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Optical modeling of black silicon using an effective medium/multi-layer approach.
Optics Express
|May 27, 2018
Summary
This study models black silicon (BSi) structures like nanocones and nanowires using effective medium theory (EMT) and the transfer matrix method (TMM). The model accurately predicts optical scattering in the infrared range, validated against experimental data.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Black silicon (BSi) exhibits unique optical properties due to its nanostructured surface.
- Accurate modeling of BSi optical scattering is crucial for device applications.
Purpose of the Study:
- To develop and validate a model for predicting the optical scattering of BSi nanocones and nanowires in the infrared spectrum.
- To investigate the influence of structural parameters on BSi optical properties.
Main Methods:
- Modeling BSi structures as multilayer stacks with varying effective refractive indices using Effective Medium Theory (EMT).
- Calculating optical scattering (reflectance, transmittance, absorptance) via the Transfer Matrix Method (TMM).
- Incorporating complex refractive index of silicon, considering doping levels and intrinsic absorption mechanisms.
Main Results:
- The EMT-TMM model shows good agreement with rigorous coupled wave analysis (RCWA) and experimental reflectance measurements of fabricated BSi samples.
- The model effectively accounts for the impact of aspect ratio, feature spacing, and structural disorder.
- The proposed model is validated against literature data for Silicon Nanowires (SiNWs).
Conclusions:
- The combination of EMT and TMM provides an efficient and accurate method for modeling the optical properties of black silicon.
- The developed model is suitable for analyzing infrared optical scattering in nanostructured silicon devices.
- This approach offers a computationally fast and easy-to-implement solution for BSi optical characterization.
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