Lezec et al apply far-field interferometry to measure properties of surface waves

F. Kalkum, G. Gay, O. Alloschery, J. Weiner, H.J. Lezec, Y.Xie, and M. Mansuripur (2007) Surface-wave interferometry on single subwavelength slit-groove structures fabricated on gold films. Optics Express, 15(5): 2613-2621, 5 March 2007. CaltechAUTHORS