Abstract
The optical guided modes in the plane array of metallic cylindrical waveguides are considered. The case of the arbitrary propagation constant β is studied. Thus far, only the case β = 0 has been investigated in literature. We have revealed that just for β ≠ 0, the new branch of guided modes appears. The case of silver waveguides is investigated in details. It is found that, for sufficiently small β, the dispersion curve for the guided mode is located below the transmission window. We found the conditions for which the dispersion curve with β ≠ 0 is located completely within the transmission window. The multiple scattering formalism based on the expansion in the vector cylinder harmonics is employed. The cases of copper and gold waveguides are discussed briefly.
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