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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry Van Driel
  • Vol. 26, Iss. 8 — Aug. 1, 2009
  • pp: 1484–1491

Design of quantum cascade microcavity lasers based on Q factor versus etching depth

Jing Li, Yue-De Yang, and Yong-Zhen Huang  »View Author Affiliations


JOSA B, Vol. 26, Issue 8, pp. 1484-1491 (2009)
http://dx.doi.org/10.1364/JOSAB.26.001484


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Abstract

The choice of the etching depth for semiconductor microcavities is a compromise between a high Q factor and a difficult technique in a practical fabricating process. In this paper, the influences of the etching depth on mode Q factors for mid-infrared quantum cascade microcylinder and microsquare lasers around 4.8 and 7.8 μ m are simulated by three-dimensional (3D) finite-difference time-domain (FDTD) techniques. For the microcylinder and the microsquare resonators, the mode Q factors of the whispering-gallery modes (WGMs) increase exponentially and linearly with the increase in the etching depth, respectively. Furthermore, the mode Q factors of some higher order transverse WGMs may be larger than that of the fundamental transverse WGM in 3D microsquares. Based on the field distribution of the vertical multilayer slab waveguide and the mode Q factors versus the etching depth, the necessary etching depth is chosen at the position where the field amplitude is 1% of the peak value of the slab waveguide. In addition, the influences of sidewall roughness on the mode Q factors are simulated for microsquare resonators by 2D FDTD simulation.

© 2009 Optical Society of America

OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(140.3948) Lasers and laser optics : Microcavity devices
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: March 20, 2009
Manuscript Accepted: May 3, 2009
Published: July 2, 2009

Citation
Jing Li, Yue-De Yang, and Yong-Zhen Huang, "Design of quantum cascade microcavity lasers based on Q factor versus etching depth," J. Opt. Soc. Am. B 26, 1484-1491 (2009)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-8-1484

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