Measurements of modal symmetry in subwavelength plasmonic slot waveguides

Spasenovic, M.; van Oosten, D.; Verhagen, E.; Kuipers, L.
November 2009
Applied Physics Letters;11/16/2009, Vol. 95 Issue 20, p203109
Academic Journal
We excite a guided plasmonic mode in slot waveguides of subwavelength width. With a phase- and polarization-sensitive near-field microscope, we measure the electric field of the mode for a range of slot widths from 40 to 120 nm. The field is experimentally found to be antisymmetric across the slot gap. Numerical calculations confirm this symmetry. Calculations also show a confinement of the field to a lateral size ∼10 times smaller than the free-space wavelength.


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