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  Black and white fused silica: modified sol-gel process combined with moth-eye structuring for highly absorbing and diffuse reflecting SiO2 glass

Brunner, R., Kraus, M., Hirte, J., Diao, Z., Weishaupt, K., Spatz, J. P., et al. (2020). Black and white fused silica: modified sol-gel process combined with moth-eye structuring for highly absorbing and diffuse reflecting SiO2 glass. Optics Express, 28(22), 32499-32516. doi:10.1364/OE.406150.

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 Creators:
Brunner, Robert, Author
Kraus, Matthias, Author
Hirte, Johannes1, Author              
Diao, Zhaolu1, Author              
Weishaupt, Klaus1, Author              
Spatz, Joachim P.1, Author              
Harzendorf, Torsten, Author
Trost, Marcus, Author
Munser, Anne-Sophie, Author
Schröder, Sven, Author
Baer, Michael, Author
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1Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_2364731              

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 Abstract: Diffuse reflecting (white) and highly absorbing (black) fused silica based materials are presented, which combine volume modified substrates and surfaces equipped with anti-reflective moth-eye-structures. For diffuse reflection, micrometer sized cavities are created in bulk fused silica during a sol-gel process. In contrast, carbon black particles are added to get the highly absorbing material. The moth-eye-structures are prepared by block copolymer micelle nanolithography (BCML), followed by a reactive-ion-etching (RIE) step. The moth-eye-structures drastically reduce the specular reflectance on both diffuse reflecting and highly absorbing samples across a wide spectral range from 250 nm to 2500 nm and for varying incidence angles. The adjustment of the height of the moth-eye-structures allows us to select the spectral position of the specular reflectance minimum, which measures less than 0.1%. Diffuse Lambertian-like scattering and absorbance appear nearly uniform across the selected spectral range, showing a slight decrease with increasing wavelength.

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Language(s): eng - English
 Dates: 2020-09-252020-08-212020-09-252020-10-132020-10-26
 Publication Status: Published in print
 Pages: 18
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1364/OE.406150
 Degree: -

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Title: Optics Express
  Abbreviation : Opt. Express
Source Genre: Journal
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Publ. Info: Washington, DC : Optical Society of America
Pages: - Volume / Issue: 28 (22) Sequence Number: - Start / End Page: 32499 - 32516 Identifier: ISSN: 1094-4087
CoNE: https://pure.mpg.de/cone/journals/resource/954925609918