Bendable, low-loss Topas fibers for the terahertz frequency range

Kristian Nielsen, Henrik K. Rasmussen, Aurèle J.L. Adam, Paul C M. Planken, Ole Bang, Peter Uhd Jepsen

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We report on a new class of polymer photonic crystal fibers for low-loss guidance of THz radiation. The use of the cyclic olefin copolymer Topas, in combination with advanced fabrication technology, results in bendable THz fibers with unprecedented low loss and low material dispersion in the THz regime.We demonstrate experimentally how the dispersion may be engineered by fabricating both high- and low-dispersion fibers with zero-dispersion frequency in the regime 0.5-0.6 THz. Near-field, frequency resolved characterization with high spatial resolution of the amplitude and phase of the modal structure proves that the fiber is single-moded over a wide frequency range, and we see the onset of higher-order modes at high frequencies as well as indication of microporous guiding at low frequencies and high porosity of the fiber. Transmission spectroscopy demonstrates low-loss propagation (<0.1 dB/cm loss at 0.6 THz) over a wide frequency range
Original languageEnglish
JournalOptics Express
Issue number10
Pages (from-to)8592-8601
Publication statusPublished - 2009

Bibliographical note

This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


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