High-transmission ridge nanoapertures for quantum dot devices

ORAL

Abstract

We report on double-ridge apertures to enhance the coupling between a single quantum dot (QD) and optical field. The double-ridge aperture has two metallic tips protruding inward and facing each other, which work as an effective antenna for a QD just below the tips. We performed FDTD simulation to optimize the apertures, and fabricated them on InAs/GaAs QDs emitting at 960nm. By single-dot PL spectroscopy through the double-ridge aperture, we demonstrated 5-6 times enhancement in PL extraction efficiency, compared to that through a conventional circular aperture. Because our double-ridge aperture works not only as an optical antenna but also as an electrode for a QD, it will be applicable to electrically-driven photon generators or photon detectors.

*This work was supported by Japanese Special Coordination Funds for Promoting Science and Technology.

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Authors

  • Akihiro Kirihara

    • NEC Corporation

  • Junichi Fujikata

    • NEC Corporation

  • Toshihiro Nakaoka

    • University of Tokyo

  • Naoto Kumagai

    • University of Tokyo

  • Katsuyuki Watanabe

    • University of Tokyo

  • Masayuki Shirane

    • NEC Corporation

  • Shunsuke Ohkouchi

    • NEC Corporation

  • Shinichi Yorozu

    • NEC Corporation

  • Yasuhiko Arakawa

    • University of Tokyo