Abstract
We investigate characteristics of gold metal strip waveguides based on long range surface plasmon polaritons (LRSPPs) along thin metal strips embedded in a polymer for practical applications at the telecommunication wavelengths of 1.31 and 1.55μm. Guiding properties of the gold strip waveguides are theoretically and experimentally evaluated with the limited thickness and width up to ∼20nm and ∼10μm, respectively. The lowest propagation loss of ∼1.4dB/cm is obtained with a 14.5-nm-thick and 2-μm-wide gold strip at 1.55μm. With a single-mode fiber, the lowest coupling loss of ∼0.4dB/facet is achieved with a 14.5-nm-thick and 5-μm-wide gold strip at 1.55μm. The lowest insertion losses are obtained 8–9dB with 1.5cm-long gold strips of a limited thickness and width at both the wavelengths. We demonstrate a 10Gbps optical signal transmission via the LRSPP waveguide with a 14nm-thick, 2.5μm-wide, and 4cm-long gold strip. These LRSPP waveguides have potential applications for optical interconnects and communications.
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