Multi-color quantum dot ensembles grown in selective-areas for shape-controlled broadband light source

Multi-color quantum dot (QD) ensembles were grown by selective-area growth method to realize a shape-controlled broadband light source. By using a metal-mask, QD ensembles and strain reducing layer (SRL) were formed in selective areas on a wafer. The SRL thickness was varied to achieve appropriate s...

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Bibliographic Details
Published in:Journal of crystal growth 2011-05, Vol.323 (1), p.191-193
Main Authors: Ozaki, N., Takeuchi, K., Ohkouchi, S., Ikeda, N., Sugimoto, Y., Asakawa, K., Hogg, R.A.
Format: Article
Language:English
Subjects:
A3. Molecular beam epitaxy
A3. Selective epitaxy
Applied sciences
B1. Nanomaterials
B2. Semiconducting III–V materials
Broadband
Cross-disciplinary physics: materials science
rheology
Crystal growth
Electronics
Emission
Exact sciences and technology
Excitation spectra
Injection current
Light sources
Materials science
Molecular electronics, nanoelectronics
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Other topics in nanoscale materials and structures
Physics
Quantum dots
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Spectral emissivity
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Summary:Multi-color quantum dot (QD) ensembles were grown by selective-area growth method to realize a shape-controlled broadband light source. By using a metal-mask, QD ensembles and strain reducing layer (SRL) were formed in selective areas on a wafer. The SRL thickness was varied to achieve appropriate shifts in the peak wavelength of the QD emission spectrum up to 90nm. A summation of PL spectra obtained from the multi-color QD ensembles shows a broadband emission spectrum with a width of approximately 120nm, even though this spectrum is attributed to the ground state emissions of these QD ensembles. A current-induced broadband light source such as a superluminescent diode (SLD) based on the multi-color QD ensembles is expected to have an emission spectrum with a width of more than 120nm owing to the combination of excited state emissions. Furthermore, a desired shape of the SLD spectrum can be obtained by controlling the injection current applied to each QD ensemble. This approach is promising for a shape-controlled broadband SLD, and it is particularly applicable to optical coherence tomography (OCT).
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2010.11.168