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

Jung-Hwan Song, Jisu Kim, Hoon Jang, In Yong Kim, Indra Karnadi, Jonghwa Shin, Jung H. Shin and Yong-Hee Lee ()
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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)
Yong-Hee Lee: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms8080

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