Achromatic super-oscillatory lenses with sub-wavelength focusing
Achromatic super-oscillatory lenses with sub-wavelength focusing
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.
achromatic, super-oscillation, super-resolution
Guanghui, Y.
84deec9f-b1cc-46fd-89d2-1320b5dfad05
Rogers, Edward
b92cc8ab-0d91-4b2e-b5c7-8a2f490a36a2
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
8 September 2017
Guanghui, Y.
84deec9f-b1cc-46fd-89d2-1320b5dfad05
Rogers, Edward
b92cc8ab-0d91-4b2e-b5c7-8a2f490a36a2
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Guanghui, Y., Rogers, Edward and Zheludev, Nikolai
(2017)
Achromatic super-oscillatory lenses with sub-wavelength focusing.
Light: Science & Applications, 6, [e17036].
(doi:10.1038/lsa.2017.36).
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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Accepted/In Press date: 5 March 2017
e-pub ahead of print date: 7 March 2017
Published date: 8 September 2017
Keywords:
achromatic, super-oscillation, super-resolution
Organisations:
Optoelectronics Research Centre
Identifiers
Local EPrints ID: 408183
URI: http://eprints.soton.ac.uk/id/eprint/408183
PURE UUID: 7cc77655-c110-42d2-8354-d92f5451b483
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Date deposited: 16 May 2017 04:02
Last modified: 16 Mar 2024 05:17
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Contributors
Author:
Y. Guanghui
Author:
Edward Rogers
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