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

• Published in: Journal of semiconductors Vol. 31; no. 11; pp. 62 - 66
• Main Authors: Guo, Wanhong, Lu, Quanyong, Liu, Junqi, Zhang, Wei, Jiang, Yuchao, Li, Lu, Wang, Lijun, Liu, Fengqi, Wang, Zhanguo
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.11.2010
• Subjects: 分布反馈; 分布式反馈; 基础; 等离子体波导; 耦合效率; 表面发光; 量子级联激光器; 金属图案
• ISSN: 1674-4926
• DOI: 10.1088/1674-4926/31/11/114014

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.