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Related Experiment Video

Updated: Jun 22, 2026

Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition
06:30

Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition

Published on: August 29, 2017

Wideband antireflection coatings by combining interference multilayers with structured top layers.

U Schulz1

  • 1Fraunhofer Institute of Applied Optics and Precision Engineering, A.-Einstein-Str. 7, 07745 Jena, Germany. ulrike.schulz@iof.fraunhofer.de

Optics Express
|May 26, 2009
PubMed
Summary

Nanostructured layers significantly improve antireflection properties by lowering the effective refractive index. This breakthrough enhances optical coatings beyond the limits of traditional interference layer stacks.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Residual reflectance in optical coatings is primarily determined by the refractive index of the outermost layer.
  • Traditional interference layer stacks using natural low- and high-index materials have limitations in reducing broad-wavelength reflectance.

Purpose of the Study:

  • To investigate methods for improving antireflection properties of optical coatings.
  • To explore the potential of nanostructured and porous layers in reducing residual reflectance.

Main Methods:

  • Fabrication of interference layer stacks using naturally available materials.
  • Incorporation of nanostructured (gradient) and porous layers as the final layer.
  • Characterization of residual reflectance across a broad wavelength range.

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Related Experiment Videos

Last Updated: Jun 22, 2026

Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition
06:30

Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition

Published on: August 29, 2017

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Main Results:

  • Nanostructured and porous layers exhibit a lower effective refractive index compared to natural materials.
  • Combining interference layer stacks with a final nanostructured layer significantly reduces residual reflectance.
  • The proposed approach overcomes the inherent limitations of conventional interference layer stacks.

Conclusions:

  • Nanostructured layers are highly effective in achieving superior antireflection performance.
  • The low effective index of nanostructured materials is key to enhancing optical coating efficiency.
  • This research offers a pathway to advanced optical coatings with improved broadband antireflection capabilities.