We report on realization of channel plasmon-polariton (CPP) propagation along a subwavelength metal groove. Using imaging with a near-field microscope and end-fire coupling with a tapered fiber connected to a tunable laser at telecommunication wavelengths (1425--1620 nm), we demonstrate low-loss (propagation length ~100 μm) and well-confined (mode width 1.1 μm) CPP guiding along a triangular 0.6 μm-wide and 1 μm-deep groove in gold. We develop a simple model based on the effective-index method that accounts for the main features of CPP guiding and provides a clear physical picture of this phenomenon.
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Bozhevolnyi et al. (2005) studied this question.
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