Fast and bright spontaneous emission of Er(3+) ions in metallic nanocavity.
Fast and bright spontaneous emission of Er(3+) ions in metallic nanocavity.
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DOI：
10.1038/ncomms8080
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发表时间：
2015-05-05
影响因子：
16.6
通讯作者：
Lee, Yong-Hee
中科院分区：
文献类型：
--
作者：
Song, Jung-Hwan;Kim, Jisu;Jang, Hoon;Kim, In Yong;Karnadi, Indra;Shin, Jonghwa;Shin, Jung H.;Lee, Yong-Hee
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. The Purcell effect predicts a spontaneous emission rate enhancement of several orders of magnitude, but experimental demonstrations have been much lower. Here, Song et al. show emission enhancement of Er3+ ions in a metallic nanocavity with a 170 Purcell factor at room temperature and 55% extraction efficiency.
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