Abstract
A series of long-range plasmonic waveguides based on a thin three-layer Al2O3/gold/Al2O3 film operating in the visible spectral range have been studied experimentally and theoretically. For long-range plasmonic waveguides having identical structure but different lengths, the propagation length of plasmonic waves was determined to be $\text{250} \pm \text{15} \mu {\text{m}}$ at $\lambda = \text{765} {\text{nm}}$ and was in a very good agreement with the theoretical value obtained through numerical modeling. The demonstrated propagation length is the highest one for the gold film-based plasmonic waveguides described in the literature for a uniform (non-photonic-crystal) substrate in the UV, visible, and near IR (up to $\text{1} \mu {\text{m}}$ ) spectral ranges, which is due to high technological quality of the fabricated waveguides and optimized three-layer structure. The proposed waveguides could find applications in optical interconnects and guided-wave optical sensors.
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