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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Three-dimensional control of self-assembled quantum dot configurations.

Michael K Yakes1, Cory D Cress, Joseph G Tischler

  • 1Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375, USA.

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|June 19, 2010
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Summary

We developed novel molecular beam epitaxy techniques to grow 3D quantum dot structures on templates. This method enhances quantum dot network fabrication for advanced applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Physics

Background:

  • Quantum dots are crucial for advanced electronic and photonic devices.
  • Controlled growth of three-dimensional (3D) quantum dot (QD) configurations remains a challenge.
  • Existing methods often struggle to integrate lithographic patterning with self-assembled growth.

Purpose of the Study:

  • To demonstrate novel techniques for fabricating 3D quantum dot structures.
  • To explore the use of molecular beam epitaxy (MBE) on faceted templates.
  • To investigate methods for achieving configurational uniformity in QD growth.

Main Methods:

  • Utilizing molecular beam epitaxy (MBE) on faceted template islands.
  • Employing molecular beam shadowing for selective nucleation on template edges.
  • Inducing strain for planar-to-3D structural conversion.
  • Characterizing QD morphology and uniformity using cross-sectional scanning tunneling microscopy (X-STM) and atomic force microscopy (AFM).
  • Correlating structural data with photoluminescence (PL) measurements.

Main Results:

  • Achieved novel QD geometries via selective nucleation on template edges.
  • Successfully converted planar QD configurations into 3D structures through strain-induced stacking.
  • Observed high configurational uniformity in the resulting 3D QD structures.
  • Demonstrated bright photoluminescence spectra from the 3D structures, indicating efficient light emission.
  • Validated the integration of lithographic nucleation sites with self-assembled QD growth.

Conclusions:

  • The demonstrated MBE techniques offer an improved method for fabricating 3D quantum dot structures.
  • These techniques enable the creation of complex quantum dot networks by combining lithographic patterning with self-assembly.
  • The findings pave the way for advanced quantum dot-based devices and materials.