Focusing a beam beyond the diffraction limit using a hyperlens-based device

A super-focusing device composed of a focusing objective and a hyperlens is proposed to focus an incident plane wave into the deep subwavelength dimension. In the device, the objective converts the incident plane wave into a convergent one. The half cylindrical hyperlens can support high wave vector...

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Bibliographic Details
Published in:Chinese physics B 2011-11, Vol.20 (11), p.506-511, Article 117802
Main Author: 郑国兴 张瑞瑛 李松 何平安 周辉
Format: Article
Language:English
Subjects:
Beams (radiation)
Computer simulation
Devices
Diffraction
Focal plane
Focusing
Plane waves
Wave propagation
入射平面波
双曲
对焦
数值孔径
目标转换
聚焦光束
衍射极限
设备组成
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Summary:A super-focusing device composed of a focusing objective and a hyperlens is proposed to focus an incident plane wave into the deep subwavelength dimension. In the device, the objective converts the incident plane wave into a convergent one. The half cylindrical hyperlens can support high wave vector k modes propagating towards its core. So the convergent wave can be focused into an ultrasmall spot beyond the diffraction limit. The layout is proposed for the super-focusing device and its characteristics are investigated theoretically. Numerical simulations verify that the focused beams are confined in a spot with a diameter of 16.3 nm in the focal plane of the focusing objective with a numerical aperture of 0.6, which corresponds to a super-resolution spot of λ0/23 （λ0 is the wavelength in vacuum）. The simulations confirm the effectiveness of the proposed device.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/11/117802