Design and simulation of an electrically tunable quantum dot cascade laser

Dibyendu Dey*, Wei Wu, Omer Gokalp Memis, Hooman Mohseni

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 LOphonon 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.

Original languageEnglish (US)
Title of host publicationNanoepitaxy
Subtitle of host publicationHomo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials
Volume7406
DOIs
StatePublished - Nov 23 2009
EventNanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials - San Diego, CA, United States
Duration: Aug 3 2009Aug 4 2009

Other

OtherNanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials
CountryUnited States
CitySan Diego, CA
Period8/3/098/4/09

Keywords

  • Quantum cascade laser (QCL)
  • Quantum dot (QD)
  • Quantum dot cascade laser (QDCL)
  • Super lens lithography (SLL)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Design and simulation of an electrically tunable quantum dot cascade laser'. Together they form a unique fingerprint.

  • Cite this

    Dey, D., Wu, W., Memis, O. G., & Mohseni, H. (2009). Design and simulation of an electrically tunable quantum dot cascade laser. In Nanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials (Vol. 7406). [74060Q] https://doi.org/10.1117/12.825408