Sub-diffraction-limited optical imaging with a silver superlens
Sub-diffraction-limited optical imaging with a silver superlens
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DOI：
10.1126/science.1108759
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发表时间：
2005-04-22
期刊：
影响因子：
56.9
通讯作者：
Zhang, X
中科院分区：
文献类型：
--
作者：
Fang, N;Lee, H;Zhang, X
最近的理论预测了一种能够产生亚衍射极限图像的超透镜。这种超透镜将允许通过表面等离子体激元的激发来恢复图像中的倏逝波。使用银作为天然光学超透镜，我们展示了具有60纳米半间距分辨率或照明波长的六分之一的亚衍射极限成像。通过适当设计的工作波长和厚度的银，允许访问一个广泛的光谱的亚波长的功能，我们还表明，任意的纳米结构可以成像具有良好的保真度。光学超透镜为纳米级光学成像和超小型光电器件提供了令人兴奋的途径。
Recent theory has predicted a superlens that is capable of producing subdiffraction-limited images. This superlens would allow the recovery of evanescent waves in an image via the excitation of surface plasmons. Using silver as a natural optical superlens, we demonstrated sub-diffraction-limited imaging with 60-nanometer half-pitch resolution, or one-sixth of the illumination wavelength. By proper design of the working wavelength and the thickness of silver that allows access to a broad spectrum of subwavelength features, we also showed that arbitrary nanostructures can be imaged with good fidelity. The optical superlens promises exciting avenues to nanoscale optical imaging and ultrasmall opto-electronic devices.