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 half wavelength of light. Pupil filters, initi...

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Bibliographic Details
Main Authors: Yuan, Guang Hui, Rogers, Edward T. F., Zheludev, Nikolay I.
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2017
Subjects:
Online Access:https://hdl.handle.net/10356/82939
http://hdl.handle.net/10220/42420
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Institution: Nanyang Technological University
Language: English
Description
Summary: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 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 – 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.