  In this letter, a plasmonic dark field microscopy taking advantages of the
polymer loaded surface plasmon polariton waveguide (PLSPPW) is experimentally
demonstrated. The dye molecules (Rhodamine 6G, Rh6G) are doped in the PLSPPW to
launch the plasmonic waves or guided waves. Due to the localized property of
these waves, the near-field optical energy on the surface of PLSPPW can be
scattered into the far-field only in the presence of the objects. The
scattering signals then form the dark-field image of the objects. The proposed
technique just utilizes a chip-scale integrated plasmonic multilayered
structure which is highly compatible with the conventional optical microscopy.
The polymer film involved in the PLSPPW also brings about the merits of small
roughness, good stability and bio-compatibility
