ChemInform Abstract: Sol‐Gel Synthesis of Nanocrystalline Magnesium Fluoride: Its Use in the Preparation of MgF2 Films and MgF2‐SiO2 Composites.

Rywak, Anthony A.; Burlitch, James M.

doi:10.1002/chin.199617260

Cited by 1 publication

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“…These values are far below the lowest refractive index known for bulk inorganic materials such as the widely used MgF 2 in the design of ARCs. 36 The swelling property of the BCP is essential for the deposition of ARCs since it allows for tuning the thickness of the surface coating, which is critical for achieving a low reflectivity in a specific, targeted spectral range. Figure 6 shows that swelling of a 400 nm-thick PS-b-P4VP film in ethanol for 1 h at 75 °C leads to a 447 nm-thick porous Al 2 O 3 SIS film, while no swelling results in the thickness limited by ∼48 nm value (Figure 6a).…”

Section: Resultsmentioning

confidence: 99%

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

Berman

Guha

Lee³

et al. 2017

ACS Nano

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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 AlO can be lowered from 1.76 down to 1.1 using this method. The thickness of the AlO 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.

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Section: Resultsmentioning

confidence: 99%