Extreme sensitivity of plasmon drag to surface modification
Extreme sensitivity of plasmon drag to surface modification
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DOI：
10.1088/1361-6463/abba93
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
T. Ronurpraful;N. Jerop;A. Koech;K. Thompson;N. Noginova
中科院分区：
文献类型：
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作者：
T. Ronurpraful;N. Jerop;A. Koech;K. Thompson;N. Noginova
等离子体结构中光电流的巨大增强（等离子体拖曳效应）为等离子体效应的紧凑电监测提供了机会，并且因此对于基于等离子体的感测应用是有希望的。在实验中，我们测量光致电信号在平面和轮廓调制系统，并测试其灵敏度的局部介电环境的微小变化，如在金属表面存在的朗缪尔-布洛杰特单层。我们表明，添加硬脂酸单层导致等离子体共振条件的小位移，最终可以解决与电气测量的光电压极性的切换。
Giant enhancement of photocurrents in plasmonic structures (plasmon drag effect) provides opportunities for compact electric monitoring of plasmonic effects, and thus is promising for plasmonic-based sensing applications. In the experiment, we measure photoinduced electric signals in flat and profile-modulated systems, and test their sensitivity to small changes of the local dielectric environment, such as a presence of Langmuir–Blodgett monolayers at the metal surface. We show that the addition of a stearic acid monolayer leading to a small shift in plasmon resonance conditions can be ultimately resolved with electrical measurements as the switching in the photovoltage polarity.