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Updated: Jun 23, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
Generation of an axially asymmetric Bessel-like beam from a metallic subwavelength aperture
Zhaofeng Li1, Kamil Boratay Alici, Humeyra Caglayan
1Nanotechnology Research Center, Department of Physics, Bilkent University, Bilkent, 06800 Ankara, Turkey. zhaofengli@bilkent.edu.tr
Abstract:
An electromagnetic nondiffractive Bessel-like beam from a subwavelength aperture is generated by placing a metallic circular gratinglike structure in front of the aperture. When the incident wave is linearly polarized, the beam is axially asymmetric. The beam possesses fluctuating, but approximately uniform, intensity distribution along its longitudinal axis. The full width at half maximum of the beam remains less than two wavelengths over nearly ten wavelengths. Our experimental results are in good agreement with the simulation results and analytical results.
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