Conformally Mapped Mikaelian Lens for Broadband Achromatic High Resolution Focusing

Jin Chen; Hong Chen Chu; Yun Lai; Zhanwei Liu; Huanyang Chen; Mingji Chen; Daining Fang

doi:10.1002/lpor.202000564

Conformally Mapped Mikaelian Lens for Broadband Achromatic High Resolution Focusing

Jin Chen, Hong Chen Chu, Yun Lai, Zhanwei Liu, Huanyang Chen, Mingji Chen^*, Daining Fang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

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 0.2λ 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.

Original language	English
Article number	2000564
Journal	Laser and Photonics Reviews
Volume	15
Issue number	5
DOIs	https://doi.org/10.1002/lpor.202000564
Publication status	Published - May 2021

Keywords

achromatic high-resolution focusing
all-dielectric metamaterial
conformally mapped Mikalian lens
highly efficient focusing

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10.1002/lpor.202000564

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title = "Conformally Mapped Mikaelian Lens for Broadband Achromatic High Resolution Focusing",

abstract = "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 0.2λ 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.",

keywords = "achromatic high-resolution focusing, all-dielectric metamaterial, conformally mapped Mikalian lens, highly efficient focusing",

author = "Jin Chen and Chu, {Hong Chen} and Yun Lai and Zhanwei Liu and Huanyang Chen and Mingji Chen and Daining Fang",

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doi = "10.1002/lpor.202000564",

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volume = "15",

journal = "Laser and Photonics Reviews",

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T1 - Conformally Mapped Mikaelian Lens for Broadband Achromatic High Resolution Focusing

AU - Chen, Jin

AU - Chu, Hong Chen

AU - Lai, Yun

AU - Liu, Zhanwei

AU - Chen, Huanyang

AU - Chen, Mingji

AU - Fang, Daining

PY - 2021/5

Y1 - 2021/5

N2 - 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 0.2λ 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.

AB - 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 0.2λ 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.

KW - achromatic high-resolution focusing

KW - all-dielectric metamaterial

KW - conformally mapped Mikalian lens

KW - highly efficient focusing

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Conformally Mapped Mikaelian Lens for Broadband Achromatic High Resolution Focusing

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