We report polarization tomography experiments on metallic nanohole arrays with square and hexagonal symmetry. As a main result we find that a fully polarized input beam is partly depolarized after transmission through a nanohole array. This loss of polarization coherence is found to be anisotropic; i.e., it depends on the polarization state of the input beam. The depolarization is ascribed to a combination of two factors: (i) the nonlocal response of the array as a result of surface-plasmon propagation and (ii) the non-plane-wave nature of a practical input beam.
© 2005 Optical Society of America
Erwin Altewischer, Cyriaque Genet, Martin P. van Exter, J. P. Woerdman, Paul F. A. Alkemade, Arjan van Zuuk, and Emile W. J. M. van der Drift, "Polarization tomography of metallic nanohole arrays," Opt. Lett. 30, 90-92 (2005)