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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 8 — Apr. 13, 2009
  • pp: 6703–6709

Finite size effects in surface emitting Terahertz quantum cascade lasers

Lukas Mahler, Alessandro Tredicucci, Fabio Beltram, Christoph Walther, Harvey E. Beere, and David A. Ritchie  »View Author Affiliations

Optics Express, Vol. 17, Issue 8, pp. 6703-6709 (2009)

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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

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(240.6680) Optics at surfaces : Surface plasmons
(250.7270) Optoelectronics : Vertical emitting lasers
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

Original Manuscript: January 23, 2009
Revised Manuscript: March 26, 2009
Manuscript Accepted: April 5, 2009
Published: April 8, 2009

Lukas Mahler, Alessandro Tredicucci, Fabio Beltram, Christoph Walther, Harvey E. Beere, and David A. Ritchie, "Finite size effects in surface emitting Terahertz quantum cascade lasers," Opt. Express 17, 6703-6709 (2009)

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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]
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  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]
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