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Phys Rev Lett. 2005 Jul 22;95(4):046802. Epub 2005 Jul 22.

Channel plasmon-polariton guiding by subwavelength metal grooves.

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Department of Physics and Nanotechnology, Aalborg University, Denmark.


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 approximately 100 microm) and well-confined (mode width approximately 1.1 microm) CPP guiding along a triangular 0.6 microm-wide and 1 microm-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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