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Updated: Jun 25, 2026
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Site-controlled InGaAs quantum dots with tunable emission energy.
Marco Felici1, Pascal Gallo, Arun Mohan
1Laboratory of Physics of Nanostructures, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland. marco.felici@epfl.ch
Small (Weinheim an Der Bergstrasse, Germany)
|February 25, 2009
Summary
Researchers achieved precise positioning and tunable emission for semiconductor quantum dots (QDs) using patterned substrates. This breakthrough enables advanced nanophotonic devices by controlling QD placement and spectral properties.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Semiconductor quantum dots (QDs) are crucial for nanophotonic devices, requiring precise spatial and spectral control for integration with optical cavities.
- Existing methods for QD growth often struggle with achieving both high site fidelity and uniform optical properties.
Purpose of the Study:
- To report the properties of ordered Indium Gallium Arsenide/Gallium Arsenide (InGaAs/GaAs) quantum dots (QDs).
- To demonstrate precise control over QD position and emission energy using patterned substrates.
- To investigate the impact of substrate patterning on QD growth and optical characteristics.
Main Methods:
- Organometallic chemical vapor deposition (OMCVD) growth of InGaAs/GaAs QDs.
- Substrate patterning with pyramidal recesses to direct QD nucleation.
- Photoluminescence spectroscopy to analyze QD emission properties and uniformity.
Main Results:
- Achieved near-perfect (<10 nm) site control for single QD growth within each pyramidal recess.
- Observed efficient and uniform photoluminescence from ordered QD arrays with low inhomogeneous broadening (<10 meV).
- Demonstrated fine-tuning of QD emission energy by controlling pyramid size and pattern position.
Conclusions:
- Substrate patterning effectively controls QD nucleation site and growth kinetics.
- The developed method allows for precise spatial arrangement and tunable emission of InGaAs/GaAs QDs.
- This approach is highly promising for fabricating advanced nanophotonic devices requiring matched QD-cavity systems.
