An optical component for an attenuated total reflection interferometric imaging device, which includes:



a planar waveguide, especially delimited by a front face and a rear face parallel to each other;
an injection zone, comprising two input facets, each extending from a side face of the planar waveguide, configured to separate an initial light beam into two sub-beams each deflected in a respective direction when they enter the planar waveguide; and
an extraction zone, including two output facets, configured to receive the two sub-beams, and to deflect the same when they exit the planar waveguide,
the optical component being configured so that the two sub-beams can interfere with each other after emerging out of the planar waveguide.