Bolometric detection device with antenna and optimized cavity for millimetric or sub-millimetric electromagnetic waves, and manufacturing process for this device

Bolometric detection device with antenna and optimized cavity for millimetric or sub-millimetric electromagnetic waves, and manufacturing process for this device. This device, preferably made from a double type substrate, is applicable particularly in astrophysics and comprises at least one bolometer comprising an antenna, a resistive load, a thermometric element and a resonant cavity, surrounded by a material with optical index n. The thickness of the cavity is less than λ/(4n), where λ is the average wavelength of the waves to be detected.