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Title: Sequential Infiltration Synthesis for the Design of Low Refractive Index Surface Coatings with Controllable Thickness

Abstract

Control over refractive index and thickness of surface coatings is central to the design of low refraction films used in applications ranging from optical computing to antireflective coatings. Here, we introduce gas-phase sequential infiltration synthesis (SIS) as a robust, powerful, and efficient approach to deposit conformal coatings with very low refractive indices. We demonstrate that the refractive indices of inorganic coatings can be efficiently tuned by the number of cycles used in the SIS process, composition, and selective swelling of the of the polymer template. We show that the refractive index of Al2O3 can be lowered from 1.76 down to 1.1 using this method. The thickness of the Al2O3 coating can be efficiently controlled by the swelling of the block copolymer template in ethanol at elevated temperature, thereby enabling deposition of both single-layer and graded-index broadband antireflective coatings. Using this technique, Fresnel reflections of glass can be reduced to as low as 0.1% under normal illumination over a broad spectral range.

Authors:
 [1];  [2]; ORCiD logo; ;  [2]; ORCiD logo
  1. Materials Science and Engineering Department, University of North Texas, Denton, Texas 76203 United States
  2. Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637 United States
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE U.S. Department of Energy
OSTI Identifier:
1419940
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Nano; Journal Volume: 11; Journal Issue: 3
Country of Publication:
United States
Language:
English

Citation Formats

Berman, Diana, Guha, Supratik, Lee, Byeongdu, Elam, Jeffrey W., Darling, Seth B., and Shevchenko, Elena V. Sequential Infiltration Synthesis for the Design of Low Refractive Index Surface Coatings with Controllable Thickness. United States: N. p., 2017. Web. doi:10.1021/acsnano.6b08361.
Berman, Diana, Guha, Supratik, Lee, Byeongdu, Elam, Jeffrey W., Darling, Seth B., & Shevchenko, Elena V. Sequential Infiltration Synthesis for the Design of Low Refractive Index Surface Coatings with Controllable Thickness. United States. doi:10.1021/acsnano.6b08361.
Berman, Diana, Guha, Supratik, Lee, Byeongdu, Elam, Jeffrey W., Darling, Seth B., and Shevchenko, Elena V. Tue . "Sequential Infiltration Synthesis for the Design of Low Refractive Index Surface Coatings with Controllable Thickness". United States. doi:10.1021/acsnano.6b08361.
@article{osti_1419940,
title = {Sequential Infiltration Synthesis for the Design of Low Refractive Index Surface Coatings with Controllable Thickness},
author = {Berman, Diana and Guha, Supratik and Lee, Byeongdu and Elam, Jeffrey W. and Darling, Seth B. and Shevchenko, Elena V.},
abstractNote = {Control over refractive index and thickness of surface coatings is central to the design of low refraction films used in applications ranging from optical computing to antireflective coatings. Here, we introduce gas-phase sequential infiltration synthesis (SIS) as a robust, powerful, and efficient approach to deposit conformal coatings with very low refractive indices. We demonstrate that the refractive indices of inorganic coatings can be efficiently tuned by the number of cycles used in the SIS process, composition, and selective swelling of the of the polymer template. We show that the refractive index of Al2O3 can be lowered from 1.76 down to 1.1 using this method. The thickness of the Al2O3 coating can be efficiently controlled by the swelling of the block copolymer template in ethanol at elevated temperature, thereby enabling deposition of both single-layer and graded-index broadband antireflective coatings. Using this technique, Fresnel reflections of glass can be reduced to as low as 0.1% under normal illumination over a broad spectral range.},
doi = {10.1021/acsnano.6b08361},
journal = {ACS Nano},
number = 3,
volume = 11,
place = {United States},
year = {Tue Feb 07 00:00:00 EST 2017},
month = {Tue Feb 07 00:00:00 EST 2017}
}