Zero-refraction in natural materials and the mechanism of metal superlens
Yun-Song Zhou (1), Huai-Yu Wang (2), Hai Wang (1) ((1) Center of, Theoretical Physics, Department of Physics, Capital Normal University., Beijing, China (2), Department of Physics, Tsinghua University, Beijing,, China)
TL;DR
This paper reveals that single negative materials exhibit zero-refraction in near fields and explains the distinct mechanism of metal superlenses in surpassing diffraction limits, supported by numerical and experimental results.
Contribution
It uncovers the zero-refraction property of single negative materials and clarifies the mechanism of metal superlenses, differing from perfect lenses made of double negative materials.
Findings
Zero-refraction in single negative materials confirmed
Numerical results align with experimental data
New understanding of metal superlens mechanism
Abstract
We found that a single negative material has a character of zero-refraction in near field, and point out that the mechanism of a metal superlens to image with the resolution exceeding the diffraction limitation is different from that of a perfect lens made of a double negative material. The principle of metal superlens is disclosed. Our numerical results based on the zero-refraction character coincide with the experimental results well. This work brings new understanding about the single negative materials and will lead the applications of metal superlens in right way.
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