Abstract

We report broadband transmissions of terahertz radiations through the air channel of thin-wall pipe. The impacts of the wall thickness and of the refractive index of the material on the transmission window bandwidth are investigated. An extension of the bandwidth by at least 5.5 times is reported with a commercial drinking straw. The salient properties of the antiresonant reflecting guiding mechanism are studied with the terahertz time domain spectroscopy method, including the reduction of the attenuation coefficient of the propagated field by 60 times the material absorption coefficient.

© 2011 Optical Society of America

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References

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2010 (2)

2009 (2)

2008 (2)

J.-Y. Lu, C.-P. Yu, H.-C. Chang, H.-W. Chen, Y.-T. Li, C.-L. Pan, and C.-K. Sun, Appl. Phys. Lett. 92, 064105 (2008).
[Crossref]

A. Hassani, A. Dupuis, and M. Skorobogatiy, Opt. Express 16, 6340 (2008).
[Crossref] [PubMed]

2007 (1)

2006 (2)

2005 (1)

M. Naftaly and R. E. Miles, J. Non-Cryst. Solids 351, 3341 (2005).
[Crossref]

2001 (1)

1990 (1)

1986 (1)

M. A. Duguay, Y. Kokubun, T. L. Koch, and L. Pfeiffer, Appl. Phys. Lett. 49, 13 (1986).
[Crossref]

Bowden, B.

Chang, H.-C.

Chen, H.-W.

Chen, L.-J.

Duguay, M. A.

M. A. Duguay, Y. Kokubun, T. L. Koch, and L. Pfeiffer, Appl. Phys. Lett. 49, 13 (1986).
[Crossref]

Dupuis, A.

Fattinger, C.

Grischkowsky, D.

Harrington, J. A.

Hassani, A.

Hsueh, Y.-C.

Huang, Y.-J.

Huang, Y.-R.

Hwang, Y.-J.

Kao, T.-F.

Keiding, S.

Koch, T. L.

M. A. Duguay, Y. Kokubun, T. L. Koch, and L. Pfeiffer, Appl. Phys. Lett. 49, 13 (1986).
[Crossref]

Kokubun, Y.

M. A. Duguay, Y. Kokubun, T. L. Koch, and L. Pfeiffer, Appl. Phys. Lett. 49, 13 (1986).
[Crossref]

Lai, C.-H.

Lai, C-H.

Li, Y.-T.

J.-Y. Lu, C.-P. Yu, H.-C. Chang, H.-W. Chen, Y.-T. Li, C.-L. Pan, and C.-K. Sun, Appl. Phys. Lett. 92, 064105 (2008).
[Crossref]

Liu, T.-A.

Lu, J.-T.

Lu, J.-Y.

Mendis, R.

Miles, R. E.

M. Naftaly and R. E. Miles, J. Non-Cryst. Solids 351, 3341 (2005).
[Crossref]

Mitrofanov, O.

Mittleman, D. M.

Naftaly, M.

M. Naftaly and R. E. Miles, J. Non-Cryst. Solids 351, 3341 (2005).
[Crossref]

Pan, C.-L.

J.-Y. Lu, C.-P. Yu, H.-C. Chang, H.-W. Chen, Y.-T. Li, C.-L. Pan, and C.-K. Sun, Appl. Phys. Lett. 92, 064105 (2008).
[Crossref]

Peng, J.-L.

Pfeiffer, L.

M. A. Duguay, Y. Kokubun, T. L. Koch, and L. Pfeiffer, Appl. Phys. Lett. 49, 13 (1986).
[Crossref]

Russell, P. St. J.

Skorobogatiy, M.

Sun, C.-K.

van Exter, M.

You, B.

Yu, C.-P.

J.-Y. Lu, C.-P. Yu, H.-C. Chang, H.-W. Chen, Y.-T. Li, C.-L. Pan, and C.-K. Sun, Appl. Phys. Lett. 92, 064105 (2008).
[Crossref]

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Figures (3)

Fig. 1
Fig. 1

(a) Scan of the reference pulse propagated in free space between THz antennas spaced by 43 cm and through a 5 mm diameter hole of a thick metallic plate ( 8 mm ) placed in front of the THz receptor. The system is shown in the inset. (b) Scan of the pulse propagated into the air channel of a thin-wall pipe (plastic straw) with the system shown in the inset.

Fig. 2
Fig. 2

Fourier amplitude spectra of measured pulses after propagation through 40 cm long length of (a) pipe 1, (b) pipe 2 (thick curve), and in free space (thin curve). Calculated resonant frequencies of each waveguide are shown by the vertical lines. (c) Measured attenuation coefficient (thick curve), effective index (dashed curve), and group velocity [divided by light celerity (thin curve)] of waves guided through pipe 2.

Fig. 3
Fig. 3

Fourier amplitude spectra of measured THz pulses after propagation through a 25 cm long length of the straw waveguide (thick curve) or in free space (thin curve). The vertical dashed lines indicate the calculated resonant frequencies. The measured effective index of THz waves guided through the straw is shown by the dashed curve.

Equations (2)

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f m = m c 2 t n 2 1 ,
Δ f = c 2 t n 2 1 .

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