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Layered Babinet complementary patterns acting as asymmetric negative index metamaterial.

Emese Tóth1,2, Olivér A Fekete1,2, Balázs Bánhelyi2,3

  • 1Department of Optics and Quantum Electronics, University of Szeged, Dóm tér 9, Szeged, 6720, Hungary.

Scientific Reports
|November 28, 2024
PubMed
Summary

This study demonstrates asymmetric optical responses in multilayer nanostructures, showing potential for novel negative index materials (NIMs) and nonreciprocal nanophotonic elements with unique polarization properties.

Keywords:
Asymmetric transmissionAzimuthal orientationChiralityCircular dichroismDisplacement currentMagnetic dipoles

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Area of Science:

  • Nanophotonics
  • Metamaterials
  • Optical Engineering

Background:

  • Investigating optical responses of subwavelength periodic arrays is crucial for advanced photonic devices.
  • Understanding asymmetric transmission and dichroism is key to controlling light-matter interactions at the nanoscale.

Purpose of the Study:

  • To demonstrate azimuthal orientation and handedness dependence of optical responses in multilayered Babinet complementary miniarrays.
  • To explore the negative index material (NIM) phenomenon and its associated electromagnetic responses.
  • To propose the multilayer as an ultrathin NIM and nonreciprocal nanophotonic element.

Main Methods:

  • Fabrication of multilayered nanostructures with subwavelength periodic arrays.
  • Illumination with linearly and circularly polarized light, including counter-propagating beams.
  • Analysis of asymmetric transmission, dichroism, reflectance, and absorptance spectra.
  • Characterization of electric and magnetic dipole and multipole responses.

Main Results:

  • Observed asymmetric optical responses, including transmission and dichroism, dependent on polarization and orientation.
  • Demonstrated the negative index material (NIM) phenomenon with overlapping electric and magnetic dipoles.
  • Correlated asymmetric transmission with asymmetric displacement currents and dichroism with tilted magnetic dipoles.
  • Identified flat bands in dispersion maps indicating partially dichroic phenomena and maximum Tellegen coefficients.

Conclusions:

  • The multilayered nanostructures exhibit significant asymmetric optical responses.
  • The demonstrated NIM phenomenon and polarization control capabilities highlight potential applications.
  • The proposed multilayer serves as a promising ultrathin NIM and nonreciprocal nanophotonic element.