Investigation of Tunable Single-Mode Quantum Cascade Lasers Via Surface-Acoustic-Wave Modulation
Quantum Electronics, IEEE Journal of（2013）
摘要
A novel distributed feedback quantum cascade laser (DFB-QCL) modulated by traveling surface acoustic wave (SAW) is proposed and theoretically studied. The device is based on a highly piezoelectric Zinc Oxide (ZnO) thin film applied directly on top of the QCL to enhance the SAW modulation of the device. To increase the coupling efficiency between the optical lasing mode and the SAW-induced DFB grating, air-waveguide and surface plasmon waveguide structures with two-section active regions are proposed. Simulation results show that a moderate coupling coefficient of ~ 2.5 cm-1 can be achieved for the structures, assuming high quality piezoelectric material and device fabrication can be achieved. The proposed scheme may provide a potentially alternative approach to achieve single-mode, tunable QCLs.
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关键词
ii-vi semiconductors,acousto-optical modulation,diffraction gratings,distributed feedback lasers,laser modes,laser tuning,optical fabrication,piezoelectric devices,piezoelectric semiconductors,piezoelectric thin films,quantum cascade lasers,semiconductor thin films,surface acoustic waves,surface plasmons,thin film devices,waveguide lasers,wide band gap semiconductors,zinc compounds,dfb-qcl,saw modulation,saw-induced dfb grating,zno,air-waveguide structures,coupling coefficient,device fabrication,distributed feedback quantum cascade laser,optical lasing mode,piezoelectric material,piezoelectric zinc oxide thin film,single-mode tunable qcl,surface plasmon waveguide structures,surface-acoustic-wave modulation,traveling surface acoustic wave,tunable single-mode quantum cascade lasers,two-section active regions,dfb lasers,intersubband transitions,mid-infrared,quantum cascade lasers (qcls)
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