Measurements of modal symmetry in subwavelength plasmonic slot waveguides

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 g...

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Veröffentlicht in:Applied physics letters 2009-11, Vol.95 (20)
Hauptverfasser: Spasenović, M., van Oosten, D., Verhagen, E., Kuipers, L.
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3254246