Dresden 2006 – scientific programme

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HL: Halbleiterphysik

HL 9: Poster I

HL 9.96: Poster

Monday, March 27, 2006, 15:15–17:45, P3

Study of vertical-cavity surface-emitting laser structures in the strong coupling regime by modulation spectroscopy — •B. Metzger, G. Blume, P.J. Klar, and W. Heimbrodt — Dept. Physics and WZMW, Philipps-University of Marburg, Germany

In recent years, various modulation spectroscopic methods have been successfully applied for characterizing vertical-cavity surface-emitting laser (VCSEL) structures. Most VCSEL structures employed in devices show only a weak coupling between the cavity mode and the lowest quantum well exciton in the active region. The spectral line shapes of the corresponding Δ R/R signals in and off resonance are well understood. However, so far there are no reports of modulation spectroscopic studies of VCSEL structures in the strong coupling regime. Here we present first contactless electroreflectance (CER) results on a VCSEL structure with 12 strain-compensated (Ga,In)As/Ga(P,As) quantum wells in the active region of a 2λ-cavity exhibiting a large Rabi splitting. The degree of cavity detuning was varied by changing the sample temperature. The CER spectra obtained will be analysed and compared with those of VCSEL in the weak coupling regime.