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Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition

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Modelling structural colour from helicoidal multi-layer thin films with natural disorder.

T J Davis, L Ospina-Rozo, D Stuart-Fox

|November 29, 2023

Summary

This summary is machine-generated.

This study models light scattering from beetles using coupled mode theory. The method accurately predicts reflectance by analyzing structural disorder in helicoidal arrays, crucial for understanding beetle coloration.

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Area of Science:

Optics and Photonics
Materials Science
Biophysics

Background:

Periodic nanostructures in nature, like those in beetle elytra, produce structural coloration through light scattering.
Understanding the optical properties of these biological materials is complex due to inherent structural disorder.
Existing models often struggle to account for biological assembly imperfections and material anisotropy.

Purpose of the Study:

To extend coupled mode theory based on Takagi-Taupin equations to analyze light scattering from distorted periodic arrays.
To incorporate perturbations in the permittivity tensor for helicoidal arrays and anisotropic layered materials.
To investigate the impact of structural disorder on optical properties in beetle elytra.

Main Methods:

Applied coupled mode theory using Takagi-Taupin equations to model electromagnetic scattering.
Extended the theory to include anisotropic permittivity tensor perturbations.
Integrated structural information and disorder parameters from transmission electron microscopy data.

Main Results:

Achieved good agreement between model predictions and experimental spectral reflectance measurements (specular and non-specular).
Demonstrated the capability to analyze scattering from helicoidal arrays with dislocations and other structural variations.
Validated the model's effectiveness for optically anisotropic layered materials.

Conclusions:

The extended coupled mode theory accurately describes light scattering from biologically relevant distorted periodic structures.
This approach provides a powerful tool for correlating structural disorder with optical properties in natural materials.
The findings offer insights into the mechanisms of structural coloration in beetles and other anisotropic materials.