Low-threshold plasmonic lasing based on high-Q dipole void mode in a metallic nanoshell.
Low-threshold plasmonic lasing based on high-Q dipole void mode in a metallic nanoshell.
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DOI：
10.1364/ol.37.001181
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发表时间：
2012-04
期刊：
影响因子：
3.6
通讯作者：
Jun Pan;Zhaozhong Chen;Jing Chen;Peng Zhan;Chaojun Tang;Zhenlin Wang
中科院分区：
文献类型：
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作者：
Jun Pan;Zhaozhong Chen;Jing Chen;Peng Zhan;Chaojun Tang;Zhenlin Wang
我们提出了一种新型的等离子体激元激光纳米结构，包括一个金属外壳和一个增益核心。我们数值证明，这种金属介电核壳纳米粒子的高度本地化的空隙模式具有非常高的品质因数。我们发现，偶极空穴模在800 nm处具有低至128 cm（-1）的激光阈值，这是由于空穴中心周围的最大场增强导致的壳内独特的模式分布的结果。研究了银还原的银纳米杯的激光条件，发现只要纳米杯的开口角小于10°，就能维持较低的等离子体激元激光阈值。我们的建议提出了一个新的路径等离子体激光器具有低增益阈值。
We propose a novel type of plasmonic lasing nanostructure consisting of a metallic shell and a gain core. We demonstrate numerically that highly localized void modes of such metallodielectric core-shell nanoparticles have a very high quality factor. We found that the dipole void mode has a lasing threshold as low as 128 cm(-1) at 800 nm as a result of the unique mode distribution within the shell, due to a maximum field enhancement around the void center. The lasing condition for a symmetry-reduced silver nanocup is also investigated and the low plasmonic lasing threshold is sustained provided that the opening angle of the nanocup is smaller than 10°. Our proposal presents a new path toward plasmonic lasers with low gain threshold.