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Two-photon autocorrelation measurements on a single InGaN/GaN quantum dot
Daniel Collins1, Anas Jarjour, Maria Hadjipanayi
1Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
Nanotechnology
|May 28, 2009
Summary
Researchers used interferometric autocorrelation to study non-linear absorption in Indium Gallium Nitride/Gallium Nitride (InGaN/GaN) quantum dots. The findings confirm a two-photon absorption process, revealing the unique optical properties of these nanostructures.
Area of Science:
- Optoelectronics
- Materials Science
- Quantum Optics
Background:
- Indium Gallium Nitride/Gallium Nitride (InGaN/GaN) quantum dots are crucial for optoelectronic devices.
- Understanding their optical properties, particularly non-linear absorption, is essential for device optimization.
Purpose of the Study:
- To investigate non-linear absorption mechanisms in single InGaN/GaN quantum dots.
- To characterize the optical behavior of these nanostructures under varying excitation intensities.
Main Methods:
- Utilized interferometric autocorrelation measurements.
- Analyzed photoluminescence signal dependence on excitation intensity.
- Examined the asymmetric collinear autocorrelation trace.
Main Results:
- Observed a near-quadratic dependence of the photoluminescence signal on excitation intensity.
- The autocorrelation trace confirmed a two-photon absorption process.
- Identified an intermediate virtual state involved in the absorption.
Conclusions:
- The study unambiguously confirms two-photon absorption in InGaN/GaN quantum dots.
- Highlights the significant non-linear optical properties of these quantum dot structures.
- Provides insights for advanced optoelectronic device design.
