Abstract

We developed a metal hollow waveguide as a flexible delivery medium of terahertz waves. Theoretical evaluation shows that a metal waveguide mainly supports TE modes and that the TE11 mode shows a high coupling coefficient to linearly polarized light. Also the TE11 mode brings less mode conversion to high-order modes than the TE01 mode giving the lowest loss. We measured transmission losses in the terahertz region of hollow waveguides with inner silver coating; the losses were 7.58dBm at the wavelengths from 190250μm for waveguides with an inner diameter of 1mm. These losses coincide well with theoretical ones, and this shows that in these waveguides, the TE11 mode is dominant when a linearly polarized beam is launched into them. The waveguides are flexible because we use a thin-wall glass capillary as the base tubing. Our experiment revealed low additional losses due to bending even when complicated bends were applied to the waveguides. The metal-coated hollow fiber with an inner diameter of 1mm is sufficiently small and flexible for use in endoscopic applications.

© 2007 Optical Society of America

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