In Situ Visualization of Localized Surface Plasmon Resonance‐Driven Hot Hole Flux,Advanced Science

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In Situ Visualization of Localized Surface Plasmon Resonance‐Driven Hot Hole Flux
Advanced Science ( IF 14.3 ) Pub Date : 2020-08-06 , DOI: 10.1002/advs.202001148
Hyunhwa Lee _{1,

2} , Kyoungjae Song _{1,

2} , Moonsang Lee ₃ , Jeong Young Park _{1,

2}

Affiliation

Nonradiative surface plasmon decay produces highly energetic electron–hole pairs with desirable characteristics, but the measurement and harvesting of nonequilibrium hot holes remain challenging due to ultrashort lifetime and diffusion length. Here, the direct observation of LSPR‐driven hot holes created in a Au nanoprism/p‐GaN platform using photoconductive atomic force microscopy (pc‐AFM) is demonstrated. Significant enhancement of photocurrent in the plasmonic platforms under light irradiation is revealed, providing direct evidence of plasmonic hot hole generation. Experimental and numerical analysis verify that a confined |E|‐field surrounding a single Au nanoprism spurs resonant coupling between localized surface plasmon resonance (LSPR) and surface charges, thus boosting hot hole generation. Furthermore, geometrical and size dependence on the extraction of LSPR‐driven hot holes suggests an optimized pathway for their efficient utilization. The direct visualization of hot hole flow at the nanoscale provides significant opportunities for harnessing the underlying nature and potential of plasmonic hot holes.

中文翻译：

局域表面等离子共振驱动的热空穴通量的原位可视化

非辐射表面等离子体衰变产生具有理想特性的高能电子空穴对，但由于超短寿命和扩散长度，非平衡热空穴的测量和收集仍然具有挑战性。在这里，展示了使用光电导原子力显微镜（pc-AFM）直接观察在金纳米棱镜/p-GaN 平台中产生的局域表面等离子体共振驱动的热空穴。揭示了光照射下等离子体平台中光电流的显着增强，为等离子体热空穴的产生提供了直接证据。实验和数值分析验证了受限|单个金纳米棱柱周围的电场激发局域表面等离子体共振（LSPR）和表面电荷之间的共振耦合，从而促进热空穴的产生。此外，局域表面等离子体共振驱动的热空穴提取的几何和尺寸依赖性表明了其有效利用的优化途径。纳米尺度热空穴流的直接可视化为利用等离子体热空穴的潜在性质和潜力提供了重要的机会。

更新日期：2020-08-06

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