Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 9: Poster I
HL 9.26: Poster
Montag, 27. März 2006, 15:15–17:45, P3
Confined optical modes in monolithic ZnSe-based pillar microcavities — •H. Lohmeyer1, K. Sebald1, C. Kruse1, J. Gutowski1, D. Hommel1, J. Wiersig2, N. Baer2, and F. Jahnke2 — 1Institute of Solid State Physics, University of Bremen, P.O.Box 330 440, 28359 Bremen, Germany — 2Institute of Theoretical Physics, University of Bremen, P.O.Box 330 440, 28359 Bremen, Germany
We report on the successful realization and optical characterization of monolithic II-VI pillar microcavities (MCs) which are very promising for future applications such as single photon emitters at elevated temperatures or quantum-dot based vertical-cavity surface-emitting lasers in the blue-green spectral region.
VCSEL structures made of ZnCdSSe/ZnSSe λ-cavities and Bragg mirrors composed of ZnSSe and MgS/ZnCdSe superlattices have been fabricated by molecular-beam epitaxy. Airpost pillar MCs with diameters between 500 nm and 4 µm were fabricated by focused ion-beam etching. The discrete mode spectra of the pillars are studied by photoluminescence measurements.
The measured data show full agreement with calculations of the transmission spectra of the three-dimensional pillars based on a vectorial transfer-matrix method. Achievable Purcell factors well above 10 can be estimated from the measured quality factors and calculated mode volumes. First investigations of the coupling of quantum-dot like emitters to the pillar modes show a strong enhancement in the detected photoluminescence signal of the latter in resonance with modes of the cavity.
This work was supported by the Deutsche Forschungsgemeinschaft.