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3D-Printed Broadband Dielectric Tube Terahertz Waveguide with Anti-Reflection Structure

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Abstract

We demonstrate broadband, low loss, and close-to-zero dispersion guidance of terahertz (THz) radiation in a dielectric tube with an anti-reflection structure (AR-tube waveguide) in the frequency range from 0.2 to 1.0 THz. The anti-reflection structure (ARS) consists of close-packed cones in a hexagonal lattice arranged on the outer surface of the tube cladding. The feature size of the ARS is in the order of the wavelength between 0.2 and 1.0 THz. The waveguides are fabricated with the versatile and cost efficient 3D-printing method. Terahertz time-domain spectroscopy (THz-TDS) measurements as well as 3D finite-difference time-domain simulations (FDTD) are performed to extensively characterize the AR-tube waveguides. Spectrograms, attenuation spectra, effective phase refractive indices, and the group-velocity dispersion parameters β 2 of the AR-tube waveguides are presented. Both the experimental and numerical results confirm the extended bandwidth and smaller group-velocity dispersion of the AR-tube waveguide compared to a low loss plain dielectric tube THz waveguide. The AR-tube waveguide prototypes show an attenuation spectrum close to the theoretical limit given by the infinite cladding tube waveguide.

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Acknowledgments

We would like to thank the New Zealand eScience Infrastructure (NeSI) Computational Science Team for their support with the FDTD simulations on the NeSi Pan Cluster and the Dodd-Walls Centre for financial assistance.

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Authors and Affiliations

  1. Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics, The University of Auckland, Private Bag 92019, Auckland, New Zealand

    Dominik Walter Vogt & Rainer Leonhardt

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  1. Dominik Walter Vogt
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  2. Rainer Leonhardt
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Correspondence to Dominik Walter Vogt.

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Vogt, D.W., Leonhardt, R. 3D-Printed Broadband Dielectric Tube Terahertz Waveguide with Anti-Reflection Structure. J Infrared Milli Terahz Waves 37, 1086–1095 (2016). https://doi.org/10.1007/s10762-016-0296-3

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  • DOI: https://doi.org/10.1007/s10762-016-0296-3

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