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srep01241.pdf | 951.46 kB | Adobe PDF | 見る/開く |
タイトル: | Unidirectional Spaser in Symmetry-Broken Plasmonic Core-Shell Nanocavity |
著者: | Meng, Xiangeng Guler, Urcan Kildishev, Alexander V. Fujita, Koji https://orcid.org/0000-0002-1700-0889 (unconfirmed) Tanaka, Katsuhisa https://orcid.org/0000-0002-1409-2802 (unconfirmed) Shalaev, Vladimir M. |
キーワード: | Nanoparticles Solid-state lasers Nanocavities Nanophotonics and plasmonics |
発行日: | 7-Feb-2013 |
出版者: | Nature publishing group |
誌名: | Scientific Reports |
巻: | 3 |
論文番号: | 1241 |
抄録: | 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. |
著作権等: | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. |
URI: | http://hdl.handle.net/2433/194142 |
DOI(出版社版): | 10.1038/srep01241 |
PubMed ID: | 23393623 |
出現コレクション: | 学術雑誌掲載論文等 |
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