City Research Online

Abstract

Designing low-loss waveguides for terahertz waves is challenging as most materials are very lossy in this frequency band. Most scientists simply consider transmitting the waves through low-loss air, which however also has its own difficulties as index-guiding is not possible. In this paper, we report on the design of low-loss waveguides for terahertz waves and associated results by using a finite element leaky mode solver. These results show that waveguides designed using ARROW (anti-resonant reflecting optical waveguide) approach yield a low combined absorption and leakage loss down to only 0.05dB/cm for the q-TE00 fundamental mode using realistic values of refractive index at 1 THz operating frequency. The structure employs rectangular hollow-core and low-density polyethylene/air anti-resonant reflecting bilayers, which can be easily fabricated. These results are compared with those of other structures, i.e., a photonic crystal fiber-like structures using the same materials with rectangular holes, which is shown to give a higher loss of 3dB/cm and a suspended air-core waveguide with TOPAS vein offering a loss of 1dB/cm.

Publication Type:	Article
Additional Information:	Electronic version of an article published as Journal of Nonlinear Optical Physics and Materials, Volume 27, No. 03, 1850029 https://doi.org/10.1142/S0218863518500297 © World Scientific Publishing Company https://www.worldscientific.com/worldscinet/jnopm.
Publisher Keywords:	Terahertz waves, terahertz waveguides, finite element method, hollow-core waveguide, anti-resonant reflecting optical waveguide, ARROW, mode solver, leaky modes
Subjects:	Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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