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Updated: Jan 25, 2026
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
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Planar Aperiodic Arrays as Metasurfaces for Optical Near-Field Patterning
Mario Miscuglio1,2, Nicholas J Borys3, Davide Spirito1
1Istituto Italiano di Tecnologia , Via Morego 30 , 16163 Genova , Italy.
ACS Nano
|April 26, 2019
Summary
Researchers designed plasmonic metasurfaces using gold nanostructures to control light
Area of Science:
- Nanophotonics
- Plasmonics
- Metasurfaces
Background:
- Flat optics utilizes nanostructured surfaces to replace bulky optical elements.
- Plasmonic metasurfaces offer capabilities beyond traditional far-field optics, enabling near-field manipulation.
Purpose of the Study:
- To design plasmonic metasurfaces for tailoring optical near-fields in visible and near-infrared spectra.
- To achieve active control of near-field patterns using far-field illumination.
Main Methods:
- Aperiodic arrays of plasmonic gold nanostructures (rhomboids) were designed.
- Two-photon photoluminescence was used to probe near-field profiles.
- Finite element method simulations were employed to analyze near-field modulation.
Main Results:
- Demonstrated molding of light into distinct near-field intensity patterns.
- Achieved active control of near-field patterns via far-field illumination.
- Near-field modulation resulted from plasmonic resonances and nanoscale gap field enhancement.
Conclusions:
- Developed optical elements capable of switching near-field distribution.
- Enabled wavelength and polarization control of near-field patterns.
- Provided pathways for light-matter interactions in integrated devices.
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