A nano-confined source based on surface plasmon Bragg reflectors and nanocavity.
A nano-confined source based on surface plasmon Bragg reflectors and nanocavity.
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DOI：
10.1364/oe.16.019882
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发表时间：
2008-11
期刊：
影响因子：
3.8
通讯作者：
Qingyan Wang;Jia Wang;Shulian Zhang
中科院分区：
文献类型：
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作者：
Qingyan Wang;Jia Wang;Shulian Zhang
实现了一种基于SPP布拉格反射镜和纳米腔的纳米约束光源。由环形凹槽包围的纳米腔组成的结构用于获得单个、局部化且非辐射的中心峰，其可用作纳米源。通过扫描近场光学显微镜（SNOM）表征了具有不同结构参数的样品附近的SPP场，证明了结构增强峰值强度和抑制旁瓣的能力。在离样品表面600 nm的距离内，中心峰的半高宽小于285 nm（0.45 λ），结构参数的改变使中心峰强度增强了至少1.27倍，旁瓣抑制不超过中心峰强度的73%。基于FDTD方法的数值模拟结果与实验结果吻合较好，并为理解这些现象背后的物理机制提供了一些线索。这种基于表面等离子体的纳米光源在近场成像、数据存储、光学操纵和局域光谱探测等方面具有广阔的应用前景。
A type of nano-confined light source based on SPP Bragg reflectors and a nanocavity has been realized. The structures consisting of a nanocavity surrounded by annular grooves are used to obtain a single, localized and non-radiating central peak, which can be used as a nano source. Characterization of the SPP field in the vicinity of the samples with different structural parameters is accomplished by the scanning near-field optical microscope (SNOM), demonstrating the ability of the structures to enhance the peak intensity and to suppress the sidelobes. During 600 nm distance away from the sample surface, the FWHM of the central peak is below 285 nm (0.45 lambda), and the modifications of the structural parameters result in at least 1.27 times enhancement of the central peak intensity together with the sidelobe suppression of no more than 73% of the central peak intensity. Numerical simulations based on FDTD method show a good agreement with the experimental results, and give some clues to understand the physical mechanisms behind these phenomena. This type of SPP-based nano source is promising to be applied in near-field imaging, data storage, optical manipulation and localized spectrum detection.