A virtual optical probe based on localized Surface Plasmon Polaritons
A virtual optical probe based on localized Surface Plasmon Polaritons
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DOI：
10.1364/opex.13.007017
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发表时间：
2005-09-05
期刊：
影响因子：
3.8
通讯作者：
Herzig, HP
中科院分区：
文献类型：
--
作者：
Descrovi, E;Paeder, V;Herzig, HP
提出了一种基于结构金属薄膜表面等离子激元（SPP）激发的受限、倏逝纳米光源。在合适的空腔的帮助下，我们用数值方法证明了在小于衍射极限的空间区域内捕获SPP是可能的。特别是，与零阶腔模式相关的增强等离子体场可以用作扫描近场显微镜系统中的虚拟探针。该器件既具有局域、非辐射源的优点，又具有spp传感器的高灵敏度。横向分辨率受限于虚拟探头的横向延伸。对小物体的模拟扫描结果表明，可以检测到特征尺寸小至50纳米的细节。(c) 2005年美国光学学会。
A confined, evanescent nano-source based on the excitation of Surface Plasmon Polaritons (SPP) on structured thin metal films is proposed. With the help of a suitable cavity, we numerically demonstrate that it is possible to trap SPP over a spatial region smaller than the diffraction limit. In particular, the enhanced plasmonic field associated with the zero-order cavity mode can be used as a virtual probe in scanning near-field microscopy systems. The proposed device shows both the advantages of a localized, non-radiating source and the high sensitivity of SPP-based sensors. The lateral resolution is limited by the lateral extension of the virtual probe. Results from simulated scans of small objects reveal that details with feature sizes down to 50 nm can be detected. (c) 2005 Optical Society of America.