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Conformally Mapped Mikaelian Lens for Broadband Achromatic High Resolution Focusing
Author(s) -
Chen Jin,
Chu Hong Chen,
Lai Yun,
Liu Zhanwei,
Chen Huanyang,
Chen Mingji,
Fang Daining
Publication year - 2021
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.202000564
Subject(s) - achromatic lens , optics , lens (geology) , refractive index , broadband , gradient index optics , physics , isotropy , resolution (logic) , full width at half maximum , photolithography , wavefront , focal length , computer science , artificial intelligence
Focusing light into a tiny spot of high resolution is of significant importance in fields from imaging, photolithography to microwave engineering and sensing. However, most of the previous high resolution metalenses are constrained by their limited bandwidth and efficiency. In this paper, on the basis of Mikaelian lens derived from conformal transformation optics, a rectangular gradient refractive index lens with a relatively larger refractive index profile is put forward and manufactured by gradient isotropic dielectrics. Highly efficient (above 74%) broadband (7–14 GHz) achromatic high resolution focusing with full width at half maximum (FWHM) around 0.2 λ as well as large numerical aperture (NA) of 2.04 has been accomplished. Measured results agree well with theoretical predictions, which makes the presented lens having a great potential to be employed in high resolution imaging systems.