| Summary: | 碩士 === 國立交通大學 === 電子工程學系 電子研究所 === 102 === It’s known that the surface plasmons can enhance the responsivity of quantum dot infrared photodetectors. In this thesis, we make the metal grating on QDIPs, which can generate surface plasmons between metal and GaAs. Then, we make the metal grating with the appropriate periodic structure for the absorption wavelength of QDIPs, which is the same as the resonant wavelength because of exciting surface plasmons. The responsivity of QDIPs can be the most efficient upgrade. We further observed that when the surface plasmon closer to the QDIPs active layer, the detection efficiency of light will rise. Finally, we actually make two different structures periodic metal grating on the quantum dot infrared photodetectors, metal photonic crystal (MPC) and corrugated metal surface (CMS) , and then we measure the responsivity of QDIPs. The results show that the CMS structure on QDIPs are up to 10 times improvement in the responsivity, and much higher than the MPC structure, the overall performance characteristics of QDIPs significantly increase substantially.
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