Plasmonic Metalens for Narrowband Dual-Focus Imaging
Advanced Optical Materials
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Williams, C., Montelongo, Y., & Wilkinson, T. (2017). Plasmonic Metalens for Narrowband Dual-Focus Imaging. Advanced Optical Materials https://doi.org/10.1002/adom.201700811
A new type of metalens with the capability to selectively focus narrowband light is reported at different focal planes depending on polarization. Two zone planes with two different focal lengths are spatially multiplexed and encoded in the subwavelength regime with arrays of orthogonal silver nanostructures, which are designed to exhibit strong wavelength- and polarization-dependent scattering profiles. Using this principle, imaging under white-light illumination with independent focal planes is experimentally demonstrated for each polarization at the narrowband resonant wavelength. Furthermore, each focal plane can be dynamically controlled with an output polarizer. In contrast to conventional refractive and diffractive optical elements, functional metalenses allow additional control over wavelength and polarization properties of light for a wide range of applications.
diffractive lenses, holographic optical elements, metasurfaces, plasmonics, polarization-selective devices, subwavelength structures
This work was ﬁnancially supported by the Engineering and Physical Sciences Research Council (EPSRC): Integrated Photonic and Electronic Systems (EP/L015455/1); Cambridge Overseas Trust and the Mexican National Council on Science and Technology (CONACyT).
Cancer Research UK (21102)
Cancer Research UK (24669)
UNIVERSITY COLLEGE LONDON (FB EPSRC) (EP/L015455/1)
External DOI: https://doi.org/10.1002/adom.201700811
This record's URL: https://www.repository.cam.ac.uk/handle/1810/268159
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/
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