Loop-Turn Optical Flows with Spectral Selectivity in Suspended Plasmonic Nanofin-Cavity Structure
Loop-Turn Optical Flows with Spectral Selectivity in Suspended Plasmonic Nanofin-Cavity Structure
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DOI：
10.1021/acsphotonics.5b00083
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发表时间：
2015-05
期刊：
影响因子：
7
通讯作者：
Y. Ho;M. Abasaki;J. Delaunay
中科院分区：
文献类型：
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作者：
Y. Ho;M. Abasaki;J. Delaunay
金属纳米结构支持表面等离子体，这些等离子体将入射光强烈耦合到金属表面。作为一种可能的光操纵手段，它们已经受到了大量的关注。在各种已报道的结构中，由于腔模式具有窄带、大调制和在宽波长范围内可调谐的特点，因此在光谱应用中具有很大的前景，这为改善远场测量中的共振提供了一种手段。本报告描述了一种悬浮等离子体纳米鳍腔结构，该结构能够在红外（IR）区域产生具有高质量因子(Q)的可调谐反射共振。脊上具有等离子体热点的纳米鳍-腔结构在水平和垂直方向上支持具有增强电场的驻波共振；因此产生了强光流，光在一个环路中转动，导致高反射率。当纳米光纤腔进一步耦合到传播的表面等离子体共振时…
Metallic nanostructures sustain surface plasmons that strongly couple incident light to the surface of the metal. They have received a great amount of attention as a possible means of light manipulation. Among the various reported structures, cavities are promising for spectroscopic applications because the cavity mode, with its narrow band, large modulation, and tunability over a wide range of wavelengths, provides a means to improve the resonances in far-field measurements. This report describes a suspended plasmonic nanofin-cavity structure capable of producing tunable reflected resonances with high quality factors (Q) in the infrared (IR) region. The nanofin-cavity structure having plasmonic hot spots on the ridges supports standing-wave resonances with enhanced electric fields in the horizontal and vertical directions; strong optical flows are thus generated and light turns in a loop, resulting in high reflectance. When the nanofin cavity is further coupled to the propagating surface plasmon resonanc...