We compare a set of experimental lattice temperature profiles measured in a surface-emitting terahertz (THz) quantum-cascade laser (QCL) with the results of a 2-D anisotropic heat diffusion model. We evaluate the temperature dependence of the cross-plane thermal conductivity (kappaperp) of the active region which is known to be strongly anisotropic due to its superlattice-like nature. Knowledge of kappaperp and its temperature dependence is crucial in order to improve the temperature performance of THz QCLs and this has been used to investigate the longitudinal lattice temperature distribution of the active region and to compare the thermal properties of metal-metal and semi-insulating surface-plasmon THz optical waveguides using a 3-D anisotropic heat diffusion model.
Thermal Modeling of Terahertz Quantum-Cascade Lasers: Comparison of Optical Waveguides / Evans, C. A.; Indjin, D.; Ikonić, Z.; Harrison, P.; Vitiello, M. S.; Spagnolo, Vincenzo Luigi; Scamarcio, G.. - In: IEEE JOURNAL OF QUANTUM ELECTRONICS. - ISSN 0018-9197. - 44:7(2008), pp. 680-685. [10.1109/JQE.2008.922327]
Thermal Modeling of Terahertz Quantum-Cascade Lasers: Comparison of Optical Waveguides
SPAGNOLO, Vincenzo Luigi;
2008-01-01
Abstract
We compare a set of experimental lattice temperature profiles measured in a surface-emitting terahertz (THz) quantum-cascade laser (QCL) with the results of a 2-D anisotropic heat diffusion model. We evaluate the temperature dependence of the cross-plane thermal conductivity (kappaperp) of the active region which is known to be strongly anisotropic due to its superlattice-like nature. Knowledge of kappaperp and its temperature dependence is crucial in order to improve the temperature performance of THz QCLs and this has been used to investigate the longitudinal lattice temperature distribution of the active region and to compare the thermal properties of metal-metal and semi-insulating surface-plasmon THz optical waveguides using a 3-D anisotropic heat diffusion model.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
