Plasmonically Controlled Lasing Resonance with Metallic-Dielectric Core-Shell Nanoparticles
Plasmonically Controlled Lasing Resonance with Metallic-Dielectric Core-Shell Nanoparticles
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DOI：
10.1021/nl200030h
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发表时间：
2011-03-01
期刊：
影响因子：
10.8
通讯作者：
Tanaka, Katsuhisa
中科院分区：
文献类型：
--
作者：
Meng, Xiangeng;Fujita, Koji;Tanaka, Katsuhisa
我们的实验表明，通过操纵表面等离子体激元和光子之间的耦合随机激光介质组成的金属-介电核-壳纳米粒子和有机染料的激光共振特性的剪裁能力。结果表明，核-壳纳米粒子为基础的系统表现出不同于那些含有纯金属纳米粒子的光反馈功能，只要散射强度是足够弱。泵浦阈值随壳层厚度的增加而增加，这直接证明了局域场增强在相干反馈的出现中起着重要作用。从金属表面附近荧光团荧光性质的改变出发，讨论了阈值和光反馈中的反常行为。
We experimentally demonstrate the capability of tailoring lasing resonance properties by manipulating the coupling between surface plasmons and photons in random lasing media composed of metallic-dielectric core-shell nanoparticles and organic dyes. It is revealed that core-shell nanoparticle-based systems exhibit optical feedback features distinctive from those containing pure metallic nanoparticles, provided that the scattering strength is weak enough. The pump threshold increases with an increment in the shell thickness, which can provide a direct proof that the local field enhancement plays a central role in the emergence of coherent feedback. The anomalous behavior in both threshold and optical feedback is discussed in terms of the modification of fluorescent properties of fluorophores close to metallic surface.