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Quantum efficiency of plasmonic-coupled quantum dot infrared photodetectors for single-color detection: the upper limit of plasmonic enhancement

Authors
Lee, S. C.Kang, J-HPark, Q.Krishna, S.Brueck, S. R. J.
Issue Date
2-3월-2020
Publisher
OPTICAL SOC AMER
Citation
OPTICS EXPRESS, v.28, no.5, pp.7618 - 7633
Indexed
SCIE
SCOPUS
Journal Title
OPTICS EXPRESS
Volume
28
Number
5
Start Page
7618
End Page
7633
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/57338
DOI
10.1364/OE.386844
ISSN
1094-4087
Abstract
We report a measurement of the quantum efficiency for a surface plasma wave (SPW)coupled InAs/In0.15Ga0.85As/GaAs dots-in-a-well (Dwell) quantum dot infrared photodetector (QDIP) having a single-color response at similar to 10 mu m. A gold film perforated with a square array of complex, non-circular apertures is employed to manipulate the near-fields of the fundamental SPW. The quantum efficiency is quantitatively divided into absorption efficiency strongly enhanced by the SPW, and collection efficiency mostly independent of it. In the absorption efficiency, the evanescent near-fields of the fundamental SPW critically enhances QDIP performance but undergoes the attenuation by the absorption in the Dwell that ultimately limits the quantum efficiency. For the highest quantum efficiency available with plasmonic coupling, an optimal overlap between Dwell and SPW near-fields is required. Based on experiment and simulation, the upper limit of the plasmonic enhancement in quantum efficiency for the present device is addressed. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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