Achromatic super-oscillatory lenses with sub-wavelength focusing

Light, Science & Applications
Guang Hui YuanNikolay I Zheludev

Abstract

Lenses are crucial to light-enabled technologies. Conventional lenses have been perfected to achieve near-diffraction-limited resolution and minimal chromatic aberrations. However, such lenses are bulky and cannot focus light into a hotspot smaller than a half-wavelength of light. Pupil filters, initially suggested by Toraldo di Francia, can overcome the resolution constraints of conventional lenses but are not intrinsically chromatically corrected. Here we report single-element planar lenses that not only deliver sub-wavelength focusing, thus beating the diffraction limit of conventional refractive lenses, but also focus light of different colors into the same hotspot. Using the principle of super-oscillations, we designed and fabricated a range of binary dielectric and metallic lenses for visible and infrared parts of the spectrum that are manufactured on silicon wafers, silica substrates and optical fiber tips. Such low-cost, compact lenses could be useful in mobile devices, data storage, surveillance, robotics, space applications, imaging, manufacturing with light and spatially resolved nonlinear microscopies.

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Citations

May 3, 2018·Optics Express·Katrine S RogersEdward T F Rogers
Apr 20, 2018·Advanced Materials·Kun HuangJinghua Teng
May 6, 2019·Optics Express·Dongliang TangJianjun Liu
Jun 25, 2019·Light, Science & Applications·Gang ChenCheng-Wei Qiu
Apr 15, 2020·Optics Letters·Yuyao ChenLuca Dal Negro
Dec 25, 2019·Applied Optics·Shima Gharbi GhebjaghStefan Sinzinger
Dec 3, 2020·Scientific Reports·Myunghwan Kim, Soeun Kim
Jan 6, 2021·Nature Communications·Fei QinXiangping Li
Mar 18, 2021·Optics Express·Xinjian LuXiangang Luo
Jun 19, 2021·Applied Optics·Shima Gharbi GhebjaghStefan Sinzinger
Nov 14, 2018·Nano Letters·Wei Ting ChenFederico Capasso
May 8, 2019·ACS Applied Materials & Interfaces·Guiyuan CaoBaohua Jia
Sep 5, 2019··Paul Y. WangHamid Hamid Chorsi

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Methods Mentioned

BETA
electron beam lithography
imaging techniques

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