Far-Field Super-Resolution Imaging of Nano-transparent Objects by Hyperlens with Plasmonic Resonant Cavity

Far-Field Super-Resolution Imaging of Nano-transparent Objects by Hyperlens with Plasmonic Resonant Cavity
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等离激元谐振腔超透镜对纳米透明物体进行远场超分辨率成像

DOI:
10.1007/s11468-015-0081-5
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发表时间:
2016-04
期刊:
影响因子:
3
通讯作者:
Luo, Xiangang
Luo, Xiangang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhang, Wei;Yan, Wei;Wang, Changtao;Luo, Xiangang

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从理论上提出了一种基于等离子共振腔的超透镜,并证明了它可以实现纳米透明物体的远场相位差成像。相衬超分辨成像主要得益于超透镜内部激发的表面等离子体和纳米物体周围的腔结构,这有助于大大增强纳米透明物体产生的倏逝波,并将微弱的相位信息转换为高对比度的光强分布。作为例子,纳米介质物体成像的数值证明了半间距分辨率约λ/10和最小可分辨折射率差低至0.15。
A plasmonic resonant cavity-based hyperlens is theoretically proposed and demonstrated to achieve far-field phase contrast images of nano-transparent objects. The phase contrast super-resolution imaging is mainly contributed to the excited surface plasmons inside hyperlens and cavity structure surrounding nano-objects, which help to greatly enhance evanescent waves generated by nano-transparent objects and convert weak phase information to light intensity distribution with high contrast at the zoomed imaging plane of hyperlens. As examples, nano-dielectric object imaging is numerically demonstrated with half-pitch resolution about λ/10 and a minimum distinguishable refractive index difference down to 0.15.
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