Directional coupling in channel plasmon-polariton waveguides

Volodymyr Zenin, Valentyn S. Volkov, Zhanghua Han, Sergey I. Bozhevolnyi, Eloïse Devaux, Thomas W. Ebbesen

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We investigate directional couplers (DCs) formed by channel plasmon-polariton (CPP) waveguides (CPPWs). DCs comprising 5-µm-offset S-bends and 40-µm-long parallel CPPWs with different separations (0.08, 0.25, 0.5 and 2 µm) between V-groove channels are fabricated by using a focused ion-beam (FIB) technique in a 2-μm-thick gold film and characterized at telecom wavelengths (1425-1630 nm) with near-field optical microscopy. Experimental results reveal strong coupling, resulting in approximately equal power splitting between DC-CPPWs, for small CPPW separations (0.08 and 0.25 µm). The coupling gradually deteriorates with the increase of separation between V-grooves and practically vanishes for the separation of 2 µm. The DC-CPPW characteristics observed are found in good agreement with finite-element method (implemented in COMSOL) simulations.
Original languageEnglish
JournalOptics Express
Issue number6
Pages (from-to)6124-6134
Publication statusPublished - 2012


  • Waveguides, channeled
  • Surface plasmons
  • Directional coupling


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