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Applied Physics 2024
杂化模式二聚体结构光电子发射研究
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Abstract:
基于金属纳米结构中的等离激元效应可以将周围电场局域在纳米级空间尺度范围中，并且有着出色的电场增强的能力，在增强光传导效应、提高超快电子源亮度、提升太阳能电池转化效率等方面都有着出色的潜力。本文使用非对称金纳米二聚体结构进行模拟，对等离激元杂化模式对光电子发射进行研究，发现金纳米短棒占据二聚体结构场增强的主导，当二聚体结构呈成键模式，短棒的Ez分量要强于长棒，反键模式中长棒的Ez分量要超过短棒，并将金纳米二聚体结构的间隙增加至200 nm时，在双棒的耦合作用足够小的情况下，分别对二者的近场进行研究，发现金纳米长棒中的Ez/E约是短棒的4倍左右，金纳米长棒的光电子产额是短棒的十倍左右。
Based on the plasmon effect in metal nanostructures, the surrounding electric field can be localized within the nanometer-scale spatial range, with excellent field enhancement capabilities. This has great potential in enhancing light conduction effects, improving the brightness of ultrafast electron sources, and increasing the efficiency of solar cell conversion. In this study, asymmetric gold nanorod dimer structures were simulated to investigate the plasmon hybrid mode on photoelectron emission. It was found that the gold nanorod played a dominant role in the field enhancement of the dimer structure, with the short rod having a stronger Ez component than the long rod in the bonding mode, while in the anti-bonding mode, the Ez component of the long rod exceeded that of the short rod. When the gap between the gold nanorod dimer structures was increased to 200 nm, and the coupling effect between the two rods was sufficiently small, the near-field of each rod was studied. It was observed that the Ez/E ratio in the gold nanorod long rod was about four times that of the short rod, and the photoelectron yield of the gold nanorod long rod was approximately ten times that of the short rods.
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