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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 6124–6134

Directional coupling in channel plasmon-polariton waveguides

Vladimir A. Zenin, Valentyn S. Volkov, Zhanghua Han, Sergey I. Bozhevolnyi, Eloïse Devaux, and Thomas W. Ebbesen  »View Author Affiliations

Optics Express, Vol. 20, Issue 6, pp. 6124-6134 (2012)

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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.

© 2012 OSA

OCIS Codes
(230.7380) Optical devices : Waveguides, channeled
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

Original Manuscript: January 31, 2012
Revised Manuscript: February 24, 2012
Manuscript Accepted: February 24, 2012
Published: February 29, 2012

Vladimir A. Zenin, Valentyn S. Volkov, Zhanghua Han, Sergey I. Bozhevolnyi, Eloïse Devaux, and Thomas W. Ebbesen, "Directional coupling in channel plasmon-polariton waveguides," Opt. Express 20, 6124-6134 (2012)

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