A silicon superlens with a simple design working at visible wavelengths
A silicon superlens with a simple design working at visible wavelengths
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设计简单、工作于可见波长的硅超级透镜
DOI：
10.1117/12.2228349
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
W. Osten
中科院分区：
文献类型：
--
作者：
K. Frenner;W. Osten
Nano-imaging has imposed a fundamental impact on the development of nanoscience and technology. The demands for direct subwavelength imaging in far field have been significantly increased. Such a superlens needs first to be able to collect the near field information, and then transform it into the far field with magnification and low image distortion. In this contribution we demonstrate a superlens with a novel design for far field observation at visible wavelengths. The lens is based on a silicon half cylinder with several micrometers in size. Without any structuring, the silicon semicylinder can already work as a lens with high resolving power due to its high refractive index. A distance of 280 nm between two incoherent dipoles immersed in water can be well resolved at a wavelength of 640 nm. Deep subwavelength imaging with magnification can be achieved when the flat surface of the semi-cylinder is structured with periodic plasmonic grating. When a ridge of the grating is centered at the optical axis of the lens, a local magnification factor of 10 can be obtained and the smallest resolvable distance between two point dipoles in water is around 120 nm at 640 nm wavelength. Moreover, this superlens also works at other visible wavelengths with a similar performance.
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DOI：
10.1117/12.2185702
发表时间：
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期刊：
影响因子：
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作者：
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DOI：
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