Filed by SILIOS TECHNOLOGIES, Rousset (FR)
PCT Filed Nov. 18, 2021, PCT No. PCT/FR2021/052036
§ 371(c)(1), (2) Date May 26, 2023,
PCT Pub. No. WO2022/112688, PCT Pub. Date Jun. 2, 2022.
Claims priority of application No. 2012418 (FR), filed on Nov. 30, 2020.
Prior Publication US 2024/0102861 A1, Mar. 28, 2024
Int. Cl. G01J 3/26 (2006.01); G01J 3/28 (2006.01); G01J 3/12 (2006.01)
CPC G01J 3/2823 (2013.01) [G01J 3/26 (2013.01); G01J 2003/1239 (2013.01); G01J 2003/2806 (2013.01); G01J 2003/2826 (2013.01)] 12 Claims
OG exemplary drawing
 
1. 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.