Monolithic ZnTe-based pillar microcavities containing CdTe quantum dots |
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Authors: | Kruse Carsten Pacuski Wojciech Jakubczyk Tomasz Kobak Jakub Gaj Jan A Frank Kristian Schowalter Marco Rosenauer Andreas Florian Matthias Jahnke Frank Hommel Detlef |
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Affiliation: | Institute of Solid State Physics, Semiconductor Epitaxy, University of Bremen, PO Box 330 440, D-28334 Bremen, Germany. ckruse@ifp.uni-bremen.de |
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Abstract: | Micropillars of different diameters have been prepared by focused ion beam milling out of a planar ZnTe-based cavity. The monolithic epitaxial structure, deposited on a GaAs substrate, contains CdTe quantum dots embedded in a ZnTe λ-cavity delimited by two distributed Bragg reflectors (DBRs). The high refractive index material of the DBR structure is ZnTe, while for the low index material a short-period triple MgTe/ZnTe/MgSe superlattice is used. The CdTe quantum dots are formed by a novel Zn-induced formation process and are investigated by scanning transmission electron microscopy. Micro-photoluminescence measurements show discrete optical modes for the pillars, in good agreement with calculations based on a vectorial transfer matrix method. The measured quality factor reaches a value of 3100. |
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