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Related Experiment Video

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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Highly transparent sapphire micro-grating structures with large diffuse light scattering.

Yeong Hwan Ko1, Jae Su Yu

  • 1Department of Electronics and Radio Engineering, Kyung Hee University, 1 Seocheon-dong, Giheung-gu, Yongin 446-701, Republic of Korea.

Optics Express
|September 22, 2011
PubMed
Summary
This summary is machine-generated.

Optimized micro-grating structures (MGSs) on sapphire enhance light scattering and transparency. Depositing SiO2 further boosts transmittance, validated by theory and experiments for optical applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Micro-grating structures (MGSs) are crucial for controlling light interaction.
  • Sapphire substrates offer excellent optical and mechanical properties.
  • Achieving high transparency with significant diffuse light scattering is challenging.

Purpose of the Study:

  • To theoretically and experimentally investigate sapphire MGSs for enhanced optical properties.
  • To optimize MGS design for maximum transmittance and diffuse scattering.
  • To evaluate the effect of SiO2 deposition on transmittance.

Main Methods:

  • Finite difference time domain (FDTD) simulations for light scattering analysis.
  • Rigorous coupled wave analysis (RCWA) for theoretical optimization.
  • Fabrication of sapphire MGSs using lithography and dry etching.
  • Optical transmittance measurements before and after SiO2 deposition.

Main Results:

  • Diffuse light scattering strongly depends on grating structure size.
  • Optimized MGS geometry (taper, width, height, pitch) maximized transmittance (300-1800 nm).
  • SiO2 deposition increased total transmittance due to a graded refractive index profile.
  • Enhanced diffuse scattering was maintained after SiO2 deposition.

Conclusions:

  • Sapphire MGSs can be effectively designed for high transparency and diffuse light scattering.
  • SiO2 coating further improves transmittance while preserving scattering properties.
  • Experimental results align well with theoretical predictions, confirming design feasibility.