Electron Transport and Terahertz Gain in Quantum-Dot Cascades

Nenad Vukmirovic; Dragan Indjin; Zoran Ikonic; Paul Harrison

doi:10.1109/LPT.2007.912533

Electron Transport and Terahertz Gain in Quantum-Dot Cascades

Nenad Vukmirovic, Dragan Indjin, Zoran Ikonic, Paul Harrison

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Electron transport through quantum-dot (QD) cascades was investigated using the formalism of nonequilibrium Green's functions within the self-consistent Born approximation. Polar coupling to optical phonons, deformation potential coupling to acoustic phonons, as well as anharmonic decay of longitudinal optical phonons were included in the simulation. A QD cascade laser structure comprising two QDs per period was designed and its characteristics were simulated. Significant values of population inversion enabling lasing in the terahertz frequency range were predicted, with operating current densities being more than an order of magnitude smaller than in existing terahertz quantum-well-based quantum-cascade lasers.

Original language	English
Pages (from-to)	129-131
Number of pages	3
Journal	IEEE Photonics Technology Letters
Volume	20
Issue number	2
Early online date	7 Jan 2008
DOIs	https://doi.org/10.1109/LPT.2007.912533
Publication status	Published - 15 Jan 2008
Externally published	Yes

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AU - Ikonic, Zoran

AU - Harrison, Paul

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Y1 - 2008/1/15

N2 - Electron transport through quantum-dot (QD) cascades was investigated using the formalism of nonequilibrium Green's functions within the self-consistent Born approximation. Polar coupling to optical phonons, deformation potential coupling to acoustic phonons, as well as anharmonic decay of longitudinal optical phonons were included in the simulation. A QD cascade laser structure comprising two QDs per period was designed and its characteristics were simulated. Significant values of population inversion enabling lasing in the terahertz frequency range were predicted, with operating current densities being more than an order of magnitude smaller than in existing terahertz quantum-well-based quantum-cascade lasers.

AB - Electron transport through quantum-dot (QD) cascades was investigated using the formalism of nonequilibrium Green's functions within the self-consistent Born approximation. Polar coupling to optical phonons, deformation potential coupling to acoustic phonons, as well as anharmonic decay of longitudinal optical phonons were included in the simulation. A QD cascade laser structure comprising two QDs per period was designed and its characteristics were simulated. Significant values of population inversion enabling lasing in the terahertz frequency range were predicted, with operating current densities being more than an order of magnitude smaller than in existing terahertz quantum-well-based quantum-cascade lasers.

KW - Electron transport

KW - quantum dots (QDs)

KW - quantum-cascade lasers (QCLs)

KW - terahertz

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JO - IEEE Photonics Technology Letters

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Electron Transport and Terahertz Gain in Quantum-Dot Cascades

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