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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 18, Iss. 10 — Oct. 1, 2001
  • pp: 1497–1511

Radiation scattering by apertures in vertical-cavity surface-emitting laser cavities and its effects on mode structure

S. Riyopoulos and D. Dialetis  »View Author Affiliations

JOSA B, Vol. 18, Issue 10, pp. 1497-1511 (2001)

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Microcavities with subwavelength features, such as oxide apertures and etched-mesa edges, suffer wide-angle scattering that cannot be captured by the paraxial propagation limit; hence the scattering cannot be fully accounted for by index guiding or by lenslike phase shifts. We present a systematic treatment by using the Born approximation in the vector Maxwell equations. We then introduce the scattering losses in the cavity round-trip matrix, by using a Gauss–Laguerre representation of the cavity modes. Optimization of the round-trip coefficient including confinement, diffraction, and scattering losses yields the mode waist in laterally open vertical cavity surface emitting laser (VCSEL) cavities. A simple equation relating the current aperture to mode spot size is obtained. The analytic results are applied to etched-mesa and oxide-confined VCSEL designs. Predictions for the mode waist and threshold current are comparable with experimental results in oxide-confined VCSELs.

© 2001 Optical Society of America

OCIS Codes
(140.5960) Lasers and laser optics : Semiconductor lasers
(250.7260) Optoelectronics : Vertical cavity surface emitting lasers
(290.0290) Scattering : Scattering

S. Riyopoulos and D. Dialetis, "Radiation scattering by apertures in vertical-cavity surface-emitting laser cavities and its effects on mode structure," J. Opt. Soc. Am. B 18, 1497-1511 (2001)

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