Optimal dimensions of cone and pyramid moth-eye structures for SiO₂ windows





Citation of Original Publication


This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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We computationally investigate the transmission efficiency through moth-eye nanostructures that are fabricated on SiO₂ windows in the wavelength range from 0.4 to 2 μm. We investigated both truncated cones and truncated pyramids, and we varied the height, bottom width, and top width of these shapes in order to maximize the transmission efficiency. We found that there is no substantial difference in transmission between truncated cone and pyramid structures. Using the constraints from the current achievable experimental limits, a relatively uniform transmission coefficient of larger than 98.8% can be obtained from 0.4 μm to 2 μm. These transmission results are only 0.4% in absolute value lower than the transmission of a structure that is not constrained by current experimental limits.