Infrared detector comprising a package integrating at least one diffraction grating

An infrared detector comprising:

• a sensitive retina capable of detecting a radiation in the wavelength range between 8 and 14 micrometers;
• and
• a package containing the sensitive retina and comprising a window located opposite to the retina, said window comprising a substrate at least partially transparent in the wavelength range between 2 and 14 micrometers;
• and
• a set of optical filters formed on the window to attenuate an incident radiation on the retina in a wavelength range between 2 and 8 micrometers, and transmitting the incident radiation in the wavelength range between 8 and 14 micrometers, wherein the set of filters is formed of:
• an optical filter formed on a first surface of the window and attenuating the incident radiation in a first interval of the wavelength range between 2 micrometers and X micrometers, X being between 2 and 8 micrometers, and transmitting the incident radiation in the wavelength range between X and 14 micrometers;
• and
• a periodic diffraction grating formed on a second surface of the window and carrying out a reflective diffraction of the incident radiation in a second interval of the wavelength range between X and 8 micrometers, and transmitting the incident radiation in the wavelength range between 8 and 14 micrometers.