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Tunable Structural Color in Au-Based One-Dimensional Hyperbolic Metamaterials.

Ricardo Téllez-Limón1, René I Rodríguez-Beltrán1, Fernando López-Rayón2

  • 1SECIHTI-Centro de Investigación Científica y de Educación Superior de Ensenada, Unidad Académica Monterrey, Alianza Centro 504, PIIT, Apodaca 66629, Nuevo León, Mexico.

Nanomaterials (Basel, Switzerland)
|December 24, 2025
PubMed
Summary
This summary is machine-generated.

Structural coloration in gold metamaterials can be finely tuned by adjusting structural parameters. This research demonstrates controllable color properties in one-dimensional hyperbolic metamaterials (1D-HMMs) for photonic applications.

Keywords:
metamaterialsmetaphotonicsnano-opticsstructural color

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Area of Science:

  • Nanophotonics
  • Materials Science
  • Optics

Background:

  • Structural coloration from nanoscale light-matter interactions is a key nanophotonics research area.
  • Noble metals like gold offer plasmonic properties but often require complex nanostructures for coloration.
  • Scalable methods for tunable structural colors are crucial for modern photonic technologies.

Purpose of the Study:

  • To experimentally and numerically demonstrate fine tunability of structural color in gold-based one-dimensional hyperbolic metamaterials (1D-HMMs).
  • To investigate the impact of varying structural parameters (number of layers N, period T, filling fraction p) on color properties.

Main Methods:

  • Fabrication and characterization of gold-based 1D-HMMs.
  • Numerical simulations to model light-matter interactions and color response.
  • Systematic variation of structural parameters (N, T, p) to analyze their effect on color.

Main Results:

  • Varying the number of layers (N) primarily affects luminance with minimal chromaticity shifts.
  • Changes in period (T) cause moderate color shifts without impacting luminance.
  • Modifying the filling fraction (p) leads to the most significant, albeit non-monotonic, chromaticity changes.

Conclusions:

  • Gold-based 1D-HMMs offer a tunable platform for structural coloration.
  • Structural parameters provide distinct control over luminance and chromaticity.
  • These findings support the development of advanced photonic devices utilizing controlled gold-based colors.