A component for detecting electromagnetic radiation includes a detection structure and a supply circuit for the detection structure. The detection structure includes a transistor associated with an absorbent element for detecting the rise in temperature of the absorbent element when electromagnetic radiation is absorbed. The supply circuit is configured to supply the detection structure in operation such that a channel zone of the structure has, at the location of one of its first and the second faces, a layer having carriers of a second type of conductivity opposite to a first type of conductivity of a source zone and of a drain zone of the transistor, the layer being referred to as blocking layer.