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Phys Rev Lett. 2002 Oct 28;89(18):186801. Epub 2002 Oct 10.

Localization and waveguiding of surface plasmon polaritons in random nanostructures.

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  • 1Institute of Physics, Aalborg University, Pontoppidanstroede 103, DK-9220 Aalborg Øst, Denmark.


We propose to use channels in strongly scattering nonabsorbing random media for guiding electromagnetic waves, and demonstrate this concept using near-field microscopy of surface plasmon polaritons (SPP's) propagating along the gold film surface covered with randomly located scatterers. In the wavelength range of 725-765 nm, we observe complete inhibition of the SPP propagation inside the random structures composed of approximately 50-nm-wide gold bumps and their clusters with the density of 50 microm(-2), as well as well-defined SPP guiding along corrugation-free 2- and 4-microm-wide channels.

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