Channel plasmon-polariton guiding by subwavelength metal grooves

Abstract:

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 μ m) and well-confined (mode width≅ 1.1 μ m) CPP guiding along a triangular 0.6 μ m-wide and 1 μ m-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.

Año de publicación:

2005

Keywords:

Fuente:

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