银纳米环的等离子体激发和光致发光增强
Plasmon mode excitation and photoluminescence enhancement on silver nanoring
摘要：
我们展示了一种简单而高性能的激光辅助银纳米环制造技术，其中包括通过聚焦纳秒脉冲和随后的反应离子抛光来烧蚀Ag膜。纳米环的直径和厚度可以通过在激光烧蚀步骤中优化脉冲能量和金属膜厚度来控制，而随后的反应离子抛光提供了制造具有期望高度的纳米环的能力。s偏振准直激光束倾斜照射纳米环的散射图案表明纳米环内的焦点从其中心偏移约0.57Rring的距离。证明了在Ag纳米环附近的罗丹明6G有机染料的光致发光信号的五倍增强。这种增强归因于纳米环表面附近的电磁场振幅的增加，所述电磁场振幅是由沿着纳米环行进的多极等离子体激元模式的激发引起的。这一假设证实了暗场背散射光谱的纳米环下测量白光照明，以及通过支持有限差分时域模拟。
英文摘要：
We demonstrate a simple and high-performance laser-assisted technique for silver nanoring fabrication, which includes the ablation of the Ag film by focused nanosecond pulses and subsequent reactive ion polishing. The nanoring diameter and thickness can be controlled by optimizing both the pulse energy and the metal film thickness at laser ablation step, while the subsequent reactive ion polishing provides the ability to fabricate the nanoring with desirable height. Scattering patterns of s-polarized collimated laser beam obliquely illuminating the nanoring demonstrate the focal spot inside the nanoring shifted from its center at a distance of ~ 0.57Rring. Five-fold enhancement of the photoluminescence signal from the Rhodamine 6G organic dye near the Ag nanoring was demonstrated. This enhancement was attributed to the increase of the electromagnetic field amplitude near the nanoring surface arising from excitation of the multipole plasmon modes traveling along the nanoring. This assumption was confirmed by dark-field back-scattering spectrum of the nanoring measured under white-light illumination, as well as by supporting finite-difference time-domain simulations.
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