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Monolithic ZnTe-based pillar microcavities containing CdTe quantum dots.

Carsten Kruse1, Wojciech Pacuski, Tomasz Jakubczyk

  • 1Institute of Solid State Physics, Semiconductor Epitaxy, University of Bremen, PO Box 330 440, D-28334 Bremen, Germany. ckruse@ifp.uni-bremen.de

Nanotechnology
|June 10, 2011
PubMed
Summary
This summary is machine-generated.

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Researchers fabricated ZnTe-based micropillars with embedded CdTe quantum dots. Micro-photoluminescence confirmed discrete optical modes and a high quality factor of 3100, showing potential for optical devices.

Area of Science:

  • Semiconductor Nanostructures
  • Optoelectronics
  • Materials Science

Background:

  • Fabrication of semiconductor micropillars is crucial for developing advanced optical devices.
  • Quantum dots embedded in cavities offer unique light-matter interaction properties.
  • Distributed Bragg reflectors (DBRs) are essential for confining light within optical cavities.

Purpose of the Study:

  • To fabricate ZnTe-based micropillars containing CdTe quantum dots.
  • To investigate the optical properties of these micropillars.
  • To evaluate the performance of the fabricated structures for potential optoelectronic applications.

Main Methods:

  • Focused ion beam milling was used to create micropillars from a planar ZnTe-based cavity.
  • Monolithic epitaxial structures with CdTe quantum dots in a ZnTe lambda-cavity and MgTe/ZnTe/MgSe superlattice DBRs were grown.

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  • Scanning transmission electron microscopy (STEM) and micro-photoluminescence (μ-PL) measurements were performed.

    • Main Results:

    • Micropillars of varying diameters were successfully fabricated.
    • Micro-photoluminescence measurements revealed discrete optical modes within the micropillars.
    • A high quality factor (Q-factor) of 3100 was achieved, consistent with theoretical calculations.

    Conclusions:

    • The fabricated ZnTe-based micropillars with CdTe quantum dots exhibit promising optical properties.
    • The discrete optical modes and high Q-factor indicate suitability for microcavity applications.
    • The results demonstrate the potential of this fabrication approach for quantum dot-based optoelectronic devices.