How Dark Are Radial Breathing Modes in Plasmonic Nanodisks?,ACS Photonics

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How Dark Are Radial Breathing Modes in Plasmonic Nanodisks?
ACS Photonics ( IF 6.5 ) Pub Date : 2017-12-12 00:00:00 , DOI: 10.1021/acsphotonics.7b01060
Franz-Philipp Schmidt _{1,

2} , Arthur Losquin _{3,

4} , Ferdinand Hofer ₂ , Andreas Hohenau ₁ , Joachim R. Krenn ₁ , Mathieu Kociak ₅

Affiliation

Due to a vanishing dipole moment, radial breathing modes in small flat plasmonic nanoparticles do not couple to light and have to be probed with a near-field source, as in electron energy loss spectroscopy (EELS). With increasing particle size, retardation gives rise to light coupling, enabling probing breathing modes optically or by cathodoluminescence (CL). Here, we investigate single silver nanodisks with diameters of 150–500 nm by EELS and CL in an electron microscope and quantify the EELS/CL ratio, which corresponds to the ratio of full to radiative damping of the breathing mode. For the investigated diameter range, we find the CL signal to increase by about 1 order of magnitude, in agreement with numerical simulations. Due to reciprocity, our findings corroborate former optical experiments and enable a quantitative understanding of the light coupling of dark plasmonic modes.

中文翻译：

等离子纳米盘中的径向呼吸模式有多暗？

由于偶极矩消失，小的平面等离激元纳米颗粒中的径向呼吸模式不会与光耦合，因此必须像电子能量损失谱（EELS）一样使用近场源进行探测。随着粒径的增加，延迟会引起光耦合，从而可以通过光学方式或通过阴极发光（CL）探测呼吸模式。在这里，我们通过电子显微镜通过EELS和CL研究直径为150-500 nm的单个银纳米盘，并量化EELS / CL比率，该比率对应于呼吸模式的全衰减与辐射衰减之比。对于研究的直径范围，我们发现CL信号增加了约1个数量级，这与数值模拟相符。由于互惠，

更新日期：2017-12-12

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