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Published on: April 26, 2014
Near-field characterization of effective optical interfaces
A Apostol1, D Haefner, A Dogariu
1CREOL, College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816-2700, USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 7, 2007
Summary
Researchers can now separate surface roughness from optical property variations in heterogeneous media. A random-walk model quantifies dielectric fluctuations, revealing subwavelength morphology for better optical characterization.
Area of Science:
- Optics and Photonics
- Materials Science
- Physics
Background:
- Heterogeneous media properties depend on surface roughness and local optical variations.
- Effective optical interfaces are commonly used to model these media.
- Decoupling these influences is crucial for accurate characterization.
Purpose of the Study:
- To develop a method for quantitatively assessing the contributions of surface roughness and optical property variations in heterogeneous media.
- To utilize near-field optics and discrete random-walk models for detailed analysis.
- To determine dielectric constant fluctuations at subwavelength scales.
Main Methods:
- Employing near-field optics approaches to decouple surface roughness and local optical property variations.
- Utilizing a discrete random-walk model.
- Analyzing subwavelength scale dielectric constant fluctuations.
Main Results:
- Successfully decoupled the effects of surface roughness and local optical property variations.
- Quantitatively assessed the individual contributions of these two factors.
- Determined the magnitude of dielectric constant fluctuations using the random-walk model, linking them to media morphology.
Conclusions:
- Near-field optics enables the separation of surface and bulk optical effects in heterogeneous media.
- The discrete random-walk model provides a tool to quantify subwavelength dielectric variations and understand media morphology.
- This approach offers a more precise characterization of optically inhomogeneous materials.
