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Exploring the Near-Field of Strongly Coupled Waveguide-Plasmon Modes by Plasmon-Induced Photocurrent Generation Using a Gold Nanograting-Loaded Titanium Dioxide Photoelectrode
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2017-09-22 00:00:00 , DOI: 10.1021/acs.jpcc.7b07707
Jingchun Guo,Kosei Ueno,Jinghuan Yang,Xu Shi,Jie Li,Quan Sun,Tomoya Oshikiri,Hiroaki Misawa

Near-field spectrum measurement techniques, including near-field scanning optical microscopy, electron energy loss spectroscopy, and multiphoton photoemission electron microscopy, are powerful means to investigate near-field interactions directly on closely spaced metallic nanoparticles or a metallic nanostructure coupled with optical modes, such as whispering gallery mode and waveguide mode, which are called coupled plasmonic systems. In the present study, we have successfully measured the near-field spectra of coupled plasmonic systems using a simple photoelectrochemical measurement based on plasmon-induced water oxidation. Coupling was explored between the localized surface plasmon resonance (LSPR) mode and waveguide mode of periodic gold nanogratings patterned on a thin titanium dioxide waveguide film. It is known that the far-field reflection spectrum of this waveguide-LSPR coupling system shows a complicated shape with multiple peaks, and the coupling has been explored by numerical electromagnetic simulations so far. However, in this study, it was clearly elucidated that an internal quantum efficiency (IQE) spectrum observed in the plasmon-induced photocurrent generation has successfully reproduced the near-field spectrum predicted by electromagnetic simulations under the coupling conditions. The photocurrent generation based on the plasmon-induced charge separation is due to the near-field effect, and it can be considered that the IQE spectrum corresponds to the near-field spectrum. This study paves a new way to indirectly measure the near-field spectrum of plasmonic systems.

中文翻译:

用金纳米光栅负载的二氧化钛光电极通过等离子体诱导的光电流产生探索强耦合波导-等离子体模式的近场。

近场光谱测量技术,包括近场扫描光学显微镜,电子能量损失光谱和多光子光发射电子显微镜,是直接研究紧密间隔的金属纳米粒子或金属纳米结构与光学模式耦合的近场相互作用的有力手段,例如回音壁模式和波导模式,它们被称为耦合等离子体系统。在本研究中,我们已经使用基于等离激元诱导的水氧化的简单光电化学测量成功地测量了耦合等离激元系统的近场光谱。探索耦合的局部表面等离子体共振(LSPR)模式和周期性金纳米光栅在薄的二氧化钛波导膜上构图的波导模式之间。众所周知,该波导-LSPR耦合系统的远场反射光谱显示出具有多个峰的复杂形状,并且到目前为止,已经通过数值电磁模拟来探索该耦合。然而,在这项研究中,已明确阐明在等离激元诱导的光电流产生中观察到的内部量子效率(IQE)光谱已成功地再现了在耦合条件下通过电磁模拟预测的近场光谱。基于等离子体激元诱导的电荷分离的光电流产生是由于近场效应引起的,并且可以认为IQE谱对应于近场谱。这项研究为间接测量等离激元系统的近场光谱铺平了道路。
更新日期:2017-09-22
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