Abstract
The evolution of surface plasmon (SP) supermodes through the
effective coupling of isolated SP modes in a semiinsulating quantum
cascade laser (QCL) waveguide is thoroughly discussed here. The
effect of varying the material and geometric parameters of
GaSb/AlGaSb QCL operating at 3.0 THz are thoroughly studied using a
full-vectorial finite-element method. It was observed that this
structure is prone to mode degeneration caused by resonant
interaction of the lasing mode with a higher order plasmon mode. An
optimized design is also proposed to suppress such adverse affects
and highly divergent field profiles arising from the generation of
higher order lateral modes.
© 2011 IEEE
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