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

doi:10.1088/1674-1056/20/11/117802

中国物理B ›› 2011, Vol. 20 ›› Issue (11): 117802-117802.doi: 10.1088/1674-1056/20/11/117802

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

郑国兴, 张瑞瑛, 李松, 何平安, 周辉

School of Electronic Information, Wuhan University, Wuhan 430079, China

收稿日期:2011-04-14 修回日期:2011-06-23 出版日期:2011-11-15 发布日期:2011-11-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10904118), the Natural Science Foundation of Hubei Province, China (Grant No. 2009CDB211), and the Fundamental Research Funds for the Central Universities of China.

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

Zheng Guo-Xing(郑国兴)^†, Zhang Rui-Ying(张瑞瑛), Li Song(李松), He Ping-An(何平安), and Zhou Hui(周辉)

School of Electronic Information, Wuhan University, Wuhan 430079, China

Received:2011-04-14 Revised:2011-06-23 Online:2011-11-15 Published:2011-11-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10904118), the Natural Science Foundation of Hubei Province, China (Grant No. 2009CDB211), and the Fundamental Research Funds for the Central Universities of China.

摘要/Abstract

摘要： 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.

关键词: hyperlens, objective, super-focusing device, resolution

Abstract: 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 $\lambda_0$/23 ($\lambda_0$ is the wavelength in vacuum). The simulations confirm the effectiveness of the proposed device.

Key words: hyperlens, objective, super-focusing device, resolution

中图分类号: (Multilayers; superlattices; photonic structures; metamaterials)

78.67.Pt

42.79.Bh (Lenses, prisms and mirrors) 42.25.Bs (Wave propagation, transmission and absorption)

郑国兴, 张瑞瑛, 李松, 何平安, 周辉. Focusing a beam beyond the diffraction limit using a hyperlens-based device[J]. 中国物理B, 2011, 20(11): 117802-117802.

Zheng Guo-Xing(郑国兴), Zhang Rui-Ying(张瑞瑛), Li Song(李松), He Ping-An(何平安), and Zhou Hui(周辉) . Focusing a beam beyond the diffraction limit using a hyperlens-based device[J]. Chin. Phys. B, 2011, 20(11): 117802-117802.

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

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

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