Theory of optical imaging beyond the diffraction limit with a far-field superlens
Theory of optical imaging beyond the diffraction limit with a far-field superlens
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DOI：
10.1117/12.680804
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
S. Durant;Zhaowei Liu;N. Fang;Xiang Zhang
中科院分区：
文献类型：
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作者：
S. Durant;Zhaowei Liu;N. Fang;Xiang Zhang
最近的理论和实验研究表明，成像的分辨率远远超过衍射极限，可以获得所谓的超透镜。然而，由这样的超透镜形成的图像仅在近场中，或者在远离透镜的波长的一部分中。本文提出了一种远场超透镜（FSL）器件，它是由一个具有周期性双折射的平面超透镜构成。我们在理论上表明，当一个对象被放置在这样的FSL的紧密接近，一个独特的图像可以在远场形成。作为一个例子，我们证明了数值的40 nm线与30 nm的间隙，可以从远场数据与适当设计的FSL工作在376 nm波长的图像。
Recent theoretical and experimental studies have shown that imaging with resolution well beyond the diffraction limit can be obtained with so-called superlenses. Images formed by such superlenses are, however, in the near field only, or a fraction of wavelength away from the lens. In this paper, we propose a far-field superlens (FSL) device which is composed of a planar superlens with periodical corrugation. We show in theory that when an object is placed in close proximity of such a FSL, a unique image can be formed in far-field. As an example, we demonstrate numerically that images of 40 nm lines with a 30 nm gap can be obtained from far-field data with properly designed FSL working at 376nm wavelength.