Mr. Carl H. Fischer Profile

Carl H. Fischer

at Univ of Michigan

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Proceedings Article | 11 May 2004 Paper

Quantum dot intersublevel light emitters

Pallab Bhattacharya, Carl Fischer, Sanjay Krishna, Zetian Mi, Xiaohua Su

Proceedings Volume 5365, (2004) https://doi.org/10.1117/12.529064

KEYWORDS: Quantum dots, Gallium arsenide, Heterojunctions, Infrared radiation, Quantum wells, Light sources, Electroluminescence, Photons, Gallium, Far infrared

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Self-organized quantum dots have been used with great success in quantum dot infrared photodetectors (QDIPs), wherein intersublevel transitions between confined electron states are utilized. Many attributes make self-organized quantum dots attractive for the realization of intersublevel infrared light sources for the mid- to far-infrared wavelength range. Intersublevel electroluminescence has been demonstrated from both bipolar and quantum cascade unipolar structures, with coherent emission observed in the bipolar case. Coherent mid-infrared emission from bipolar selforganized quantum dot devices has been observed at room temperature, centered at 13μm. The cavity is designed to support both intersublevel and interband light, so that interband lasing can quickly depopulate the ground state of the quantum dots. Devices show a distinct turn-on at 1.1kA/cm² but suffer from broad linewidth. Unipolar quantum dot cascade structures are being designed with a strain-compensating GaAs_1-xN_x / GaAs injector region. Using this material system, structures with as many as 30 cascade periods have been successfully grown by molecular beam epitaxy (MBE). TE polarized electroluminescence at 22μm has been observed from such structures at cryogenic temperatures.

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