Interior-surface acoustic waveguiding in capillaries

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Abstract
Capillary tubing, used as a waveguide for surface acoustic waves confined to the interior surface, is shown to be a guiding structure that has a number of properties useful for long‐delay‐line applications. Very clean rf pulse transmission has been achieved, with spurious bulk modes stripped away by absorption at the outer surface. Low dispersion is available with bore diameters of a few Rayleigh wavelengths. In a fused silica structure flame‐drawn to a half‐meter length, the propagation loss was experimentally found to be limited by material bulk attenuation constants.