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Design for an efficient single photon source based on a single quantum dot embedded in a parabolic solid immersion

Vasanthan Devaraj, Jongseo Baek, Yudong Jang

    Optics Express
    |May 4, 2016
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    Summary

    We developed a single photon emitter using quantum dots and parabolic solid immersion lenses (pSILs). This design achieves high photon collection efficiency and broadband performance, simplifying fabrication.

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    Area of Science:

    • Quantum optics
    • Nanophotonics
    • Solid-state physics

    Background:

    • Single photon emitters are crucial for quantum technologies.
    • Efficient light extraction from quantum emitters remains a challenge.
    • Parabolic solid immersion lenses (pSILs) offer potential for enhanced light collection.

    Purpose of the Study:

    • To design and simulate a single photon emitter with high photon collection efficiency.
    • To investigate the impact of a dual pSIL structure on emitter performance.
    • To assess the broadband operation and fabrication tolerance of the proposed design.

    Main Methods:

    • Numerical simulations were employed to model the photon emission and collection.
    • A single quantum dot was embedded within a single-mode pSIL and a capping low-index pSIL.
    • The design's performance was evaluated across varying numerical apertures (NA).

    Main Results:

    • High photon collection efficiencies of 64% (NA=0.41) and 78% (NA=0.5) were predicted.
    • The design demonstrated excellent far-field emission properties and broadband operation over a 100 nm range.
    • Good geometric tolerance was observed, beneficial for device fabrication.

    Conclusions:

    • The combined pSIL design significantly enhances photon collection efficiency for quantum dot emitters.
    • The proposed emitter exhibits robust performance and fabrication feasibility.
    • This work presents a promising approach for efficient single photon sources.