Open AccessModal characteristics of antiresonant reflecting pipe waveguides for terahertz waveguiding
Author(s) -
Chintu Lai,
Borwen You,
Ja Yu Lu,
Tze An Liu,
Jinlong Peng,
ChiKuang Sun,
HaoChin Chang
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.000309
Subject(s) - cladding (metalworking) , optics , materials science , terahertz radiation , refractive index , dielectric , modal , electric field , attenuation , core (optical fiber) , total internal reflection , optoelectronics , physics , composite material , quantum mechanics
Modal characteristics of the THz pipe waveguide, which is a thin pipe consisting of a large air core and a thin dielectric layer with uniform but low index, are investigated. Modal indices and attenuation constants are calculated for various core diameters, cladding thicknesses, and cladding refractive indices. Numerical results reveal that the guiding mechanism of the leaky core modes, which transmit most of the power in the air-core region, is that of the antiresonant reflecting guiding. Moreover, modal patterns including modal intensity distributions and electric field vector distributions are shown for the fundamental and higher order modes. Experiments using time-domain spectroscopy with PMMA pipes also confirm the antiresonant reflecting guiding mechanism.