2013年2月
Unidirectional Spaser in Symmetry-Broken Plasmonic Core-Shell Nanocavity
SCIENTIFIC REPORTS
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- 巻
- 3
- 号
- 開始ページ
- 1241
- 終了ページ
- 1
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/srep01241
- 出版者・発行元
- NATURE PUBLISHING GROUP
The spaser, a quantum amplifier of surface plasmons by stimulated emission of radiation, is recognized as a coherent light source capable of confining optical fields at subwavelength scale. The control over the directionality of spasing has not been addressed so far, especially for a single-particle spasing nanocavity where optical feedback is solely provided by a plasmon resonance. In this work we numerically examine an asymmetric spaser - a resonant system comprising a dielectric core capped by a metal semishell. The proposed spaser emits unidirectionally along the axis of the semishell; this directionality depends neither on the incident polarization nor on the incident angle of the pump. The spasing efficiency of the semishell-capped resonator is one order of magnitude higher than that in the closed core-shell counterpart. Our calculations indicate that symmetry breaking can serve as a route to create unidirectional, highly intense, single-particle, coherent light sources at subwavelength scale.
- リンク情報
- ID情報
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- DOI : 10.1038/srep01241
- ISSN : 2045-2322
- Web of Science ID : WOS:000314710400006