Terahertz waveguides

Gallot, Guilhem; Jamison, S. P.; McGowan, R.W.; Grischkowsky, D.

doi:10.1364/josab.17.000851

Cited by 411 publications

(233 citation statements)

References 7 publications

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“…[1][2][3][4] Among various types of THz waveguides, parallelplate metal waveguides have attracted considerable attention due to the low loss and low group velocity dispersion in the transverse-electromagnetic ͑TEM͒ mode propagation. [2][3][4] For a parallel-plate copper waveguide with 100 m plate separation, the typical frequency-dependent amplitude absorption coefficient caused by the finite conductivity of copper is approximately 0.06 cm −1 at 0.5 THz, [2][3][4] and is proportional to the square root of frequency and inversely proportional to the plate separation.…”

Section: Thz Sommerfeld Wave Propagation On a Single Metal Wirementioning

confidence: 99%

“…1͑b͒ average power of 10 mW, enabling the measurement of the propagated THz pulses, by changing the relative time delay between the excitation and detection pulses. [1][2][3][4][5] As shown in Fig. 1͑c͒, the wire is supported by two tightly fitting Teflon disks of 3 mm thickness.…”

Section: Thz Sommerfeld Wave Propagation On a Single Metal Wirementioning

confidence: 99%

“…2͑c͒, showing the very low propagation loss compared with other types of THz waveguides. [1][2][3][4][5] For comparison, we plot as the solid line the calculated amplitude absorption coefficient for the Sommerfeld wave, and as the dashed line the calculated absorption for the TEM mode of the corresponding air-filled copper coaxial waveguide. This coaxial waveguide would have an inner diameter of 0.52 mm and an outer diameter of 9 mm, giving the same a / r field dependence and boundaries as shown in Fig.…”

Section: Thz Sommerfeld Wave Propagation On a Single Metal Wirementioning

confidence: 99%

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THz Sommerfeld wave propagation on a single metal wire

Jeon¹,

Zhang²,

Grischkowsky³

2005

Applied Physics Letters

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273

171

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We report an experimental and theoretical study of THz Sommerfeld wave propagation on a single copper wire. THz pulses are optoelectronically generated and launched onto 0.52-mm-diam copper wire, and the guided THz pulses are detected at the end of the wire by a standard photoconductive antenna. Very low attenuation and group velocity dispersion are observed, and the measured radial field amplitude of the Sommerfeld wave is inversely proportional to the radial distance. These results are consistent with theoretical predictions. Experimental results from curved wires show the weakly guiding property of the THz Sommerfeld wave, which will limit its applications.

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Section: Thz Sommerfeld Wave Propagation On a Single Metal Wirementioning

confidence: 99%

Section: Thz Sommerfeld Wave Propagation On a Single Metal Wirementioning

confidence: 99%

Section: Thz Sommerfeld Wave Propagation On a Single Metal Wirementioning

confidence: 99%

See 1 more Smart Citation

THz Sommerfeld wave propagation on a single metal wire

Jeon¹,

Zhang²,

Grischkowsky³

2005

Applied Physics Letters

Self Cite

273

171

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“…However, the receiver used is not sensitive to modes whose field integrated over the sampled spatial region is zero. 10 Therefore, the field detected is essentially the TEM mode of the guide. Thus, the location of the excitation spot relative to the device electrodes is an important parameter in determining the number and amplitude of guided modes of the transmitter that are excited, however the higher-order modes are not detected.…”

Section: School Of Electrical and Computer Engineeringmentioning

confidence: 99%

Parallel plate THz transmitter

Coleman

Grischkowsky

2004

Applied Physics Letters

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A THz transmitter that directly excites the guided wave modes of a dielectric filled parallel plate waveguide is demonstrated. When coupled to free space, the transmitter yields a large peak time-domain THz signal. The device yields significant signal amplitudes with varying output spectra with and without a bias field applied. This transmitter provides powerful direct excitation of guided wave modes and is the next step toward an integrated guided wave transverse-electromagnetic mode THz bandwidth device.

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“…In the THz frequency range, waveguides have been traditionally fabricated from metals such as copper, brass, and stainless steel with rectangular, square, and circular cross sections giving total losses at 1 THz as low as 0.7 cm −1 (or about 0.3 dB/mm) [1][2][3]. Attenuation performances of 1.5 m −1 (or about 0.0065 dB/mm) between 1 and 2 THz have also been obtained [4] with ferroelectric.…”

Section: Introductionmentioning

confidence: 99%

Comparison and Optimization of Dispersion, and Losses of Planar Waveguides on Benzocyclobutene (Bcb) at THZ Frequencies: Coplanar Waveguide (Cpw), Microstrip, Stripline and Slotline

Cao¹,

Grimault-Jacquin

Aniel³

2013

PIER B

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Abstract-This paper proposes an investigation in the terahertz (THz) frequency range of the dispersion and an individual quantitative treatment of the losses of the most classical microwave waveguides (coplanar, slotline, microstrip and stripline) numerically led in three dimensions (3D). An original strategy has been used to quantify radiation losses associated with leaky modes. A very low THz permittivity polymer (benzocyclobutene (BCB)) was used as a very convenient substrate to be easily grafted as a THz environment of integrated passive or/and active devices. Direct comparisons of the losses and the dispersion have been performed following two criteria: a constant characteristic impedance Z c fixed at 100 Ω and a constant effective width W eff fixed at 30 µm. The best waveguides are microstrip (α T = 2.52 dB/mm for Z c = 100 Ω and for W/H = 35/50 µm (with W the strip width and H the substrate height) and α T = 2.29 dB/mm for W eff = 30 µm at 1 THz with H = 30 µm) and stripline (with quasi-null radiation losses and the best quality factor Q T = 63 for Z c = 100 Ω). The large dispersion and radiation losses of the slotline (SL) can be reduced with a thick BCB encapsulation to enhance the THz signal. The coplanar waveguide (CPW) remains in a medium position. Besides the parasitic mode (SL) and low Q T problems due to mainly ohmic losses, its major advantage is its planar geometry allowing to an easy circuit integration with THz sources, amplifiers and detectors based on semiconductor. Consequently, these THz studies on BCB microwave standard waveguides open to various perspectives to carry out a broad panel of integrated THz circuits.

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Terahertz waveguides

Cited by 411 publications

References 7 publications

THz Sommerfeld wave propagation on a single metal wire

THz Sommerfeld wave propagation on a single metal wire

Parallel plate THz transmitter

Comparison and Optimization of Dispersion, and Losses of Planar Waveguides on Benzocyclobutene (Bcb) at THZ Frequencies: Coplanar Waveguide (Cpw), Microstrip, Stripline and Slotline

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