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Three-layer tri-wavelength broadband antireflective coatings built from refractive indices controlled silica thin films

  • Original Paper: Functional coatings, thin films and membranes (including deposition techniques)
  • Published:
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Abstract

A three-layer tri-wavelength broadband antireflective (AR) coating with 100 % transmittance simultaneously at 1064, 532 and 355 nm was designed using TFCalc™ thin film design software. The refractive indices for the bottom, middle and top layers of the designed AR coating are 1.33, 1.21 and 1.10, respectively. To realize the designed AR coating, a template-free sol–gel process was proposed to regulate the refractive index of silica film from 1.09 to 1.44 by simple hybridization. Silica films with refractive index of 1.21–1.44 were prepared by the hybridization of acid-catalyzed silica and base-catalyzed silica, while organically modified silicates films with refractive index of 1.09–1.21 were prepared by the hybridization of tetraethoxysilane, methyltriethoxysilane and hexamethyldisilazane under base-catalyzed condition. These two hybridization methods could conveniently control the porosity, and hence the refractive index of films. Finally, the three-layer tri-wavelength broadband AR coating, which is very important in high-power laser systems, was realized with the transmittance of 99.9, 99.8 and 99.4 % at 1064, 532 and 355 nm, respectively.

Graphical Abstract

A three-layer tri-wavelength broadband antireflection coating with nearly 100 % transmittance simultaneously at 1064, 532 and 355 nm is designed by TFCalc™ thin film design software and prepared by a simple sol–gel process. A template-free sol–gel process was proposed to prepare silica films with controlled and ultra-low refractive index.

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Acknowledgments

The authors thank Ms. S. L. Wang for performing TEM observations.

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Authors and Affiliations

  1. Key Laboratory of Green Chemistry and Technology, College of Chemistry, Sichuan University, Chengdu, 610064, China

    Longqiang Ye, Yulu Zhang, Yuanyang Li & Bo Jiang

  2. College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou, 350002, China

    Xinxiang Zhang

  3. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, China

    Wanguo Zheng

Authors
  1. Longqiang Ye
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  2. Xinxiang Zhang
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  3. Yulu Zhang
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  4. Yuanyang Li
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  6. Bo Jiang
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Corresponding authors

Correspondence to Wanguo Zheng or Bo Jiang.

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Ye, L., Zhang, X., Zhang, Y. et al. Three-layer tri-wavelength broadband antireflective coatings built from refractive indices controlled silica thin films. J Sol-Gel Sci Technol 80, 1–9 (2016). https://doi.org/10.1007/s10971-016-4051-y

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  • DOI: https://doi.org/10.1007/s10971-016-4051-y

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