Controllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci

Controllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci

Abstract The conventional multifocal optical elements cannot precisely control the focal number, spot size, as well as the energy distribution in between. Here, the binary amplitude-type super-oscillatory lens (SOL) is utilized, and a robust and universal optimization method based on the vectorial a...

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Autores principales: Muyuan Li, Wenli Li, Haoyong Li, Yechuan Zhu, Yiting Yu
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2017
Materias:
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Science
Q
Acceso en línea:https://doaj.org/article/5c83488651274e54bfe1f0518eb6b366
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spelling oai:doaj.org-article:5c83488651274e54bfe1f0518eb6b3662021-12-02T12:30:12ZControllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci10.1038/s41598-017-01492-y2045-2322https://doaj.org/article/5c83488651274e54bfe1f0518eb6b3662017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01492-yhttps://doaj.org/toc/2045-2322Abstract The conventional multifocal optical elements cannot precisely control the focal number, spot size, as well as the energy distribution in between. Here, the binary amplitude-type super-oscillatory lens (SOL) is utilized, and a robust and universal optimization method based on the vectorial angular spectrum (VAS) theory and the genetic algorithm (GA) is proposed, aiming to achieve the required focusing performance with arbitrary number of foci in preset energy distribution. Several typical designs of multifocal SOLs are demonstrated. Verified by the finite-difference time-domain (FDTD) numerical simulation, the designed multifocal SOLs agree well with the specific requirements. Moreover, the full-width at half-maximum (FWHM) of the achieved focal spots is close to λ/3 for all the cases (λ being the operating wavelength), which successfully breaks the diffraction limit. In addition, the designed SOLs are partially insensitive to the incident polarization state, functioning very well for both the linear polarization and circular polarization. The optimization method presented provides a useful design strategy for realizing a multiple sub-diffraction-limit foci field of SOLs. This research can find its potentials in such fields as parallel particle trapping and high-resolution microscopy imaging.Muyuan LiWenli LiHaoyong LiYechuan ZhuYiting YuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Muyuan Li
Wenli Li
Haoyong Li
Yechuan Zhu
Yiting Yu
Controllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci
description Abstract The conventional multifocal optical elements cannot precisely control the focal number, spot size, as well as the energy distribution in between. Here, the binary amplitude-type super-oscillatory lens (SOL) is utilized, and a robust and universal optimization method based on the vectorial angular spectrum (VAS) theory and the genetic algorithm (GA) is proposed, aiming to achieve the required focusing performance with arbitrary number of foci in preset energy distribution. Several typical designs of multifocal SOLs are demonstrated. Verified by the finite-difference time-domain (FDTD) numerical simulation, the designed multifocal SOLs agree well with the specific requirements. Moreover, the full-width at half-maximum (FWHM) of the achieved focal spots is close to λ/3 for all the cases (λ being the operating wavelength), which successfully breaks the diffraction limit. In addition, the designed SOLs are partially insensitive to the incident polarization state, functioning very well for both the linear polarization and circular polarization. The optimization method presented provides a useful design strategy for realizing a multiple sub-diffraction-limit foci field of SOLs. This research can find its potentials in such fields as parallel particle trapping and high-resolution microscopy imaging.
format article
author Muyuan Li
Wenli Li
Haoyong Li
Yechuan Zhu
Yiting Yu
author_facet Muyuan Li
Wenli Li
Haoyong Li
Yechuan Zhu
Yiting Yu
author_sort Muyuan Li
title Controllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci
title_short Controllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci
title_full Controllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci
title_fullStr Controllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci
title_full_unstemmed Controllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci
title_sort controllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci
publisher Nature Portfolio
publishDate 2017
url https://doaj.org/article/5c83488651274e54bfe1f0518eb6b366
work_keys_str_mv AT muyuanli controllabledesignofsuperoscillatorylenseswithmultiplesubdiffractionlimitfoci
AT wenlili controllabledesignofsuperoscillatorylenseswithmultiplesubdiffractionlimitfoci
AT haoyongli controllabledesignofsuperoscillatorylenseswithmultiplesubdiffractionlimitfoci
AT yechuanzhu controllabledesignofsuperoscillatorylenseswithmultiplesubdiffractionlimitfoci
AT yitingyu controllabledesignofsuperoscillatorylenseswithmultiplesubdiffractionlimitfoci
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