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Optimization‐free superoscillatory lens using phase and amplitude masks
Author(s) -
Huang Kun,
Ye Huapeng,
Teng Jinghua,
Yeo Swee Ping,
Luk'yanchuk Boris,
Qiu ChengWei
Publication year - 2014
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201300123
Subject(s) - lens (geology) , optics , interference (communication) , amplitude , physics , phase (matter) , fresnel zone , near and far field , fresnel lens , computer science , telecommunications , diffraction , quantum mechanics , channel (broadcasting)
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 15 λ 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.