Transmission measurements of hollow-core THz Bragg fibers

Dupuis, Alexandre; Stoeffler, Karen; Ung, Bora; Dubois, Charles; Skorobogatiy, Maksim

doi:10.1364/josab.28.000896

Cited by 117 publications

(63 citation statements)

References 40 publications

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“…In addition, using 3D stereolithography, a hollow core Bragg fiber with propagation loss of 52.1 dB/m at 0.18 THz [19] was recently reported. In 2011, two rolled large air-core Bragg fibers were reported which exhibited propagation losses of 18 dB/m at 0.69 THz and 12 dB/m at 0.82 THz, respectively [20]. Recently, tube-lattice fibers fabricated with a fiber drawing technique have been demonstrated, to guide the electromagnetic (EM) fields in the low-loss air core based on the antiresonance effect [21], [22].…”

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confidence: 99%

Low-Loss Asymptotically Single-Mode THz Bragg Fiber Fabricated by Digital Light Processing Rapid Prototyping

Hong

Swithenbank

Greenall

et al. 2018

IEEE Trans. THz Sci. Technol.

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Abstract-In this paper, the design and measurement of a 3D-printed low-loss asymptotically single-mode hollow-core terahertz Bragg fiber is reported, operating across the frequency range from 0.246 to 0.276 THz. The HE11 mode is employed as it is the lowest loss propagating mode, with the electromagnetic field concentrated within the air core as a result of the photonic crystal bandgap behavior. The HE11 mode also has large loss discrimination compared to its main competing HE12 mode. This results in asymptotically single-mode operation of the Bragg fiber, which is verified by extensive simulations based on the actual fabricated Bragg fiber dimensions and measured material parameters. The measured average propagation loss of the Bragg fiber is lower than 5 dB/m over the frequency range from 0.246 to 0.276 THz, which is, to the best of our knowledge, the lowest loss asymptotically single-mode all-dielectric microstructured fiber yet reported in this frequency range, with a minimum loss of 3 dB/m at 0.265 THz.Index Terms-Bragg fiber, electromagnetic propagation, millimeter wave technology, photonic crystals, three-dimensional printing.

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confidence: 99%

Low-Loss Asymptotically Single-Mode THz Bragg Fiber Fabricated by Digital Light Processing Rapid Prototyping

Hong

Swithenbank

Greenall

et al. 2018

IEEE Trans. THz Sci. Technol.

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“…For lower propagation loss and lower group-velocity dispersion, Bragg fiber typically operates in an asymptotically single-mode pattern [3] - [5]. Therefore, a large propagation loss discrimination between the desired operating mode and other unwanted competing modes is required to ensure the single-mode operation of Bragg fiber.…”

Section: Introductionmentioning

confidence: 99%

High-order operating mode selection using second-order bandgap in THz Bragg fiber

Hong

Somjit

Cunningham

et al. 2017

2017 10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies (UCMMT)

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Abstract-This paper demonstrates a novel design technique for single-TE01-mode Bragg fiber using a second-order bandgap achieving signal propagation loss less than 1.2 dB/m from 0.85 THz to 1.15 THz. The TE01 mode intrinsically has a null point in the electric field close to the interface region between the core and the cladding. This makes the TE01 mode preferable to other modes since it shows low signal propagation loss and low electromagnetic interference from cladding defects. Bragg fiber can exhibit a strong mode selectivity as a result of modal-filtering effects. A large loss discrimination between the desired TE01 mode and competing modes can be designed by appropriately tailoring the photonic bandgap.

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“…The reason behind this is the lack of commercially feasible low loss waveguides [11,12]. Previously, various types of waveguides were proposed for the THz wave propagation, such as metallic wires [13], dielectric metal-coated tubes [14], Bragg fibres [15] all-dielectric subwavelength polymer fibres [16] etc. But still these proposed waveguides had to challenge to satisfy flexible, efficient, lowloss transmission of broadband THz waves for long-length delivery.…”

Section: Introductionmentioning

confidence: 99%