Light Scattering Characterization of Optical Coatings
Summary
Light scattering characterisation of optical coatings examines how microscopic imperfections, layer interfaces and material inhomogeneities divert light from its intended path. This field combines precise measurement techniques, such as angle-resolved scatterometry and spectrally shaped illumination, with theoretical models based on perturbation theory and electromagnetic simulation. Surface and interface roughness, nodular defects and trapped modes within multilayer stacks each contribute to scatter losses that degrade imaging contrast, optical throughput and laser performance. Quantifying these losses is critical for applications ranging from high-precision mirrors in gravitational-wave detectors to broadband filters in telecommunications. Advances in instrumentation now enable ultra-sensitive detection over wide spectral ranges, while computational approaches allow full-stack simulations of scattering contributions. Together, these tools provide a comprehensive energy‐balance view of optical coatings, guiding the fabrication of ultra-low-loss surfaces and informing designs that minimise stray light in high-power and high-resolution systems.
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Light Scattering Characterization of Optical Coatings publication trend
The graph below shows the total number of articles in light scattering characterization of optical coatings across all publications each year (not limited to Nature Index journals).
Technical terms
Surface roughness: Microscopic deviations on a coating surface that scatter incident light into non-specular directions.
Angle-resolved scattering (ARS): A measurement technique that records scattered light intensity as a function of angle to map directional scatter distributions.
Bidirectional scattering distribution function (BSDF): A function describing how light is scattered by a surface or interface, as a function of incident and scattering angles.
Multilayer interference: Constructive and destructive interference arising from reflections at successive thin-film interfaces, affecting both specular reflection and scattering behaviour.
Trapped light modes: Guided electromagnetic modes within a multilayer stack, excited by interface roughness and contributing to internal scattering losses.
References
- Trapped light scattering within optical coatings: a multilayer roughness-coupling process.. Optics Express (2021).
- Anomalous light scattering from multilayer coatings with nodular defects.. Optics Express (2022).
- Immediate and one-point roughness measurements using spectrally shaped light.. Optics Express (2022).
- Surface characterization in fabrication environments using angle resolved light scattering: From roughness and defect analysis to in-situ coating inspection. EPJ Web of Conferences (2024).
- Light Scattering of optical Components and their Imperfections: Measurement, Modelling, and System Analysis. EPJ Web of Conferences (2024).
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