Abstract
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.
Original language | English (US) |
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Pages (from-to) | 1140141-1140145 |
Number of pages | 5 |
Journal | Journal of Semiconductors |
Volume | 31 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2010 |
Keywords
- Distributed feedback lasers
- Quantum cascade laser
- Surface emission
- Surface plasmon waveguide
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Materials Chemistry