Pyroelectric sensor with an electromagnetic shielding including a composite material

A heat pattern sensor comprising a matrix of pixels, each pixel comprising at least one pyroelectric capacitance which is formed by a pyroelectric material portion arranged between a so-called charge collection electrode and a so-called reference electrode, and the matrix of pixels comprising, superimposed above a substrate:

• a stage of charge collection electrodes, comprising the charge collection electrodes of each of the pixels;
• and
• a stage including a pyroelectric material, comprising the pyroelectric material portions of each of the pixels;
• the matrix of pixels further comprising a so-called electromagnetic shielding stage, electrically conducting, situated between the stage including a pyroelectric material and a contact surface to apply thereto an object to image;
• wherein the electromagnetic shielding stage includes a shielding layer which comprises nanowires and/or nanotubes lying in a medium designated surrounding medium, said nanowires and/or nanotubes each being constituted of a material having a thermal conductivity greater than that of said surrounding medium, and wherein a ratio between a distribution pitch of the pixels of the matrix of pixels and a thickness of the shielding layer is greater than or equal to 20.