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Applied Physics Letters / Volume 96 / Issue 10 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 96, 101101 (2010); http://dx.doi.org/10.1063/1.3352121 (3 pages)

Anisotropic heat propagation velocity in quantum cascade lasers

Miriam S. Vitiello and Gaetano Scamarcio

CNR-Istituto di Fotonica e Nanotecnologie and Dipartimento Interateneo di Fisica “M. Merlin,” Università degli Studi di Bari “Aldo Moro”, Via Amendola 173, 70126 Bari, Italy

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(Received 24 December 2009; accepted 11 February 2010; published online 8 March 2010)

We report on the time-resolved measurement of the in-plane (v∥) and cross-plane (v┴) components of the heat transfer velocity in GaAs/Al0.15Ga0.85As quantum-cascade heterostructures. We compared the heating and cooling stages both in the active region and in the substrate with models of heat transfer in nanostructures. We found that v⊥ is reduced by a factor of ∼ 6.5 with respect to that of the corresponding bulk material due to the additional thermal resistance of each interface and to the phonon interference effects in the multilayered structure. The v∥ component is reduced by ∼ 30% due to interface roughness.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

aluminium compounds, anisotropic media, gallium arsenide, heat transfer, III-V semiconductors, inhomogeneous media, laser beams, phonons, quantum cascade lasers, thermal resistance

PACS

  • 42.55.Px

    Semiconductor lasers; laser diodes

  • 42.60.By

    Design of specific laser systems

  • 81.05.Xj

    Metamaterials for chiral, bianisotropic and other complex media

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3352121

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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