Silicon Nanowire on Mirror Nanoantennas: Engineering Hybrid Gap Mode for Light Sources and Sensing Platforms
Silicon Nanowire on Mirror Nanoantennas: Engineering Hybrid Gap Mode for Light Sources and Sensing Platforms
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DOI：
10.1021/acsanm.0c01559
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
H. Sugimoto;R. Imaizumi;Tatsuki Hinamoto;T. Kawashima;M. Fujii
中科院分区：
文献类型：
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作者：
H. Sugimoto;R. Imaizumi;Tatsuki Hinamoto;T. Kawashima;M. Fujii
最近的研究表明，由于Mie型共振的激发，高折射率介质材料的纳米线(NW)可以作为纳米天线使用。在这里，我们通过将硅(Si)NW与外部金属组件相结合来探索它作为光学纳米天线的能力。我们研究了单个SiNW通过很薄的介质隔离层放置在金(Au)镜上的光散射特性，并证明了由于谐振模与Au镜的耦合，禁带内的电磁场受到了很强的限制。我们证明了混合模式的共振波长可以通过带隙长度来调节，并且混合带隙模式强烈地改变了包含在带隙中的量子点(QD)单分子膜发射的光谱形状。结合数值模拟，对实验数据进行了定量分析，结果表明，这种耦合对量子点发射的增强和偏振控制都是通过耦合实现的。
It has been demonstrated recently that a nanowire (NW) of high refractive index dielectric materials works as a nanoantenna because of the excitation of the Mie-type resonances. Here, we explore the capability of a silicon (Si) NW as an optical nanoantenna by combining it with an external metallic component. We investigate the light scattering property of a single Si NW placed on a gold (Au) mirror via a very thin dielectric spacer and demonstrate strong confinement of electromagnetic fields in the gap because of the coupling of the resonance modes with a Au mirror. We demonstrate that the resonance wavelength of the hybrid mode can be tuned by the gap length, and the hybrid gap mode strongly modifies the spectral shape of the emission from a quantum dot (QD) monolayer incorporated in the gap. Quantitative analyses of the data in combination with numerical simulations reveal that the enhancement and the polarization control of the QD emission are achieved by the coupling.