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7 March 2014 Feasibility of GaN-based room temperature THz laser in a spoof plasmon waveguide
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We propose and study the feasibility of a THz GaN/AlGaN quantum cascade laser (QCL) consisting of only five periods with confinement provided by a spoof surface plasmon (SSP) waveguide for room temperature operation. The QCL design takes advantages of the large optical phonon energy and the ultrafast phonon scattering in GaN that allow for engineering favorable laser state lifetimes, and the SSP waveguide provides the optical confinement for the ultrathin QCL. Our analysis has shown that the waveguide loss is sufficiently low for the QCL to reach its threshold at the injection current density around 6 kA/cm2 at room temperature.
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Greg Sun, Jacob B. Khurgin, and Din P. Tsai "Feasibility of GaN-based room temperature THz laser in a spoof plasmon waveguide", Proc. SPIE 8984, Ultrafast Phenomena and Nanophotonics XVIII, 89840B (7 March 2014);

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