Directional coupling in channel plasmon-polariton waveguides | Zendy

Vladimir A. Zenin | Zendy; Valentyn S. Volkov | Zendy; Zhanghua Han | Zendy; Sergey I. Bozhevolnyi | Zendy; Éloïse Devaux | Zendy; Thomas W. Ebbesen | Zendy

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Directional coupling in channel plasmon-polariton waveguides

Author(s) -

Vladimir A. Zenin,

Valentyn S. Volkov,

Zhanghua Han,

Sergey I. Bozhevolnyi,

Éloïse Devaux,

Thomas W. Ebbesen

Publication year - 2012

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.20.006124

Subject(s) - optics , materials science , surface plasmon polariton , wavelength , plasmon , polariton , coupling (piping) , power dividers and directional couplers , surface plasmon , electric field , groove (engineering) , optoelectronics , offset (computer science) , physics , quantum mechanics , computer science , metallurgy , programming language

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.

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