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Inversion of the Complex Refractive Index of Au-Ag Alloy Nanospheres Based on the Contour Intersection Method
Long Cheng1, Paerhatijiang Tuersun1, Dengpan Ma1
1Xinjiang Key Laboratory for Luminescence Minerals and Optical Functional Materials, School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, China.
Materials (Basel, Switzerland)
|May 13, 2023
Summary
The contour intersection method accurately determines the complex refractive index of nanoparticles, outperforming traditional iterative methods. This technique is reliable even with up to 5% measurement error for gold-silver alloy nanospheres.
Area of Science:
- Nanoparticle characterization
- Optical properties of materials
- Computational physics
Background:
- The complex refractive index is crucial for understanding nanoparticle optical properties.
- Existing methods for complex refractive index inversion have limitations, especially for nanoparticles.
- The contour intersection method is a novel approach for optical property inversion.
Purpose of the Study:
- To investigate the feasibility and reliability of the contour intersection method for inverting the complex refractive index of nanoparticles.
- To apply the method to gold-silver (Au-Ag) alloy nanospheres.
- To compare the contour intersection method with traditional iterative techniques.
Main Methods:
- Utilized Mie theory and size-dependent dielectric functions to calculate optical efficiencies.
- Employed the contour intersection method for complex refractive index inversion.
- Applied backscattering efficiency constraint to ensure unique solutions.
- Analyzed the impact of composition, size, and measurement errors.
Main Results:
- The contour intersection method successfully inverted the complex refractive index of Au-Ag alloy nanospheres.
- Accurate results were achieved with measurement errors below 5%.
- The contour intersection method demonstrated superior accuracy compared to iterative methods.
Conclusions:
- The contour intersection method offers a simple, reliable, and accurate approach for determining the complex refractive index of Au-Ag alloy nanospheres.
- The method's accuracy is robust against variations in composition and particle size.
- This technique is valuable for nanoparticle characterization and optical property analysis.
