Surface plasmon microscope has a high resolution with interferometer heterodyne in radial polarization.

摘要

The present invention relates to a microscope surface plasmon scanning at a high resolution (lg) comprising a source of coherent light, and a coupling medium and of the confinement of a surface plasmon comprising a lens (0, om) to a large numerical aperture, an oil by immersion (hi) and a strip of glass (gs). A metal layer (ms) covers a surface of the strip of glass (gs). the microscope also comprises an interferometer of twyman - green in heterodyne mode is placed between the light source and the coupling medium as well as means of scanning (pl1, pl2, ec) of the metal layer with the aid of a light beam, and the detection means (pd) of the beam coming from the interferometer connected to processing means (s, f, dtec, comp) and the formation of an image on the basis of this beam. According to the invention, at least one linear polarization converter in the radial polarization (cp) of the light beams (l) emitted by the light source (lg) is disposed between the light source and the interferometer.