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Fast and bright spontaneous emission of Er3+ ions in metallic nanocavity

Author

Listed:
  • Jung-Hwan Song

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Jisu Kim

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Hoon Jang

    (Korea Advanced Institute of Science and Technology (KAIST))

  • In Yong Kim

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Indra Karnadi

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Jonghwa Shin

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Jung H. Shin

    (Korea Advanced Institute of Science and Technology (KAIST)
    Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST))

  • Yong-Hee Lee

    (Korea Advanced Institute of Science and Technology (KAIST))

Abstract

By confining light in a small cavity, the spontaneous emission rate of an emitter can be controlled via the Purcell effect. However, while Purcell factors as large as ∼10,000 have been predicted, actual reported values were in the range of about 10–30 only, leaving a huge gap between theory and experiment. Here we report on enhanced 1.54-μm emission from Er3+ ions placed in a very small metallic cavity. Using a cavity designed to enhance the overall Purcell effect instead of a particular component, and by systematically investigating its photonic properties, we demonstrate an unambiguous Purcell factor that is as high as 170 at room temperature. We also observe >90 times increase in the far-field radiant flux, indicating that as much as 55% of electromagnetic energy that was initially supplied to Er3+ ions in the cavity escape safely into the free space in just one to two optical cycles.

Suggested Citation

  • Jung-Hwan Song & Jisu Kim & Hoon Jang & In Yong Kim & Indra Karnadi & Jonghwa Shin & Jung H. Shin & Yong-Hee Lee, 2015. "Fast and bright spontaneous emission of Er3+ ions in metallic nanocavity," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8080
    DOI: 10.1038/ncomms8080
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