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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 6 — Jun. 13, 2007

Flexible terahertz fiber optics with low bend-induced losses

Takahiro Ito, Yuji Matsuura, Mitsunobu Miyagi, Hiroaki Minamide, and Hiromasa Ito  »View Author Affiliations


JOSA B, Vol. 24, Issue 5, pp. 1230-1235 (2007)
http://dx.doi.org/10.1364/JOSAB.24.001230


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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 TE 11 mode shows a high coupling coefficient to linearly polarized light. Also the TE 11 mode brings less mode conversion to high-order modes than the TE 01 mode giving the lowest loss. We measured transmission losses in the terahertz region of hollow waveguides with inner silver coating; the losses were 7.5 8 dB m at the wavelengths from 190 250 μ m for waveguides with an inner diameter of 1 mm . These losses coincide well with theoretical ones, and this shows that in these waveguides, the TE 11 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 1 mm is sufficiently small and flexible for use in endoscopic applications.

© 2007 Optical Society of America

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2310) Fiber optics and optical communications : Fiber optics
(350.4010) Other areas of optics : Microwaves

ToC Category:
THz Domain

History
Original Manuscript: November 10, 2006
Revised Manuscript: December 14, 2006
Manuscript Accepted: December 29, 2006
Published: April 17, 2007

Virtual Issues
Vol. 2, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Takahiro Ito, Yuji Matsuura, Mitsunobu Miyagi, Hiroaki Minamide, and Hiromasa Ito, "Flexible terahertz fiber optics with low bend-induced losses," J. Opt. Soc. Am. B 24, 1230-1235 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josab-24-5-1230

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