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Proceedings Paper

Design and simulations of an electrically tunable quantum dot cascade laser
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Paper Abstract

We present here a novel design to form an artificial quantum dot with electrical confinement and apply it to a Quantum Cascade Laser structure to realize a Quantum Dot Cascade Laser. A two-dimensional finite element method has been used to numerically simulate the novel design of electrical formation of an artificial quantum dot. The size of the quantum dot is electrically tunable and can be applied to quantum cascade laser structure to reduce the non-radiative LO-phonon relaxation. Numerical modeling with cylindrical symmetry is custom developed using Comsol multiphysics to evaluate the electrical performance of the device and optimize it by varying design parameters, namely, the doping density of different layers and thickness of the cladding and active regions. The typical s-, p-, d- and f- wave functions have been calculated. Numerical simulations show that the energy level separation could be as large as 50 meV by electrical confinement. We also demonstrate the road map for the fabrication of such a device using a maskless super lens photolithography technique. We have achieved a uniform array of nano-contacts of size ~ 200nm, required for the device, using photolithographic technique with a UV source of λ ~ 400nm. The entire processing involves 7 photolithographic steps. This new device - "Quantum dot cascade laser", promises low threshold current density and high wall-plug efficiency.

Paper Details

Date Published: 3 September 2009
PDF: 10 pages
Proc. SPIE 7406, Nanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials, 74060Q (3 September 2009); doi: 10.1117/12.825408
Show Author Affiliations
Dibyendu Dey, Northwestern Univ. (United States)
Wei Wu, Northwestern Univ. (United States)
Omer Gokalp Memis, Northwestern Univ. (United States)
Hooman Mohseni, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 7406:
Nanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials
M. Saif Islam; A. Alec Talin; Stephen D. Hersee, Editor(s)

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