Abstract

We analyze surface-emitting distributed feedback resonators for Terahertz quantum cascade lasers fabricated from double-metal waveguides. We explain the influence on resonances and surface-emission properties of the finite length and width of the gratings in connection with absorbing boundary conditions, and show that, contrary to the infinite case, the modes on either side of the photonic band-gap have finite surface losses. The lateral design of the resonator is shown to be important to avoid transverse modes of higher order and anti-guiding effects. Experimental findings are indeed in excellent agreement with the simulations. Both modeling and fabrication can easily be applied to arbitrary gratings, of which we discuss here a first interesting example.

©2009 Optical Society of America

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  1. R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
    [Crossref] [PubMed]
  2. B. S. Williams, “Terahertz quantum-cascade lasers,” Nature Photonics 1, 517–525 (2007).
    [Crossref]
  3. H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
    [Crossref]
  4. A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, and Q. Hu “Real-time terahertz imaging over a standoff distance (>25 meters),” Appl. Phys. Lett.  89, 141125 (2006).
    [Crossref]
  5. S. Kumar and A. W. M. Lee “Resonant-phonon terahertz quantum-cascade lasers and video-rate terahertz imaging,” IEEE J. Sel. Top. Quantum Electron.  14, 333–344 (2008).
    [Crossref]
  6. H.-W. Hübers, S. Pavlov, A. Semenov, R. Köhler, L. Mahler, A. Tredicucci, H. Beere, D. Ritchie, and E. Linfield, “Terahertz quantum cascade laser as local oscillator in a heterodyne receiver,” Opt. Express 13, 5890–5896 (2005).
    [Crossref] [PubMed]
  7. B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno “Terahertz quantum-cascade laser at λ ≈ 100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett.  83, 2124–2126 (2003).
    [Crossref]
  8. B. S. Williams, S. Kumar, Q. Hu, and J. Reno, “Operation of terahertz quantum-cascade lasers at 164 K in pulsed mode and at 117 K in continuous-wave mode,” Opt. Express 13, 3331–3339 (2005).
    [Crossref] [PubMed]
  9. M. A. Belkin, J. A. Fan, S. Hormoz, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with copper metal-metal waveguides operating up to 178 K,” Opt. Express 16, 3242–3248 (2008).
    [Crossref] [PubMed]
  10. M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett.  43, 573–574, (2007).
    [Crossref]
  11. 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.  93183508 (2008).
    [Crossref]
  12. A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett.  32, 2840–2842, (2007).
    [Crossref]
  13. O. Demichel, L. Mahler, T. Losco, C. Mauro, R. Green, A. Tredicucci, J. Xu, F. Beltram, H. E. Beere, D. A. Ritchie, and V. Tamošinuas, “Surface plasmon photonic structures in terahertz quantum cascade lasers,” Opt. Express 14, 5335–5345 (2006).
    [Crossref] [PubMed]
  14. J. A. Fan, M. A. Belkin, F. Capasso, S. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Surface emitting terahertz quantum cascade laser with a double-metal waveguide,” Opt. Express 14, 11672–11680 (2006).
    [Crossref] [PubMed]
  15. S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15, 113–128 (2007).
    [Crossref] [PubMed]
  16. C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
    [Crossref]
  17. M. Schubert and F. Rana, “Analysis of Terahertz Surface Emitting Quantum-Cascade Lasers,” IEEE J. Quantum Electron.  42, 257 (2006).
    [Crossref]
  18. M. A. Ordal, R. J. Bell, R. W. Alexander, L. L. Long, and M. R. Querry, “Optical properties of Au, Ni, and Pb at submillimeter wavelengths,” Appl. Opt.  26, 744 (1987).
    [Crossref] [PubMed]
  19. L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (2009).
    [Crossref]
  20. L. Mahler, A. Tredicucci, R. Köhler, F. Beltram, H. E. Beere, E. H. Linfield, and D. A. Ritchie “High-Performance operation of single-mode terahertz quantum cascade lasers with metallic gratings,” Appl. Phys. Lett.,  87, 181101 (2004).
    [Crossref]
  21. J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. Giles Davies, and Edmund H. Linfield “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett.  92031106 (2008).
    [Crossref]

2009 (1)

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (2009).
[Crossref]

2008 (4)

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. Giles Davies, and Edmund H. Linfield “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett.  92031106 (2008).
[Crossref]

S. Kumar and A. W. M. Lee “Resonant-phonon terahertz quantum-cascade lasers and video-rate terahertz imaging,” IEEE J. Sel. Top. Quantum Electron.  14, 333–344 (2008).
[Crossref]

M. A. Belkin, J. A. Fan, S. Hormoz, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with copper metal-metal waveguides operating up to 178 K,” Opt. Express 16, 3242–3248 (2008).
[Crossref] [PubMed]

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.  93183508 (2008).
[Crossref]

2007 (4)

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett.  32, 2840–2842, (2007).
[Crossref]

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15, 113–128 (2007).
[Crossref] [PubMed]

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett.  43, 573–574, (2007).
[Crossref]

B. S. Williams, “Terahertz quantum-cascade lasers,” Nature Photonics 1, 517–525 (2007).
[Crossref]

2006 (5)

H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
[Crossref]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, and Q. Hu “Real-time terahertz imaging over a standoff distance (>25 meters),” Appl. Phys. Lett.  89, 141125 (2006).
[Crossref]

M. Schubert and F. Rana, “Analysis of Terahertz Surface Emitting Quantum-Cascade Lasers,” IEEE J. Quantum Electron.  42, 257 (2006).
[Crossref]

O. Demichel, L. Mahler, T. Losco, C. Mauro, R. Green, A. Tredicucci, J. Xu, F. Beltram, H. E. Beere, D. A. Ritchie, and V. Tamošinuas, “Surface plasmon photonic structures in terahertz quantum cascade lasers,” Opt. Express 14, 5335–5345 (2006).
[Crossref] [PubMed]

J. A. Fan, M. A. Belkin, F. Capasso, S. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Surface emitting terahertz quantum cascade laser with a double-metal waveguide,” Opt. Express 14, 11672–11680 (2006).
[Crossref] [PubMed]

2005 (3)

2004 (1)

L. Mahler, A. Tredicucci, R. Köhler, F. Beltram, H. E. Beere, E. H. Linfield, and D. A. Ritchie “High-Performance operation of single-mode terahertz quantum cascade lasers with metallic gratings,” Appl. Phys. Lett.,  87, 181101 (2004).
[Crossref]

2003 (1)

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno “Terahertz quantum-cascade laser at λ ≈ 100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett.  83, 2124–2126 (2003).
[Crossref]

2002 (1)

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
[Crossref] [PubMed]

1987 (1)

M. A. Ordal, R. J. Bell, R. W. Alexander, L. L. Long, and M. R. Querry, “Optical properties of Au, Ni, and Pb at submillimeter wavelengths,” Appl. Opt.  26, 744 (1987).
[Crossref] [PubMed]

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.  93183508 (2008).
[Crossref]

Alexander, R. W.

M. A. Ordal, R. J. Bell, R. W. Alexander, L. L. Long, and M. R. Querry, “Optical properties of Au, Ni, and Pb at submillimeter wavelengths,” Appl. Opt.  26, 744 (1987).
[Crossref] [PubMed]

Amanti, M. I.

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett.  43, 573–574, (2007).
[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.  93183508 (2008).
[Crossref]

Austerer, M.

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[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.  93183508 (2008).
[Crossref]

Beere, H.

Beere, H. E.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (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.  93183508 (2008).
[Crossref]

H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
[Crossref]

O. Demichel, L. Mahler, T. Losco, C. Mauro, R. Green, A. Tredicucci, J. Xu, F. Beltram, H. E. Beere, D. A. Ritchie, and V. Tamošinuas, “Surface plasmon photonic structures in terahertz quantum cascade lasers,” Opt. Express 14, 5335–5345 (2006).
[Crossref] [PubMed]

L. Mahler, A. Tredicucci, R. Köhler, F. Beltram, H. E. Beere, E. H. Linfield, and D. A. Ritchie “High-Performance operation of single-mode terahertz quantum cascade lasers with metallic gratings,” Appl. Phys. Lett.,  87, 181101 (2004).
[Crossref]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
[Crossref] [PubMed]

Belkin, M. A.

Bell, R. J.

M. A. Ordal, R. J. Bell, R. W. Alexander, L. L. Long, and M. R. Querry, “Optical properties of Au, Ni, and Pb at submillimeter wavelengths,” Appl. Opt.  26, 744 (1987).
[Crossref] [PubMed]

Beltram, F.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (2009).
[Crossref]

O. Demichel, L. Mahler, T. Losco, C. Mauro, R. Green, A. Tredicucci, J. Xu, F. Beltram, H. E. Beere, D. A. Ritchie, and V. Tamošinuas, “Surface plasmon photonic structures in terahertz quantum cascade lasers,” Opt. Express 14, 5335–5345 (2006).
[Crossref] [PubMed]

L. Mahler, A. Tredicucci, R. Köhler, F. Beltram, H. E. Beere, E. H. Linfield, and D. A. Ritchie “High-Performance operation of single-mode terahertz quantum cascade lasers with metallic gratings,” Appl. Phys. Lett.,  87, 181101 (2004).
[Crossref]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
[Crossref] [PubMed]

Callebaut, H.

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno “Terahertz quantum-cascade laser at λ ≈ 100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett.  83, 2124–2126 (2003).
[Crossref]

Capasso, F.

Cockburn, J. W.

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[Crossref]

Davies, A. G.

Demichel, O.

Faist, J.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (2009).
[Crossref]

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett.  43, 573–574, (2007).
[Crossref]

Fan, J. A.

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.  93183508 (2008).
[Crossref]

Fischer, M.

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett.  43, 573–574, (2007).
[Crossref]

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.  93183508 (2008).
[Crossref]

Giles Davies, A.

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. Giles Davies, and Edmund H. Linfield “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett.  92031106 (2008).
[Crossref]

Golka, S.

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[Crossref]

Green, R.

Green, R. P.

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[Crossref]

Hormoz, S.

Hu, Q.

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15, 113–128 (2007).
[Crossref] [PubMed]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett.  32, 2840–2842, (2007).
[Crossref]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, and Q. Hu “Real-time terahertz imaging over a standoff distance (>25 meters),” Appl. Phys. Lett.  89, 141125 (2006).
[Crossref]

B. S. Williams, S. Kumar, Q. Hu, and J. Reno, “Operation of terahertz quantum-cascade lasers at 164 K in pulsed mode and at 117 K in continuous-wave mode,” Opt. Express 13, 3331–3339 (2005).
[Crossref] [PubMed]

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno “Terahertz quantum-cascade laser at λ ≈ 100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett.  83, 2124–2126 (2003).
[Crossref]

Hübers, H.-W.

H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
[Crossref]

H.-W. Hübers, S. Pavlov, A. Semenov, R. Köhler, L. Mahler, A. Tredicucci, H. Beere, D. Ritchie, and E. Linfield, “Terahertz quantum cascade laser as local oscillator in a heterodyne receiver,” Opt. Express 13, 5890–5896 (2005).
[Crossref] [PubMed]

Iotti, R. C.

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
[Crossref] [PubMed]

Khanna, S.

Khanna, S. P.

M. A. Belkin, J. A. Fan, S. Hormoz, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with copper metal-metal waveguides operating up to 178 K,” Opt. Express 16, 3242–3248 (2008).
[Crossref] [PubMed]

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. Giles Davies, and Edmund H. Linfield “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett.  92031106 (2008).
[Crossref]

Köhler, R.

H.-W. Hübers, S. Pavlov, A. Semenov, R. Köhler, L. Mahler, A. Tredicucci, H. Beere, D. Ritchie, and E. Linfield, “Terahertz quantum cascade laser as local oscillator in a heterodyne receiver,” Opt. Express 13, 5890–5896 (2005).
[Crossref] [PubMed]

L. Mahler, A. Tredicucci, R. Köhler, F. Beltram, H. E. Beere, E. H. Linfield, and D. A. Ritchie “High-Performance operation of single-mode terahertz quantum cascade lasers with metallic gratings,” Appl. Phys. Lett.,  87, 181101 (2004).
[Crossref]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
[Crossref] [PubMed]

Krysa, A. B.

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[Crossref]

Kumar, S.

S. Kumar and A. W. M. Lee “Resonant-phonon terahertz quantum-cascade lasers and video-rate terahertz imaging,” IEEE J. Sel. Top. Quantum Electron.  14, 333–344 (2008).
[Crossref]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett.  32, 2840–2842, (2007).
[Crossref]

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15, 113–128 (2007).
[Crossref] [PubMed]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, and Q. Hu “Real-time terahertz imaging over a standoff distance (>25 meters),” Appl. Phys. Lett.  89, 141125 (2006).
[Crossref]

B. S. Williams, S. Kumar, Q. Hu, and J. Reno, “Operation of terahertz quantum-cascade lasers at 164 K in pulsed mode and at 117 K in continuous-wave mode,” Opt. Express 13, 3331–3339 (2005).
[Crossref] [PubMed]

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno “Terahertz quantum-cascade laser at λ ≈ 100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett.  83, 2124–2126 (2003).
[Crossref]

Lachab, M.

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.  93183508 (2008).
[Crossref]

Lee, A. W.

Lee, A. W. M.

S. Kumar and A. W. M. Lee “Resonant-phonon terahertz quantum-cascade lasers and video-rate terahertz imaging,” IEEE J. Sel. Top. Quantum Electron.  14, 333–344 (2008).
[Crossref]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett.  32, 2840–2842, (2007).
[Crossref]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, and Q. Hu “Real-time terahertz imaging over a standoff distance (>25 meters),” Appl. Phys. Lett.  89, 141125 (2006).
[Crossref]

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.  93183508 (2008).
[Crossref]

Linfield, E.

Linfield, E. H.

M. A. Belkin, J. A. Fan, S. Hormoz, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with copper metal-metal waveguides operating up to 178 K,” Opt. Express 16, 3242–3248 (2008).
[Crossref] [PubMed]

J. A. Fan, M. A. Belkin, F. Capasso, S. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Surface emitting terahertz quantum cascade laser with a double-metal waveguide,” Opt. Express 14, 11672–11680 (2006).
[Crossref] [PubMed]

L. Mahler, A. Tredicucci, R. Köhler, F. Beltram, H. E. Beere, E. H. Linfield, and D. A. Ritchie “High-Performance operation of single-mode terahertz quantum cascade lasers with metallic gratings,” Appl. Phys. Lett.,  87, 181101 (2004).
[Crossref]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
[Crossref] [PubMed]

Linfield, Edmund H.

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. Giles Davies, and Edmund H. Linfield “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett.  92031106 (2008).
[Crossref]

Long, L. L.

M. A. Ordal, R. J. Bell, R. W. Alexander, L. L. Long, and M. R. Querry, “Optical properties of Au, Ni, and Pb at submillimeter wavelengths,” Appl. Opt.  26, 744 (1987).
[Crossref] [PubMed]

Losco, T.

Mahler, L.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (2009).
[Crossref]

H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
[Crossref]

O. Demichel, L. Mahler, T. Losco, C. Mauro, R. Green, A. Tredicucci, J. Xu, F. Beltram, H. E. Beere, D. A. Ritchie, and V. Tamošinuas, “Surface plasmon photonic structures in terahertz quantum cascade lasers,” Opt. Express 14, 5335–5345 (2006).
[Crossref] [PubMed]

H.-W. Hübers, S. Pavlov, A. Semenov, R. Köhler, L. Mahler, A. Tredicucci, H. Beere, D. Ritchie, and E. Linfield, “Terahertz quantum cascade laser as local oscillator in a heterodyne receiver,” Opt. Express 13, 5890–5896 (2005).
[Crossref] [PubMed]

L. Mahler, A. Tredicucci, R. Köhler, F. Beltram, H. E. Beere, E. H. Linfield, and D. A. Ritchie “High-Performance operation of single-mode terahertz quantum cascade lasers with metallic gratings,” Appl. Phys. Lett.,  87, 181101 (2004).
[Crossref]

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.  93183508 (2008).
[Crossref]

Mauro, C.

Ordal, M. A.

M. A. Ordal, R. J. Bell, R. W. Alexander, L. L. Long, and M. R. Querry, “Optical properties of Au, Ni, and Pb at submillimeter wavelengths,” Appl. Opt.  26, 744 (1987).
[Crossref] [PubMed]

Pavlov, S.

Pavlov, S. G.

H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
[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.  93183508 (2008).
[Crossref]

Pflügl, C.

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[Crossref]

Qin, Q.

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett.  32, 2840–2842, (2007).
[Crossref]

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15, 113–128 (2007).
[Crossref] [PubMed]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, and Q. Hu “Real-time terahertz imaging over a standoff distance (>25 meters),” Appl. Phys. Lett.  89, 141125 (2006).
[Crossref]

Querry, M. R.

M. A. Ordal, R. J. Bell, R. W. Alexander, L. L. Long, and M. R. Querry, “Optical properties of Au, Ni, and Pb at submillimeter wavelengths,” Appl. Opt.  26, 744 (1987).
[Crossref] [PubMed]

Rana, F.

M. Schubert and F. Rana, “Analysis of Terahertz Surface Emitting Quantum-Cascade Lasers,” IEEE J. Quantum Electron.  42, 257 (2006).
[Crossref]

Reno, J.

Reno, J. L.

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15, 113–128 (2007).
[Crossref] [PubMed]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett.  32, 2840–2842, (2007).
[Crossref]

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno “Terahertz quantum-cascade laser at λ ≈ 100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett.  83, 2124–2126 (2003).
[Crossref]

Richter, H.

H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
[Crossref]

Ritchie, D.

Ritchie, D. A.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (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.  93183508 (2008).
[Crossref]

H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
[Crossref]

O. Demichel, L. Mahler, T. Losco, C. Mauro, R. Green, A. Tredicucci, J. Xu, F. Beltram, H. E. Beere, D. A. Ritchie, and V. Tamošinuas, “Surface plasmon photonic structures in terahertz quantum cascade lasers,” Opt. Express 14, 5335–5345 (2006).
[Crossref] [PubMed]

L. Mahler, A. Tredicucci, R. Köhler, F. Beltram, H. E. Beere, E. H. Linfield, and D. A. Ritchie “High-Performance operation of single-mode terahertz quantum cascade lasers with metallic gratings,” Appl. Phys. Lett.,  87, 181101 (2004).
[Crossref]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
[Crossref] [PubMed]

Roberts, J. S.

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[Crossref]

Rossi, F.

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
[Crossref] [PubMed]

Scalari, G.

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett.  43, 573–574, (2007).
[Crossref]

Schrenk, W.

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[Crossref]

Schubert, M.

M. Schubert and F. Rana, “Analysis of Terahertz Surface Emitting Quantum-Cascade Lasers,” IEEE J. Quantum Electron.  42, 257 (2006).
[Crossref]

Semenov, A.

Semenov, A. D.

H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
[Crossref]

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.  93183508 (2008).
[Crossref]

Strasser, G.

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[Crossref]

Tamošinuas, V.

Tredicucci, A.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (2009).
[Crossref]

H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
[Crossref]

O. Demichel, L. Mahler, T. Losco, C. Mauro, R. Green, A. Tredicucci, J. Xu, F. Beltram, H. E. Beere, D. A. Ritchie, and V. Tamošinuas, “Surface plasmon photonic structures in terahertz quantum cascade lasers,” Opt. Express 14, 5335–5345 (2006).
[Crossref] [PubMed]

H.-W. Hübers, S. Pavlov, A. Semenov, R. Köhler, L. Mahler, A. Tredicucci, H. Beere, D. Ritchie, and E. Linfield, “Terahertz quantum cascade laser as local oscillator in a heterodyne receiver,” Opt. Express 13, 5890–5896 (2005).
[Crossref] [PubMed]

L. Mahler, A. Tredicucci, R. Köhler, F. Beltram, H. E. Beere, E. H. Linfield, and D. A. Ritchie “High-Performance operation of single-mode terahertz quantum cascade lasers with metallic gratings,” Appl. Phys. Lett.,  87, 181101 (2004).
[Crossref]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
[Crossref] [PubMed]

Walther, C.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (2009).
[Crossref]

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett.  43, 573–574, (2007).
[Crossref]

Williams, B. S.

B. S. Williams, “Terahertz quantum-cascade lasers,” Nature Photonics 1, 517–525 (2007).
[Crossref]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett.  32, 2840–2842, (2007).
[Crossref]

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15, 113–128 (2007).
[Crossref] [PubMed]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, and Q. Hu “Real-time terahertz imaging over a standoff distance (>25 meters),” Appl. Phys. Lett.  89, 141125 (2006).
[Crossref]

B. S. Williams, S. Kumar, Q. Hu, and J. Reno, “Operation of terahertz quantum-cascade lasers at 164 K in pulsed mode and at 117 K in continuous-wave mode,” Opt. Express 13, 3331–3339 (2005).
[Crossref] [PubMed]

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno “Terahertz quantum-cascade laser at λ ≈ 100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett.  83, 2124–2126 (2003).
[Crossref]

Wilson, L. R.

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[Crossref]

Witzigmann, B.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (2009).
[Crossref]

Xu, J.

Appl. Opt (1)

M. A. Ordal, R. J. Bell, R. W. Alexander, L. L. Long, and M. R. Querry, “Optical properties of Au, Ni, and Pb at submillimeter wavelengths,” Appl. Opt.  26, 744 (1987).
[Crossref] [PubMed]

Appl. Phys. Lett (7)

C. Pflügl, M. Austerer, W. Schrenk, S. Golka, G. Strasser, R. P. Green, L. R. Wilson, J. W. Cockburn, A. B. Krysa, and J. S. Roberts, “Single-mode surface-emitting quantum-cascade lasers,” Appl. Phys. Lett.  86211102 (2005).
[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.  93183508 (2008).
[Crossref]

H.-W. Hübers, S. G. Pavlov, H. Richter, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, and D. A. Ritchie, “High-resolution gas phase spectroscopy with a distributed feedback terahertz quantum cascade laser,” Appl. Phys. Lett.  89, 061115 (2006).
[Crossref]

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, and Q. Hu “Real-time terahertz imaging over a standoff distance (>25 meters),” Appl. Phys. Lett.  89, 141125 (2006).
[Crossref]

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno “Terahertz quantum-cascade laser at λ ≈ 100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett.  83, 2124–2126 (2003).
[Crossref]

L. Mahler, A. Tredicucci, R. Köhler, F. Beltram, H. E. Beere, E. H. Linfield, and D. A. Ritchie “High-Performance operation of single-mode terahertz quantum cascade lasers with metallic gratings,” Appl. Phys. Lett.,  87, 181101 (2004).
[Crossref]

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. Giles Davies, and Edmund H. Linfield “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett.  92031106 (2008).
[Crossref]

Electron. Lett (1)

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett.  43, 573–574, (2007).
[Crossref]

IEEE J. Quantum Electron (1)

M. Schubert and F. Rana, “Analysis of Terahertz Surface Emitting Quantum-Cascade Lasers,” IEEE J. Quantum Electron.  42, 257 (2006).
[Crossref]

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

S. Kumar and A. W. M. Lee “Resonant-phonon terahertz quantum-cascade lasers and video-rate terahertz imaging,” IEEE J. Sel. Top. Quantum Electron.  14, 333–344 (2008).
[Crossref]

Nat. Photonics (1)

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie “Vertically emitting microdisk lasers,” Nat. Photonics 3, 46–49 (2009).
[Crossref]

Nature (1)

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417, 156–159 (2002).
[Crossref] [PubMed]

Nature Photonics (1)

B. S. Williams, “Terahertz quantum-cascade lasers,” Nature Photonics 1, 517–525 (2007).
[Crossref]

Opt. Express (6)

Opt. Lett (1)

A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett.  32, 2840–2842, (2007).
[Crossref]

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Figures (5)

Fig. 1.
Fig. 1. Three dimensional modeling of the laser ridge. Only one unit cell of the grating is considered, and a top view of the electric field distribution of the eigenmodes is plotted. The propagation direction is indicated by the arrow. a), b) Lowest loss modes of a design taken from [14], c),d) lowest loss modes of the design in this work.

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Fig. 2.
Fig. 2. (a). Top view of a fabricated device, the dark grey at the end of the grating metallization are the Cr pads that act as end absorbers. (b). Enlarged view of the grating, the slits are kept narrow, in order to maintain uniform pumping, and extend over a large part of the waveguide to avoid anti-guiding effects. One period is 27.3 μm.

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Fig. 3.
Fig. 3. (a). Computed (columns) and measured (red line) spectra of the device with a period of 27.3 μm and a grating duty-cycle of 90 % , depicted in Fig. 2. The computed spectrum is obtained by a two dimensional eigenfrequency analysis. The height of the green bars indicates the radiative efficiency and that of the blue ones the value of the quality factor. The right panel shows the magnetic field of the computed eigenmode corresponding to the lasing resonance in panel a), at the center of the resonator (b), and at the end of the resonator (c). The small shift in the mode with respect to the grating at the end leads to the surface emission.

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Fig. 4.
Fig. 4. (a). Vertically emitted peak power vs. current of a device operated with 800 ns pulses at 50 kHz repetition rate. No collection optics is employed, and the values are not corrected for the cryostat window. For the current density, the device area was assumed to be 200×1800 μm. (extension of the metallization). The inset shows the measured spectrum on a logarithmic scale. A side-mode suppression ratio of more than 20 dB is observed. (b). Far-field pattern of the device. The blue and red line show computed and measured far-field, respectively. The angle is measured with respect to the surface normal of the device, in the plane formed by surface normal and waveguide direction.

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Fig. 5.
Fig. 5. (a). Comparison between a standard and a modified grating, each with a period of 30 μm and a grating duty-cycle of 80 %. Left and right panel show a standard and a modified grating respectively. By introducing two small phase-shifts, the surface losses can be increased by a factor of 5, while maintaining a favorable spectrum. Resonances above the photonic band-gap are not plotted, as they have low quality factors. (b). Computed far-field of the highest quality factor mode of the modified grating.

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Equations (1)

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∇ · ( 1 n 2 ( x , y ) ∇ H z ) = ω 2 c 2 H z

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