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Related Experiment Video

Updated: Oct 17, 2025

Microfabrication of Nanoporous Gold Patterns for Cell-material Interaction Studies
13:02

Microfabrication of Nanoporous Gold Patterns for Cell-material Interaction Studies

Published on: July 15, 2013

11.5K

Gold-black manufacture, microstructure, and optical characterization.

Nazia B Munir, J R Mahan, Luan C Doan

    Applied Optics
    |October 6, 2021
    PubMed
    Summary

    This study validates a dipole antenna theory for gold-black absorptance. Experimental measurements of gold-black coatings confirm the theory

    Area of Science:

    • Nanophotonics and Metamaterials
    • Optical Engineering
    • Materials Science

    Background:

    • Gold-black is a nanostructured material known for its broadband absorption properties.
    • A prior theoretical model described gold-black's polarization-sensitive spectral absorptance using dipole antenna theory.
    • Experimental validation of this theory was lacking, particularly for directional properties.

    Purpose of the Study:

    • To experimentally validate the first-principle dipole antenna theory for gold-black.
    • To measure the polarization-sensitive directional spectral absorptance of gold-black coatings.
    • To assess the theory's accuracy across a range of incident angles and wavelengths.

    Main Methods:

    • Fabrication of gold-black coatings (4- and 8-µm thick) using a custom vapor-deposition cell on a gold substrate.

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    Last Updated: Oct 17, 2025

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  • Microstructural characterization of the coatings via scanning electron microscopy (SEM).
  • Automated measurement of in-plane bidirectional reflectivity at 532 nm and 800 nm for p- and s-polarized light using a reflectometer.

    • Main Results:

    • SEM images revealed the microstructure of the gold-black coatings.
    • Bidirectional reflectivity measurements were obtained for incident zenith angles from 10 to 50 degrees.
    • Experimental results demonstrated consistency with the predictions of the dipole antenna theory within the measured angular range.

    Conclusions:

    • The dipole antenna theory successfully predicts the polarization-sensitive directional spectral absorptance of gold-black.
    • The experimental validation supports the theoretical framework for understanding light interaction with gold-black nanostructures.
    • This work provides a foundation for designing and optimizing gold-black for specific optical applications.