Device for detecting electromagnetic radiation possessing a hermetic encapsulating structure comprising an exhaust vent

A device for detecting electromagnetic radiation, comprising:

• a substrate;
• at least one thermal detector, placed on the substrate, including a membrane suitable for absorbing the radiation to be detected, which membrane is suspended above the substrate and thermally insulated therefrom by thermally insulating holding elements;
• and
• an encapsulating structure encapsulating said at least one thermal detector, including an encapsulating layer extending around and above said at least one thermal detector so as to define with the substrate a cavity wherein said at least one thermal detector is located,
• wherein the encapsulating layer comprises at least one through-orifice as an exhaust vent, said exhaust vent being placed so that at least one thermal detector has a single exhaust vent located facing a corresponding absorbing membrane, and
• wherein said absorbing membrane, facing said exhaust vent, includes a through-orifice located perpendicular to said exhaust vent and of a size equal to or larger than that of said exhaust vent.