Terahertz dielectric waveguides

Atakaramians, Shaghik; Afshar, V Shahraam; Monro, Tanya M.; Abbott, Derek

doi:10.1364/aop.5.000169

Cited by 314 publications

(154 citation statements)

References 134 publications

(268 reference statements)

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“…As the signal frequency moves deeper into the THz region, the high Ohmic loss of metals and dielectric material absorption make many traditional waveguides and fibers unsuitable for the low-loss long-distance guidance of THz waves [ 6 ], [ 7 ], including hollow metallic waveguide [8], [9], coaxial cable [ 10 ], microstrip [ 11 ], coplanar waveguide [ 12 ], substrate integrated waveguide [13], [14], and optical fiber [15].…”

mentioning

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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mentioning

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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“…In this regard, this manuscript is devoted to the investigation of the light scattering by metalcoated dielectric nanocylinders periodically distributed along the cylindrical surface. Authors believe that these studies could find practical application in the analyses of optical ring resonators [21,22], cylindrical THz waveguides [23][24][25] and Plasmonic Crystals having cylindrical configuration. The rigorous formulation proposed in the manuscript uses T-matrix of a circular scatterer in isolation [26,27] and it is taking into account all cylindrical Floquet modes and their interactions through the scattering between the nanocylinders periodically distributed along a circular ring [20,28,29].…”

Section: Introductionmentioning

confidence: 99%

Scattering of Light by the Metal-Coated Dielectric Nanocylinders With Angular Periodicity

Jandieri

Yasumoto²,

Liu³

et al. 2016

PIER M

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Abstract-Scattering of light by metal-coated dielectric nanocylinders periodically distributed along a cylindrical surface is investigated both theoretically and numerically. The structure is under the authors' interest because of its practical application in design and fabrication of plasmonic devices such as plasmonic ring resonators, Plasmonic Crystals and THz waveguides. The method is based on the T-matrix approach and the field expansion into the cylindrical Floquet modes. The method is rigorous, straightforward and can be easily applied to various cylindrical configurations with different types and locations of the excitation sources. Scattering cross section and absorption cross section of three and four silver (Ag) coated-dielectric nanocylinders periodically situated along a cylindrical surface are studied. Near field distributions are investigated at particular wavelengths corresponding to the resonance wavelengths in the spectral responses. Special attention is paid to the unique and interesting phenomena characterizing the cylindrical structure composed of the metal-coated nanocylinders such as: a ) localization of the field at the outer and inner interfaces of the metal-coated nanocylinders; b) excitement of the field in the gap region between the nanocylinders through the coupled plasmon resonance and c) strong confinement of the field inside the cylindrical structure. Detailed investigations have shown that unique phenomena characterizing the cylindrical configurations of the nanocylinders can be realized using a relatively simple structure composed of three nanocylinders and there is no need to further increase a number of the scatterers (nanocylinders).

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“…T ERAHERTZ waveguides have attracted significant attention in recent years due to their potential applications in a variety of areas, such as pharmaceutical quality control [1], [2], medical diagnostics [3], [4], imaging [5]- [7] and sensory applications [8]- [10]. Terahertz radiation (THz), which is situated between infrared and microwave radiation on the electromagnetic spectrum, typically refers to frequencies from 100 GHz to 30 THz [3], [4], [11] [12].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Plasmonics Slot THz Waveguide for Subwavelength Field Confinement and Crosstalk Between Two Waveguides

Xiao

Wei

Yang

et al. 2017

IEEE J. Select. Topics Quantum Electron.

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Abstract-The slot waveguide has attracted considerable attention because of its ability to confine and guide electromagnetic energy at the subwavelength scale beyond the diffraction limit. We propose a novel terahertz slot waveguide structure to achieve a better tradeoff between propagation length and field confinement capacity, the novel waveguide consisting of a two slot structure. The performances of terahertz waveguides were investigated using the finite-element method. The results demonstrated that the hybrid slot waveguide (HSW) provides significantly enhanced field confinement in low index slot regions: more than five times that of traditional low index slot waveguides (LISWs). An optimized HSW structure was achieved by tuning the tradeoff between mode confinement and propagation length. We also showed that its integration in conventional planar waveguide circuits was greatly improved compared with the LISWs, by comparing their crosstalk. The proposed new HSW structure has great potential to enable THz production of compact integration and could lead to true semiconductor-basedTHz applications with high performance.

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Terahertz dielectric waveguides

Cited by 314 publications

References 134 publications

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

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

Scattering of Light by the Metal-Coated Dielectric Nanocylinders With Angular Periodicity

Hybrid Plasmonics Slot THz Waveguide for Subwavelength Field Confinement and Crosstalk Between Two Waveguides

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