Abstract

This paper reports an experimental and simulation study of a tapered parallel-plate waveguide (TPPWG) to improve THz coupling to the plate separation gap. The flat- and round-type TPPWG without any silicon lens is compared to the parallel-plate waveguide (PPWG) with a plano-cylindrical silicon lens. The spectrum amplitudes of the input-side TPPWG and the input- and output-side TPPWG both having a 3° slop angle increased about 56% and 103% at 1 THz when compared to that of the PPWG. Since the input- and output-side TPPWG had almost no impedance mismatch to the propagating THz wave, coupling to the waveguide could be improved twice compared with the PPWG.

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  1. R. W. McGowan, G. Gallot, and D. Grischkowsky, “Propagation of ultrawideband short pulses of terahertz radiation through submillimeter-diameter circular waveguides,” Opt. Lett. 24(20), 1431–1433 (1999).
    [CrossRef]
  2. G. Gallot, S. P. Jamison, R. W. McGowan, and D. Grischkowsky, “Terahertz waveguides,” J. Opt. Soc. Am. B 17(5), 851–863 (2000).
    [CrossRef]
  3. S. P. Jamison, R. W. McGowan, and D. Grischkowsky, “Single-mode waveguide propagation and reshaping of sub-ps terahertz pulses in sapphire fibers,” Appl. Phys. Lett. 76(15), 1987–1989 (2000).
    [CrossRef]
  4. D. Grischkowsky, “Optoelectronic characterization of transmission lines and waveguides by terahertz time-domain spectroscopy,” IEEE J. Sel. Top. Quantum Electron. 6(6), 1122–1135 (2000).
    [CrossRef]
  5. T. Akalin, A. Teizebré, and B. Bocquet, “Single-wire transmission lines at terahertz frequencies,” IEEE Trans. Microw. Theory Tech. 54(6), 2762–2767 (2006).
    [CrossRef]
  6. T.-I. Jeon, J. Zhang, and D. Grischkowsky, “THz sommerfeld wave propagation on a single metal wire,” Appl. Phys. Lett. 86(16), 161904 (2005).
    [CrossRef]
  7. K. Wang and D. M. Mittleman, “Metal wires for terahertz wave guiding,” Nature 432(7015), 376–379 (2004).
    [CrossRef] [PubMed]
  8. T.-I. Jeon and D. Grischkowsky, “Direct optoelectronic generation and detection of subps electrical pulses on sub-mm coaxial transmission lines,” Appl. Phys. Lett. 85(25), 6092–6094 (2004).
    [CrossRef]
  9. R. Mendis and D. Grischkowsky, “Undistorted guided-wave propagation of subpicosecond terahertz pulses,” Opt. Lett. 26(11), 846–848 (2001).
    [CrossRef]
  10. R. Mendis and D. Grischkowsky, “THz interconnect with low loss and low group velocity dispersion,” IEEE Microwave and Wireless Components Lett. 11(11), 444–446 (2001).
    [CrossRef]
  11. N. Laman, S. S. Harsha, D. Grischkowsky, and J. S. Melinger, “High-resolution waveguide THz spectroscopy of biological molecules,” Biophys. J. 94(3), 1010–1020 (2008).
    [CrossRef]
  12. S. S. Harsha, N. Laman, and D. Grischkowsky, “High Q terahertz bragg resonances within a metal parallel plate waveguide,” Appl. Phys. Lett. 94(9), 091118 (2009).
    [CrossRef]
  13. T. Prasad, V. L. Colvin, Z. Jian, and D. M. Mittleman, “Superprism effect in a metal-clad terahertz photonic crystal slab,” Opt. Lett. 32(6), 683–685 (2007).
    [CrossRef] [PubMed]
  14. E. S. Lee, D. H. Kang, A. I. Fernandez-Dominguez, F. J. Garcia-Vidal, L. Martin-Moreno, D. S. Kim, and T.-I. Jeon, “Bragg reflection of terahertz waves in plasmonic crystals,” Opt. Express 17(11), 9212–9218 (2009).
    [CrossRef] [PubMed]
  15. R. Mendis and D. M. Mittleman, “An investigation of the lowest-order transverse-electric (TE1) mode of the parallel-plate waveguide for THz pulse propagation,” J. Opt. Soc. Am. B 26(9), A6–A13 (2009).
    [CrossRef]
  16. K. Matsumaru, “Reflection coefficient of E-plane tapered waveguides,” IRE Trans. Microwave Theor. Tech. 6(2), 143–149 (1958).
    [CrossRef]
  17. H. G. Unger, “Circular waveguide taper of improved design,” Bell Syst. Tech. J. 37, 899–912 (1958).
  18. S. Panknin, A. K. Hartmann, and T. Salditt, “X-ray propagation in tapered waveguides: Simulation and optimization,” Opt. Commun. 281(10), 2779–2783 (2008).
    [CrossRef]
  19. A. Rusina, M. Durach, K. A. Nelson, and M. I. Stockman, “Nanoconcentration of terahertz radiation in plasmonic waveguides,” Opt. Express 16(23), 18576–18589 (2008).
    [CrossRef]
  20. W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
    [CrossRef]
  21. J. Lloyd-Hughes, G. Scalari, A. van Kolck, M. Fischer, M. Beck, and J. Faist, “Coupling terahertz radiation between sub-wavelength metal-metal waveguides and free space using monolithically integrated horn antennae,” Opt. Express 17(20), 18387–18393 (2009).
    [CrossRef] [PubMed]
  22. J. Zhang and D. Grischkowsky, “Adiabatic compression of parallel-plate metal waveguides for sensitivity enhancement of waveguide THz time-domain spectroscopy,” Appl. Phys. Lett. 86(6), 061109 (2005).
    [CrossRef]
  23. N. Marcuvitz, Waveguide Handbook (Peregrinus, London, 1993).

2009 (4)

2008 (4)

S. Panknin, A. K. Hartmann, and T. Salditt, “X-ray propagation in tapered waveguides: Simulation and optimization,” Opt. Commun. 281(10), 2779–2783 (2008).
[CrossRef]

A. Rusina, M. Durach, K. A. Nelson, and M. I. Stockman, “Nanoconcentration of terahertz radiation in plasmonic waveguides,” Opt. Express 16(23), 18576–18589 (2008).
[CrossRef]

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

N. Laman, S. S. Harsha, D. Grischkowsky, and J. S. Melinger, “High-resolution waveguide THz spectroscopy of biological molecules,” Biophys. J. 94(3), 1010–1020 (2008).
[CrossRef]

2007 (1)

2006 (1)

T. Akalin, A. Teizebré, and B. Bocquet, “Single-wire transmission lines at terahertz frequencies,” IEEE Trans. Microw. Theory Tech. 54(6), 2762–2767 (2006).
[CrossRef]

2005 (2)

T.-I. Jeon, J. Zhang, and D. Grischkowsky, “THz sommerfeld wave propagation on a single metal wire,” Appl. Phys. Lett. 86(16), 161904 (2005).
[CrossRef]

J. Zhang and D. Grischkowsky, “Adiabatic compression of parallel-plate metal waveguides for sensitivity enhancement of waveguide THz time-domain spectroscopy,” Appl. Phys. Lett. 86(6), 061109 (2005).
[CrossRef]

2004 (2)

K. Wang and D. M. Mittleman, “Metal wires for terahertz wave guiding,” Nature 432(7015), 376–379 (2004).
[CrossRef] [PubMed]

T.-I. Jeon and D. Grischkowsky, “Direct optoelectronic generation and detection of subps electrical pulses on sub-mm coaxial transmission lines,” Appl. Phys. Lett. 85(25), 6092–6094 (2004).
[CrossRef]

2001 (2)

R. Mendis and D. Grischkowsky, “Undistorted guided-wave propagation of subpicosecond terahertz pulses,” Opt. Lett. 26(11), 846–848 (2001).
[CrossRef]

R. Mendis and D. Grischkowsky, “THz interconnect with low loss and low group velocity dispersion,” IEEE Microwave and Wireless Components Lett. 11(11), 444–446 (2001).
[CrossRef]

2000 (3)

G. Gallot, S. P. Jamison, R. W. McGowan, and D. Grischkowsky, “Terahertz waveguides,” J. Opt. Soc. Am. B 17(5), 851–863 (2000).
[CrossRef]

S. P. Jamison, R. W. McGowan, and D. Grischkowsky, “Single-mode waveguide propagation and reshaping of sub-ps terahertz pulses in sapphire fibers,” Appl. Phys. Lett. 76(15), 1987–1989 (2000).
[CrossRef]

D. Grischkowsky, “Optoelectronic characterization of transmission lines and waveguides by terahertz time-domain spectroscopy,” IEEE J. Sel. Top. Quantum Electron. 6(6), 1122–1135 (2000).
[CrossRef]

1999 (1)

1958 (2)

K. Matsumaru, “Reflection coefficient of E-plane tapered waveguides,” IRE Trans. Microwave Theor. Tech. 6(2), 143–149 (1958).
[CrossRef]

H. G. Unger, “Circular waveguide taper of improved design,” Bell Syst. Tech. J. 37, 899–912 (1958).

Harsha, S. S.

S. S. Harsha, N. Laman, and D. Grischkowsky, “High Q terahertz bragg resonances within a metal parallel plate waveguide,” Appl. Phys. Lett. 94(9), 091118 (2009).
[CrossRef]

Akalin, T.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

T. Akalin, A. Teizebré, and B. Bocquet, “Single-wire transmission lines at terahertz frequencies,” IEEE Trans. Microw. Theory Tech. 54(6), 2762–2767 (2006).
[CrossRef]

Andronico, A.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Barbieri, S.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Beck, M.

Beere, H. E.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Bocquet, B.

T. Akalin, A. Teizebré, and B. Bocquet, “Single-wire transmission lines at terahertz frequencies,” IEEE Trans. Microw. Theory Tech. 54(6), 2762–2767 (2006).
[CrossRef]

Colvin, V. L.

Durach, M.

Faist, J.

Fernandez-Dominguez, A. I.

Filloux, P.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Fischer, M.

Gallot, G.

Garcia-Vidal, F. J.

Gellie, P.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Grischkowsky, D.

S. S. Harsha, N. Laman, and D. Grischkowsky, “High Q terahertz bragg resonances within a metal parallel plate waveguide,” Appl. Phys. Lett. 94(9), 091118 (2009).
[CrossRef]

N. Laman, S. S. Harsha, D. Grischkowsky, and J. S. Melinger, “High-resolution waveguide THz spectroscopy of biological molecules,” Biophys. J. 94(3), 1010–1020 (2008).
[CrossRef]

T.-I. Jeon, J. Zhang, and D. Grischkowsky, “THz sommerfeld wave propagation on a single metal wire,” Appl. Phys. Lett. 86(16), 161904 (2005).
[CrossRef]

J. Zhang and D. Grischkowsky, “Adiabatic compression of parallel-plate metal waveguides for sensitivity enhancement of waveguide THz time-domain spectroscopy,” Appl. Phys. Lett. 86(6), 061109 (2005).
[CrossRef]

T.-I. Jeon and D. Grischkowsky, “Direct optoelectronic generation and detection of subps electrical pulses on sub-mm coaxial transmission lines,” Appl. Phys. Lett. 85(25), 6092–6094 (2004).
[CrossRef]

R. Mendis and D. Grischkowsky, “THz interconnect with low loss and low group velocity dispersion,” IEEE Microwave and Wireless Components Lett. 11(11), 444–446 (2001).
[CrossRef]

R. Mendis and D. Grischkowsky, “Undistorted guided-wave propagation of subpicosecond terahertz pulses,” Opt. Lett. 26(11), 846–848 (2001).
[CrossRef]

G. Gallot, S. P. Jamison, R. W. McGowan, and D. Grischkowsky, “Terahertz waveguides,” J. Opt. Soc. Am. B 17(5), 851–863 (2000).
[CrossRef]

S. P. Jamison, R. W. McGowan, and D. Grischkowsky, “Single-mode waveguide propagation and reshaping of sub-ps terahertz pulses in sapphire fibers,” Appl. Phys. Lett. 76(15), 1987–1989 (2000).
[CrossRef]

D. Grischkowsky, “Optoelectronic characterization of transmission lines and waveguides by terahertz time-domain spectroscopy,” IEEE J. Sel. Top. Quantum Electron. 6(6), 1122–1135 (2000).
[CrossRef]

R. W. McGowan, G. Gallot, and D. Grischkowsky, “Propagation of ultrawideband short pulses of terahertz radiation through submillimeter-diameter circular waveguides,” Opt. Lett. 24(20), 1431–1433 (1999).
[CrossRef]

Harsha, S. S.

N. Laman, S. S. Harsha, D. Grischkowsky, and J. S. Melinger, “High-resolution waveguide THz spectroscopy of biological molecules,” Biophys. J. 94(3), 1010–1020 (2008).
[CrossRef]

Hartmann, A. K.

S. Panknin, A. K. Hartmann, and T. Salditt, “X-ray propagation in tapered waveguides: Simulation and optimization,” Opt. Commun. 281(10), 2779–2783 (2008).
[CrossRef]

Jamison, S. P.

S. P. Jamison, R. W. McGowan, and D. Grischkowsky, “Single-mode waveguide propagation and reshaping of sub-ps terahertz pulses in sapphire fibers,” Appl. Phys. Lett. 76(15), 1987–1989 (2000).
[CrossRef]

G. Gallot, S. P. Jamison, R. W. McGowan, and D. Grischkowsky, “Terahertz waveguides,” J. Opt. Soc. Am. B 17(5), 851–863 (2000).
[CrossRef]

Jeon, T.-I.

E. S. Lee, D. H. Kang, A. I. Fernandez-Dominguez, F. J. Garcia-Vidal, L. Martin-Moreno, D. S. Kim, and T.-I. Jeon, “Bragg reflection of terahertz waves in plasmonic crystals,” Opt. Express 17(11), 9212–9218 (2009).
[CrossRef] [PubMed]

T.-I. Jeon, J. Zhang, and D. Grischkowsky, “THz sommerfeld wave propagation on a single metal wire,” Appl. Phys. Lett. 86(16), 161904 (2005).
[CrossRef]

T.-I. Jeon and D. Grischkowsky, “Direct optoelectronic generation and detection of subps electrical pulses on sub-mm coaxial transmission lines,” Appl. Phys. Lett. 85(25), 6092–6094 (2004).
[CrossRef]

Jian, Z.

Kang, D. H.

Kim, D. S.

Laman, N.

S. S. Harsha, N. Laman, and D. Grischkowsky, “High Q terahertz bragg resonances within a metal parallel plate waveguide,” Appl. Phys. Lett. 94(9), 091118 (2009).
[CrossRef]

N. Laman, S. S. Harsha, D. Grischkowsky, and J. S. Melinger, “High-resolution waveguide THz spectroscopy of biological molecules,” Biophys. J. 94(3), 1010–1020 (2008).
[CrossRef]

Lampin, J. F.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Lee, E. S.

Leo, G.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Lloyd-Hughes, J.

Maineult, W.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Martin-Moreno, L.

Matsumaru, K.

K. Matsumaru, “Reflection coefficient of E-plane tapered waveguides,” IRE Trans. Microwave Theor. Tech. 6(2), 143–149 (1958).
[CrossRef]

McGowan, R. W.

Melinger, J. S.

N. Laman, S. S. Harsha, D. Grischkowsky, and J. S. Melinger, “High-resolution waveguide THz spectroscopy of biological molecules,” Biophys. J. 94(3), 1010–1020 (2008).
[CrossRef]

Mendis, R.

Mittleman, D. M.

Nelson, K. A.

Panknin, S.

S. Panknin, A. K. Hartmann, and T. Salditt, “X-ray propagation in tapered waveguides: Simulation and optimization,” Opt. Commun. 281(10), 2779–2783 (2008).
[CrossRef]

Peytavit, E.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Prasad, T.

Ritchie, D. A.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Rusina, A.

Salditt, T.

S. Panknin, A. K. Hartmann, and T. Salditt, “X-ray propagation in tapered waveguides: Simulation and optimization,” Opt. Commun. 281(10), 2779–2783 (2008).
[CrossRef]

Scalari, G.

Sirtori, C.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

Stockman, M. I.

Teizebré, A.

T. Akalin, A. Teizebré, and B. Bocquet, “Single-wire transmission lines at terahertz frequencies,” IEEE Trans. Microw. Theory Tech. 54(6), 2762–2767 (2006).
[CrossRef]

Unger, H. G.

H. G. Unger, “Circular waveguide taper of improved design,” Bell Syst. Tech. J. 37, 899–912 (1958).

van Kolck, A.

Wang, K.

K. Wang and D. M. Mittleman, “Metal wires for terahertz wave guiding,” Nature 432(7015), 376–379 (2004).
[CrossRef] [PubMed]

Zhang, J.

T.-I. Jeon, J. Zhang, and D. Grischkowsky, “THz sommerfeld wave propagation on a single metal wire,” Appl. Phys. Lett. 86(16), 161904 (2005).
[CrossRef]

J. Zhang and D. Grischkowsky, “Adiabatic compression of parallel-plate metal waveguides for sensitivity enhancement of waveguide THz time-domain spectroscopy,” Appl. Phys. Lett. 86(6), 061109 (2005).
[CrossRef]

Appl. Phys. Lett. (6)

S. P. Jamison, R. W. McGowan, and D. Grischkowsky, “Single-mode waveguide propagation and reshaping of sub-ps terahertz pulses in sapphire fibers,” Appl. Phys. Lett. 76(15), 1987–1989 (2000).
[CrossRef]

T.-I. Jeon, J. Zhang, and D. Grischkowsky, “THz sommerfeld wave propagation on a single metal wire,” Appl. Phys. Lett. 86(16), 161904 (2005).
[CrossRef]

T.-I. Jeon and D. Grischkowsky, “Direct optoelectronic generation and detection of subps electrical pulses on sub-mm coaxial transmission lines,” Appl. Phys. Lett. 85(25), 6092–6094 (2004).
[CrossRef]

S. S. Harsha, N. Laman, and D. Grischkowsky, “High Q terahertz bragg resonances within a metal parallel plate waveguide,” Appl. Phys. Lett. 94(9), 091118 (2009).
[CrossRef]

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. F. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse electromagnetic- horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[CrossRef]

J. Zhang and D. Grischkowsky, “Adiabatic compression of parallel-plate metal waveguides for sensitivity enhancement of waveguide THz time-domain spectroscopy,” Appl. Phys. Lett. 86(6), 061109 (2005).
[CrossRef]

Bell Syst. Tech. J. (1)

H. G. Unger, “Circular waveguide taper of improved design,” Bell Syst. Tech. J. 37, 899–912 (1958).

Biophys. J. (1)

N. Laman, S. S. Harsha, D. Grischkowsky, and J. S. Melinger, “High-resolution waveguide THz spectroscopy of biological molecules,” Biophys. J. 94(3), 1010–1020 (2008).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

D. Grischkowsky, “Optoelectronic characterization of transmission lines and waveguides by terahertz time-domain spectroscopy,” IEEE J. Sel. Top. Quantum Electron. 6(6), 1122–1135 (2000).
[CrossRef]

IEEE Microwave and Wireless Components Lett. (1)

R. Mendis and D. Grischkowsky, “THz interconnect with low loss and low group velocity dispersion,” IEEE Microwave and Wireless Components Lett. 11(11), 444–446 (2001).
[CrossRef]

IEEE Trans. Microw. Theory Tech. (1)

T. Akalin, A. Teizebré, and B. Bocquet, “Single-wire transmission lines at terahertz frequencies,” IEEE Trans. Microw. Theory Tech. 54(6), 2762–2767 (2006).
[CrossRef]

IRE Trans. Microwave Theor. Tech. (1)

K. Matsumaru, “Reflection coefficient of E-plane tapered waveguides,” IRE Trans. Microwave Theor. Tech. 6(2), 143–149 (1958).
[CrossRef]

J. Opt. Soc. Am. B (2)

Nature (1)

K. Wang and D. M. Mittleman, “Metal wires for terahertz wave guiding,” Nature 432(7015), 376–379 (2004).
[CrossRef] [PubMed]

Opt. Commun. (1)

S. Panknin, A. K. Hartmann, and T. Salditt, “X-ray propagation in tapered waveguides: Simulation and optimization,” Opt. Commun. 281(10), 2779–2783 (2008).
[CrossRef]

Opt. Express (3)

Opt. Lett. (3)

Other (1)

N. Marcuvitz, Waveguide Handbook (Peregrinus, London, 1993).

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Figures (5)

Fig. 1
Fig. 1

(a) Measured THz pulses of the TPPWG with different slop angles, and dotted THz pulses for the PPWG. (b) Corresponding amplitude spectra for the THz pulses. The inset shows the amplitude ratios of the PPWG and the 3° TPPWG.

Fig. 2
Fig. 2

Calculated input-side magnitude of THz field distribution. (a) 10° non-round TPPWG. (b) 10° round TPPWG with an 80mm-diameter circular arc.

Fig. 3
Fig. 3

(a) Measured THz pulses for the 10° round TPPWG (upper pulse) and the 10° non-round TPPWG (lower pulse). The inset shows the comparison of the pulses. (b) Corresponding amplitude spectra for the THz pulses. The inset shows the amplitude ratio.

Fig. 4
Fig. 4

Calculated the magnitude of THz field propagations to the air by the output tapered structure at a 10° angle. The magnitude of THz field shows by a snapshot every 1.25 mm period.

Fig. 5
Fig. 5

Comparison of the PPWG and the one-sided and two-sided TPPWGs with 3° slop angles. (a) Measured THz pulses. The measured reference pulse is shown in the upper pulse. (b) Corresponding amplitude spectra for the THz pulses. (c) The amplitude ratios of reference × α and the measured spectra. The inset shows the amplitude ratios of the PPWG and the two-sided TPPWG.

Equations (1)

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α = 1 d ζ for TEM ,

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