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Designing with very thin optical films.

Ronald R Willey, Audrius Valavičius, Fred T Goldstein

    Applied Optics
    |April 1, 2020
    PubMed
    Summary

    New software accounts for thickness-dependent optical properties in thin film design. This "double dispersion" approach improves the accuracy of optical coatings for applications like plasmonics and quantum dots.

    Area of Science:

    • Materials Science
    • Optical Engineering
    • Nanotechnology

    Background:

    • Thin films with thicknesses of 10 nm or less are crucial for applications including nanoparticles, plasmonics, and quantum dots.
    • The optical properties (refractive indices n and k) of these films are influenced by interfacing materials and fabrication parameters.
    • Typically, n and k values vary with film thickness until a threshold (often >20 nm) is reached.

    Purpose of the Study:

    • To introduce a novel software approach for designing thin films that incorporates thickness-dependent optical properties.
    • To address the limitation of previous design methods that did not account for variations in refractive indices with film thickness.
    • To enable more accurate and reliable optical coating designs.

    Main Methods:

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  • Development of specialized software that computes the refractive indices (n and k) at specific thicknesses during the design optimization.
  • Integration of "double dispersion" into the design process, considering both wavelength and thickness dependencies of optical properties.
  • Iterative computation of optical properties within the software for enhanced design accuracy.

    • Main Results:

    • The developed software allows for the computation of thickness-specific optical indices (n and k) at each design iteration.
    • This approach leads to more realistic design outcomes by fully representing the behavior of thin film layers.
    • Resulting optical coatings produced using this method show improved agreement with their intended designs.

    Conclusions:

    • Accounting for thickness-dependent optical properties, termed "double dispersion," is essential for accurate thin film design.
    • The new software provides a more realistic and effective tool for designing optical coatings for advanced applications.
    • This methodology enhances the correlation between optical coating designs and their actual performance upon fabrication.