Grating enhanced apertureless near-field optical microscopy.
Grating enhanced apertureless near-field optical microscopy.
复制标题
DOI：
10.1364/oe.23.018401
复制
发表时间：
2015-07
期刊：
影响因子：
3.8
通讯作者：
J. Mihaljević;C. Hafner;A. Meixner
中科院分区：
文献类型：
--
作者：
J. Mihaljević;C. Hafner;A. Meixner
我们研究的可能性，优化发射和近场信号的无孔银和金尖通过使用一个优化的非周期性光栅。在这种情况下，我们认为一个单一的量子发射器的发射接近优化的提示。此外，我们还研究了紧聚焦光束与针尖近场的远场耦合效率。性能的增益进行了比较，与非结构化的提示和比较与纯等离子体激元激发的非结构化的提示进行了讨论。优化的，结构化的提示显示出显着增强的总衰减率，作为一个结果，在光栅和尖端顶点之间的驻波等离子体激元波，导致共振行为。共振现象可以用Fabry-Pérot模型很好地解释。此外，当光栅从最佳谐振位置偏移时，与非结构化尖端相比，结构化尖端附近的发射器的总衰减率也可以降低。所提出的方案代表了一种有趣的新型纳米天线，其谐振以及方向性可以由光栅控制。
We examine the possibility of optimizing the emission and the near-field signal of apertureless silver and gold tips by using an optimized non-periodic grating. In this context, we consider the emission of a single quantum emitter in close proximity to optimized tips. Additionally, we study the far-field coupling efficiency of a tightly focused beam to the near-field of the tip. The gain in performance is compared with unstructured tips and the comparison with a pure plasmonic excitation of an unstructured tip is discussed. The optimized, structured tips show a significant enhancement of the total decay rate, as a result of standing plasmonic waves between the grating and the tip apex, leading to a resonant behavior. The resonances can be explained well with a Fabry-Pérot model. Furthermore, the total decay rate of an emitter near a structured tip can also be decreased as compared to an unstructured tip, when the grating is shifted from the optimal resonant position. The proposed scheme represents an interesting novel nano-antenna, for which the resonance as well as the directivity can be controlled by the grating.