Sub-wavelength annular-slit-assisted superoscillatory lens for longitudinally-polarized super-resolution focusing

A binary metallic superoscillatory lens assisted with annular subwavelength slits is proposed, which generates a longitudinally-polarized super-resolution focal point. The annular slits are designed to selectively transmit radially-polarized light. Simulations using the finite element method show a...

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Bibliographic Details
Published inScientific reports Vol. 10; no. 1; p. 1328
Main Authors Kim, Hyuntai, Rogers, Edward T F
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 28.01.2020
Nature Publishing Group UK
Subjects
Design
Efficiency
Finite element analysis
Finite element method
Light
Optics
Polarized light
Symmetry
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Summary:A binary metallic superoscillatory lens assisted with annular subwavelength slits is proposed, which generates a longitudinally-polarized super-resolution focal point. The annular slits are designed to selectively transmit radially-polarized light. Simulations using the finite element method show a 0.24 λ focal spot with 21.8 dB of polarization purity and only 0.342 dB reduction in efficiency compared to a standard superoscillatory lens.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-56810-3