3 November 2016 Photocurrent enhancement by utilizing unidirectional excitation of surface plasmons
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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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Mehdi Afshari Bavil, Mehdi Afshari Bavil, Zhi Liu, Zhi Liu, Wuwen Zhou, Wuwen Zhou, Chuanbo Li, Chuanbo Li, Buwen Cheng, Buwen Cheng, } "Photocurrent enhancement by utilizing unidirectional excitation of surface plasmons", Proc. SPIE 10028, Plasmonics II, 100280I (3 November 2016); doi: 10.1117/12.2246135; https://doi.org/10.1117/12.2246135


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