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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Metamaterials with hyperbolic dispersion offer unique optical properties.
  • Controlling light emission from dye molecules on nanostructured surfaces is crucial for optoelectronic applications.

Purpose of the Study:

  • To investigate the angular distribution of dye molecule emission on two types of hyperbolic metamaterials: lamellar metal/dielectric and silicon/silver nanowire arrays.
  • To compare experimental results with theoretical predictions and effective medium models.

Main Methods:

  • Fabrication of lamellar metal/dielectric and Si/Ag nanowire metamaterials.
  • Deposition of dye molecules onto the metamaterial surfaces.
  • Measurement of the angular distribution of emitted light from the dye molecules.

Main Results:

  • Emission patterns of dye on lamellar metamaterials matched theoretical predictions for metal surfaces.
  • Experimental emission patterns for nanowire metamaterials deviated from effective medium model predictions.
  • A nearly Lambertian (∝cosθ) emission pattern was observed for the nanowire-based sample.

Conclusions:

  • The emission pattern of dye on lamellar metamaterials is consistent with theoretical expectations.
  • The effective medium model fails to accurately predict emission from Si/Ag nanowire metamaterials.
  • Surface roughness is proposed as a tentative explanation for the observed emission pattern in nanowire-based samples.