Controlling the interaction of polarization light with an asymmetric nanostructure such as a metal/semiconductor heterostructure provides opportunities for tuning surface plasmon excitation and near‐field spatial distribution. However, light polarization effects on interfacial charge transport and the photocatalysis of plasmonic metal/semiconductor photocatalysts are unclear. Herein, we reveal the polarization dependence of plasmonic charge separation and spatial distribution in Au/TiO₂ nanoparticles under 45° incident light illumination at the single‐particle level using a combination of photon‐irradiated Kelvin probe force microscopy (KPFM) and electromagnetic field simulation. We quantitatively uncover the relationship between the local charge density and polarization angle by investigating the polarization‐dependent surface photovoltage (SPV). The plasmon‐induced photocatalytic activity is enhanced when the polarization direction is perpendicular to the Au/TiO₂ interface.

中文翻译：

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表面等离子体诱导的Au / TiO2纳米粒子光催化的极化效应。

控制偏振光与非对称纳米结构（例如金属/半导体异质结构）的相互作用为调整表面等离子体激元激发和近场空间分布提供了机会。但是，光偏振对界面电荷传输和等离激元金属/半导体光催化剂的光催化作用尚不清楚。在这里，我们揭示了Au / TiO ₂中等离子体电荷分离的极化依赖性和空间分布结合使用光子辐照的开尔文探针力显微镜（KPFM）和电磁场模拟，在45°入射光照射下以单粒子水平照射纳米粒子。通过研究偏振相关的表面光电压（SPV），我们定量地揭示了局部电荷密度与偏振角之间的关系。当极化方向垂直于Au / TiO ₂界面时，等离子体激元诱导的光催化活性增强。