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Title: Investigations of porous oxides as an antireflective coating for glass surfaces

Abstract

There is no inorganic material that would satisfy the low index requirement of a single-layer antireflective coating for commercial soda-lime glasses. Such an antireflective coating would increase transmission 4--8% and cause corresponding efficiency increase in devices where energy is transmitted by radiation, e.g., solar collectors, and cathode ray tubes. MgF/sub 2/ with an index of 1.38 (vs 1.23 neeeded) is the lowest index coating material available and widely used by the industry. In this work, possible applications of porous oxide films as an antireflective coating were investigated. A porous aluminum oxide film is deposited on glass surfaces from a clear organometallic derived sol. The index of the oxide coating is reduced by the presence of pores whose size is <100 A; this constitutes up to 64% porosity. These pores, being considerably smaller than the wavelength of light, do not interfere with the optical transparency of the material but reduce the index of refraction; thus they make it possible to obtain transparent oxide materials and coatings with very low index.

Authors:
Publication Date:
Research Org.:
Westinghouse Research and Development Center, Ceramics and Glasses, Pittsburgh, Pennsylvania 15235
OSTI Identifier:
5486139
DOE Contract Number:  
EM-78-C-04-4228
Resource Type:
Journal Article
Journal Name:
Appl. Opt.; (United States)
Additional Journal Information:
Journal Volume: 19:9
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ALUMINIUM OXIDES; POROSITY; REFLECTIVITY; GLASS; ANTIREFLECTION COATINGS; FILMS; POROUS MATERIALS; REFRACTIVITY; ALUMINIUM COMPOUNDS; CHALCOGENIDES; COATINGS; MATERIALS; OPTICAL PROPERTIES; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SURFACE PROPERTIES; 420500* - Engineering- Materials Testing

Citation Formats

Yoldas, B E. Investigations of porous oxides as an antireflective coating for glass surfaces. United States: N. p., 1980. Web. doi:10.1364/AO.19.001425.
Yoldas, B E. Investigations of porous oxides as an antireflective coating for glass surfaces. United States. https://doi.org/10.1364/AO.19.001425
Yoldas, B E. 1980. "Investigations of porous oxides as an antireflective coating for glass surfaces". United States. https://doi.org/10.1364/AO.19.001425.
@article{osti_5486139,
title = {Investigations of porous oxides as an antireflective coating for glass surfaces},
author = {Yoldas, B E},
abstractNote = {There is no inorganic material that would satisfy the low index requirement of a single-layer antireflective coating for commercial soda-lime glasses. Such an antireflective coating would increase transmission 4--8% and cause corresponding efficiency increase in devices where energy is transmitted by radiation, e.g., solar collectors, and cathode ray tubes. MgF/sub 2/ with an index of 1.38 (vs 1.23 neeeded) is the lowest index coating material available and widely used by the industry. In this work, possible applications of porous oxide films as an antireflective coating were investigated. A porous aluminum oxide film is deposited on glass surfaces from a clear organometallic derived sol. The index of the oxide coating is reduced by the presence of pores whose size is <100 A; this constitutes up to 64% porosity. These pores, being considerably smaller than the wavelength of light, do not interfere with the optical transparency of the material but reduce the index of refraction; thus they make it possible to obtain transparent oxide materials and coatings with very low index.},
doi = {10.1364/AO.19.001425},
url = {https://www.osti.gov/biblio/5486139}, journal = {Appl. Opt.; (United States)},
number = ,
volume = 19:9,
place = {United States},
year = {Thu May 01 00:00:00 EDT 1980},
month = {Thu May 01 00:00:00 EDT 1980}
}