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KMID : 1159320150170020115
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Korean Journal of Vision Science
2015 Volume.17 No. 2 p.115 ~ p.122
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FDTD simulation on the antireflection effect about nanopatterning for Ophthalmic superhyphobolic lenses
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Park Moon-Chan
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Abstract
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Purpose: This paper was to study the antireflection effect with the pattern of nanostructures by calculating the reflectance, which were coated on Ophthalmic lenses with no curvature.
Method: The reflectances for the nanostructures on the lenses were calculated using the FDTD simulator. A hard-coating on the lens with a refractive index of 1.55 was coated with a thickness of 3μm, and the thickness of the SiO2 film on a hard-coating was varied from 100nm to 900nm. Nanostructures made in SiO2 layer formed a inverted cone shape, which was arranged as hexagonal to make the volume fraction maximum in SiO2 layer. The period, depth, and radius of the inverted cone were varied. Also the contour map of reflectances was made to find the best antireflection effect.
Results: The results of calculating the reflectance of the lens with no curvature were that the simulation period was optimal at between 100nm and 300nm. the optimal of inverted cone depth was above 700nm, and the optimum was that the cone radius was half of period. The average reflectance of the spectacle lens was 0.15% in the optimum state.
Conclusion: It was expected that a inverted cone nanostructures on the Ophthalmic lens made the lens superhydrophobic, and was substitute for the antireflection multilayer of the lens.
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KEYWORD
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FDTD, nanopattern, Ophthalmic lens, antireflection effect
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