Sub-diffraction phase-contrast imaging of transparent nano-objects by plasmonic lens structure
Sub-diffraction phase-contrast imaging of transparent nano-objects by plasmonic lens structure
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DOI：
10.1088/0957-4484/24/13/135203
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发表时间：
2013-04
期刊：
影响因子：
3.5
通讯作者：
Na Yao;Changtao Wang;Xing Tao;Yanqin Wang;Zeyu Zhao;Xiangang Luo
中科院分区：
文献类型：
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作者：
Na Yao;Changtao Wang;Xing Tao;Yanqin Wang;Zeyu Zhao;Xiangang Luo
我们提出一种特殊设计的等离子体透镜结构，成功地实现了透明纳米物体的亚衍射相衬成像。纳米物体嵌入金属-绝缘体-金属（MIM）等离子体激元结构的绝缘体层内部，并且相对于透明绝缘体层具有小的折射率差。MIM结构中激发的表面等离子体激元有助于极大地增强来自纳米物体的散射光，并有效地抑制透射照明光。的空间分辨率约为64 nm和最小可分辨的折射率差下降到0.05的数值证明。对于不规则三维（3D）纳米线和纳米柱的亚衍射相衬成像，优化的MIM结构显示出比超透镜更好的性能。
We propose a specially designed plasmonic lens structure to succeed in realizing sub-diffraction phase-contrast imaging of transparent nano-objects. The nano-objects are embedded inside the insulator layer of the metal–insulator–metal (MIM) plasmonic structure and have a small refractive index difference with respect to the transparent insulator layer. The excited surface plasmons in the MIM structure help to greatly enhance scattered light from the nano-objects and effectively suppress the transmitted illumination light. A spatial resolution of about 64 nm and a minimum distinguishable refractive index difference down to 0.05 are numerically demonstrated. For sub-diffraction phase-contrast imaging of irregular three-dimensional (3D) nanowires and nanocylinders, the optimized MIM structure shows much better performance in comparison with that of a superlens.