Photoreflectance line shape symmetry and quantum-well ground-state exciton energy in vertical-cavity surface-emitting laser structures

Ghosh, Sandip; Hosea, Thomas J. C.; Constant, Stephanie B.
May 2001
Applied Physics Letters;5/21/2001, Vol. 78 Issue 21, p3250
Academic Journal
We report photoreflectance studies on the coupling between the Fabry-Perot cavity mode (CM) and the quantum well (QW) ground-state excitonic feature in vertical-cavity surface-emitting laser structures. Changes in the symmetry of the CM-QW spectral feature occur when the angle of incidence of the probe beam is altered. Using detailed simulations, we explain how this is related to an unusual reversal of the roles of the Seraphin coefficients and QW dielectric function, in determining the line shape. Our study suggests a way to find the exciton energy, in situations where a distinct QW feature is not seen because of large broadening of the QW dielectric function combined with high reflectivity of Bragg mirrors and relatively narrow CM width. © 2001 American Institute of Physics.


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