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Title: Optimization-free superoscillatory lens using phase and amplitude masks
Authors: Huang, K.
Ye, H.
Teng, J.
Yeo, S.P. 
Luk'yanchuk, B.
Qiu, C.-W. 
Keywords: Binary phase mask
Fresnel zone plate
Subwavelength imaging
Issue Date: Jan-2014
Citation: Huang, K., Ye, H., Teng, J., Yeo, S.P., Luk'yanchuk, B., Qiu, C.-W. (2014-01). Optimization-free superoscillatory lens using phase and amplitude masks. Laser and Photonics Reviews 8 (1) : 152-157. ScholarBank@NUS Repository.
Abstract: A superoscillatory focusing lens has been experimentally demonstrated by optimizing Fresnel zone plates (FZP), with limited physical insight as to how the lens feature contributes to the focal formation. It is therefore imperative to establish a generalized viable account for both FZP (amplitude mask) and binary optics (phase mask). Arbitrary superoscillatory spots can now be customized and realized by a realistic optical device, without using optimization. It is counterintuitively found that high spatial frequency with small amplitude and destructive interference are favorable in superfocusing of a superoscillation pattern. The inevitably high sidelobe is pushed 15λ away from the central subwavelength spot, resulting in significantly enlarged field of view for viable imaging applications. This work therefore not only reveals the explicit physical role of any given metallic/dielectric rings but also provides an alternative design roadmap of superresolution imaging. The robust method is readily applicable in superthin longitudinally polarized needle light, quantum physics and information theory. © 2013 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Laser and Photonics Reviews
ISSN: 18638880
DOI: 10.1002/lpor.201300123
Appears in Collections:Staff Publications

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