Analysis of surface emitting distributed-feedback quantum cascade laser based on a surface-plasmon w

• 作 者: 郭万红 陆全勇 刘俊岐 张伟 江宇超 李路 王利军 刘峰奇 王占国
• 机 构: Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors,Chinese Academy of Sci
• 出 处: 半导体学报
• 发表日期: 2010年11期
• 关键词: waveguide plasmon cascade grating realized exact dielectric silver length Pallad

An analysis of a surface emitting distributed-feedback quantum cascade laser(DFB QCL) based on a surface-plasmon waveguide is presented.The second-order grating realized by the sole patterning of the top metal provides strong feedback.The analysis is based on a coupled-mode theory derived from exact Floquet-Bloch solutions of the infinite periodic structure.The surface outcoupling efficiency and threshold gain for the optimized device design are 43%and 12 cm~(-1),respectively,which represent great improvements on the conventional dielectric waveguide based DFB QCL with typical values of 17.5%and 20 cm~(-1).

An analysis of a surface emitting distributed-feedback quantum cascade laser (DFB QCL) based on a surface-plasmon waveguide is presented. The second-order grating realized by the sole patterning of the top metal provides strong feedback. The analysis is based on a coupled-mode theory derived from exact Floquet-Bloch solutions of the infinite periodic structure. The surface outcoupling efficiency and threshold gain for the optimized device designs are 43% and 12 cm -1, respectively, which represent great improvements on the conventional The dielectric waveguide based DFB QCL with typical values ​​of 17.5% and 20 cm -1.