Unveiling the mode structure of terahertz oversized electrically-thin-AgI-lined cylindrical waveguides Via near-field time-domain microscopy

Author

Navarro-Cia, M. ; Bledt, C.M. ; Vitiello, M.S. ; Beere, H.E. ; Ritchie, D.A. ; Harrington, James A. ; Mitrofanov, Oleg

Author_Institution

Dept. Electron. & Electr. Eng., Univ. Coll. London, London, UK

fYear

2013

fDate

8-12 April 2013

Firstpage

3366

Lastpage

3368

Abstract

The modal composition and dispersion of a 80-mm-long 1 μm-thick silver iodide (AgI) coated metallic cylindrical waveguide is unveiled by terahertz (THz) near-field time-domain microscopy. We demonstrate that the coating is not thick enough to develop the low-loss HE₁₁ mode, but may allow a robust discrimination between the TE₀₁ mode and the rest of the modes. The methodology shown here based on near-field time-domain microscopy along with numerical electromagnetic modeling allows comprehensive waveguide mode characterization.

Keywords

antireflection coatings; circular waveguides; optical microscopy; optical waveguides; silver compounds; AgI; TE₀₁ mode; electrically-thin-silver iodide-lined cylindrical waveguides; electromagnetic modeling; low-loss HE₁₁ mode; metallic cylindrical waveguide; modal composition; modal dispersion; mode structure; near-field time-domain microscopy; size 1 mum; size 80 mm; waveguide mode characterization; Coatings; Hollow waveguides; Microscopy; Optical waveguides; Probes; Time-domain analysis; multimode propagation; oversized waveguide; terahertz; time-domain microsocpy;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation (EuCAP), 2013 7th European Conference on

Conference_Location

Gothenburg

Print_ISBN

978-1-4673-2187-7

Electronic_ISBN

978-88-907018-1-8

Type

conf

Filename

6546936