A circular slit-groove surface plasmon polaritons (SPPs) launcher surrounding a photodetector is employed theoretically
to enhance the photocurrent of a typical Si-Ge photodetectors operating at telecommunication frequency regime. The slit
and grooves are designed such that the SPPs are focused at the center of the absorption layer of the photodetector to
result in additional electric current. Phase difference approach is applied to lead constructive interference between the
incident light impinging from the top and the SPPs propagating toward the photodetector. Simulation result proves the
interference and periodic behavior is observed. Finally the period of the groove, slit-groove distance, and slitphotodetector
distance is determined via simulation. Furthermore it was shown that photocurrent increases by
approximately 13-fold when the SPPs are introduced.
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