Study of Nonlinear Plasmonic Scattering in Metallic Nanoparticles
Study of Nonlinear Plasmonic Scattering in Metallic Nanoparticles
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DOI：
10.1021/acsphotonics.6b00025
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发表时间：
2016-08-01
期刊：
影响因子：
7
通讯作者：
Chu, Shi-Wei
中科院分区：
文献类型：
--
作者：
Chen, Yu-Ting;Lee, Po-Hsuan;Chu, Shi-Wei
非线性光学效应在通信、传感、成像等领域起着至关重要的作用。最近，在金纳米球中发现了非线性散射(饱和和反饱和)，为非漂白超分辨显微镜提供了一种新的方法。然而，以前的非线性仅限于绿-橙色等离子体带。扩展适用的波长范围是非常必要的。在这项工作中，我们展示了金纳米棒的近红外和银纳米球的蓝紫光的非线性散射。此外，还从不同的材料/几何角度阐明了其非线性机理。通过对等离子体吸收/散射和带间/带内跃迁的贡献进行光谱去耦合，我们证实了等离子体吸收和随后的热效应是非线性的主要来源。我们的工作不仅提供了非线性散射的物理机制，而且为基于等离子体散射的多色超分辨成像铺平了道路。
Nonlinear optical effects play key roles to communication, sensing, imaging, and so on. Recently, nonlinear scattering (saturation and reverse saturation) was discovered in gold nanospheres, providing a novel approach to nonbleaching super-resolution microscopy. However, the nonlinearity was previously limited to green-orange plasmonic band. It is highly desirable to extend the applicable wavelength range. In this work, we demonstrated nonlinear scattering in near-infrared with gold nanorods and in blue-violet with silver nanospheres. Besides, the nonlinear mechanism is clarified via different material/geometry. By spectrally decoupling the contributions of plasmonic absorption/scattering and interband/intraband transitions, we have verified plasmonic absorption, and the subsequent thermal effects to be the dominating source of nonlinearity. Our work not only provides the physical mechanism of the nonlinear scattering, but also paves the way toward multicolor super-resolution imaging based on plasmonic scattering.