Polarization analysis of propagating surface plasmons in a subwavelength   hole array
  We present angle- and polarization-resolved measurements of the optical transmission of a subwavelength hole array. These results give a (far-field) visualization of the corresponding (near-field) propagation of the excited surface plasmons and allow for a simple analysis of their polarization properties. 
E. Altewischer, M.P. van Exter, J.P. Woerdman