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Random-phase metasurfaces at optical wavelengths.

Anders Pors1, Fei Ding1, Yiting Chen1

  • 1SDU Nano Optics, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark.

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|June 23, 2016
PubMed
Summary
This summary is machine-generated.

Random-phase metasurfaces scatter light diffusely, enabling statistical analysis of their complex far-field response. This study demonstrates their design and realization, with potential applications in camouflage and security.

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Area of Science:

  • Metasurfaces and Nanophotonics
  • Statistical Optics

Background:

  • Random-phase metasurfaces exhibit diffuse scattering due to random phase shifts from constituent elements.
  • Their far-field response is complex and best described using statistical methods.

Purpose of the Study:

  • To present and exemplify the statistical description of far-field response for random-phase metasurfaces.
  • To investigate the influence of polarization on scattering properties based on phase correlations.
  • To design and realize random-phase metasurfaces for specific applications.

Main Methods:

  • Utilizing gap plasmon-based metasurfaces composed of gold films, glass spacers, and gold nanobricks.
  • Designing metasurfaces for operation at a wavelength of 800 nm.
  • Optical characterization to verify diffuse scattering and statistical predictions.

Main Results:

  • Fabricated random-phase metasurfaces demonstrated convincing diffuse scattering of reflected light.
  • Experimental results aligned with theoretical statistical predictions.
  • The study highlighted similarities and differences in response for polarized and unpolarized light.

Conclusions:

  • Random-phase metasurfaces can be statistically described and experimentally realized.
  • Potential applications include camouflage, dark-field microscopy references, and security features.
  • Correlated scattering can lead to novel functionalities like Lambertian reflection.