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

S. C. Lee, J. H. Kang, Q. Park, S. Krishna, S. R.J. Brueck

Research output: Contribution to journalArticle


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 ∼10 µm. 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.

Original languageEnglish
Pages (from-to)7618-7633
Number of pages16
JournalOptics Express
Issue number5
Publication statusPublished - 2020 Mar 2

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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