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Thermal properties of THz quantum cascade lasers based on different optical waveguide configurations

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9 Author(s)
Vitiello, Miriam S. ; CNR-INFM Regional Laboratory LIT3, Dipartimento Interateneo di Fisica “M. Merlin,” Università degli Studi di Bari, Via Amendola 173, 70126 Bari, Italy ; Scamarcio, Gaetano ; Spagnolo, Vincenzo ; Alton, J.
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We compare the thermal properties of THz quantum cascade lasers (QCLs) fabricated with metal-metal optical waveguides based on Au/Au or In/Au wafer bonding. This information was obtained from the analysis of microprobe band-to-band photoluminescence spectra measured on devices operating in continuous wave (cw). The experimental normalized thermal resistances (RL*), show that the use of Au/Au wafer bonding optimizes the heat dissipation. Comparison with surface-plasmon based THz QCLs, demonstrates that the use of metal-metal wafer bonding can allow cw operation at progressively higher temperatures.

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Applied Physics Letters  (Volume:89 ,  Issue: 2 )