Enhanced coupling of terahertz radiation to cylindrical wire waveguides

Deibel, Jason A.; Wang, Kanglin; Escarra, Matthew D.; Mittleman, Daniel M.

doi:10.1364/opex.14.000279

Cited by 130 publications

(75 citation statements)

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“…Of these modes, only a single, radially polarized mode survives after propagating along the length of the wire for several cm's. While it has been shown that this scattering technique is not the most efficient method of coupling terahertz radiation to a wire waveguide [13], it is a simple and effective method, and is adequate for these measurements. The surface wave propagates towards the end of the wire where it is partially scattered into free space.…”

Section: Methodsmentioning

confidence: 99%

Frequency-dependent radiation patterns emitted by THz plasmons on finite length cylindrical metal wires

Deibel¹,

Berndsen²,

Wang³

et al. 2006

Opt. Express

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Abstract:We report on the emission patterns from THz plasmons propagating towards the end of cylindrical metal waveguides. Such waveguides exhibit low loss and dispersion, but little is known about the dynamics of the terahertz radiation at the end of the waveguide, specifically in the near-and intermediate-field. Our experimental results and numerical simulations show that the near-and intermediate-field terahertz spectra, measured at the end of the waveguide, vary with the position relative to the waveguide. This is explained by the frequency-dependent diffraction occurring at the end of the cylindrical waveguide. Our results show that near-field changes in the frequency content of THz pulses for increasing wire-detector distances must be taken into account when studying surface waves on cylindrical waveguides.

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Section: Methodsmentioning

confidence: 99%

Frequency-dependent radiation patterns emitted by THz plasmons on finite length cylindrical metal wires

Deibel¹,

Berndsen²,

Wang³

et al. 2006

Opt. Express

Self Cite

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“…The same near-field edge-coupled source can be used as an alternative method (to [12][13][14]) for exciting waveguides without THz optics.…”

Section: Introductionmentioning

confidence: 99%

THz-TDS using a photoconductive free-space linear tapered slot antenna transmitter

Smith¹,

Jooshesh²,

Zhang³

et al. 2017

Opt. Express

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A near-field edge-coupled photoconductive free-space linear tapered slot antenna has been constructed as a planar alternative to the standard photoconductive switch coupled to a silicon substrate lens. The temporal response along the optical axis is investigated to ensure the structure itself does not introduce pulse distortion which would fundamentally limit the usefulness of the structure. Experimental results show that a 1.6 THz bandwidth with a ≈50dB dynamic range is achievable with the new structure which is comparable to our reference experiment with a standard silicon substrate lens. The investigated structure has the added benefit of a potential substantial physical size reduction and can also be used to excite waveguides in the near-field.

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“…On the other hand, metallic waveguides such as single wire waveguides [6,7], parallel plate waveguides [8] and two-wire waveguides [9][10][11][12] support the propagation of single cycle THz pulses with low dispersion due to their (almost) non-dispersive transverse electromagnetic mode (TEM). Single wire waveguides carrying radially polarized TEM modes are difficult to excite from commonly available linearly polarized THz sources -such as photoconductive (PC) antennas -due to mode mismatch, and hence it is necessary to make use of a radially polarized THz radiation source [13]. Furthermore, single-wire waveguides are featured by high bending losses, which limit the flexibility of such a solution.…”

Section: Introductionmentioning

confidence: 99%

Active Terahertz Two-wire Waveguides

et al. 2014

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Abstract:We demonstrate, by generating a THz electric field directly within the guiding structure, an active two-wire waveguide operating in the terahertz (THz) range of wavelengths. We compare the energy throughput of the active configuration with that of a radiatively coupled semi-large photoconductive antenna, in which the radiation is generated outside the waveguide, reporting a 60 times higher energy throughput for the same illumination power and applied voltage. This novel, active waveguide design allows to have efficient coupling of the THz radiation in a dispersion-less waveguide without the need of involved radiative coupling geometries.

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Enhanced coupling of terahertz radiation to cylindrical wire waveguides

Cited by 130 publications

References 0 publications

Frequency-dependent radiation patterns emitted by THz plasmons on finite length cylindrical metal wires

Frequency-dependent radiation patterns emitted by THz plasmons on finite length cylindrical metal wires

THz-TDS using a photoconductive free-space linear tapered slot antenna transmitter

Active Terahertz Two-wire Waveguides

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