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Focusing a beam beyond the diffraction limit using a hyperlens-based device |
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| Authors: | Zheng Guo-Xing Zhang Rui-Ying Li Song He Ping-An and Zhou Hui |
| Affiliation: | School of Electronic Information, Wuhan University, Wuhan 430079, China;School of Electronic Information, Wuhan University, Wuhan 430079, China;School of Electronic Information, Wuhan University, Wuhan 430079, China;School of Electronic Information, Wuhan University, Wuhan 430079, China;School of Electronic Information, Wuhan University, Wuhan 430079, China |
| 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 λ0/23 (λ0 is the wavelength in vacuum). The simulations confirm the effectiveness of the proposed device. |
| Keywords: | hyperlens objective super-focusing device resolution |
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