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KMID : 1159320150170030203
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Korean Journal of Vision Science
2015 Volume.17 No. 3 p.203 ~ p.212
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Study of the refractive index of the coating film on the Ophthalmic lens according to nanostructures shape
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Park Moon-Chan
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Abstract
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Purpose: A refractive index according to a nanostructured shape was investigated, which was accumulated a hard-coating film and a SiO2 film on an Ophthalmic lens with no curvature and was designed as hole using a FDTD simulator.
Method: the hard-coating film with 1.5 μm thickness and the SiO2 film with varying from 100 nm to 900 nm were designed on the lens. The nanostructures were made of cylindrical holes in the SiO2 film and an arrangement of the holes was hexagonal in the simulator. the radii of the holes were changed when the depths of the holes and the periods of the holes were fixed, and the refractive indexes of the SiO2 nanostructures were calculated to find the position of wavelength where the reflection was at a minimum. And the reflection spectra were observed according to the depth when the depth of the holes was changed at the fixing radius and period of the holes. And also the reflection spectra were observed according to the depth at the fixing radius and period of the holes. In addition, when the holes were arranged in square to analyze the spectra according to the period, the reflection spectra were observed.
Result: The radii of the holes were changed at the fixing depth of 100 nm and the fixing period of 300 nm, and in the radius of 70 nm the position of wavelength was 508 nm where reflectance was zero. At this time, the refractive index of the SiO2 nanostructure was 1.27 by the destructive interference condition, while the index was 1.24 by the amplitude condition. Two values were found to be similar. And a interference was taking place in the height of 100 nm or more, and the number
of wavelength of forming the maximum and minimum reflectivity in shape was increased as the height was deeper. In addition, anti-reflection effect appeared in the period of 100 nm to 300 nm and anti-reflection effect and diffraction phenomena were combined in the period of above 400 nm.
Conclusion: the refractive index of the SiO2 nanostructure was 1.27 by the destructive interference condition, while the index was 1.24 by the amplitude condition. In addition, anti-reflection effect appeared in the period of 100 nm to 300 nm, anti-reflection effect and diffraction phenomena were combined in the period of above 400 nm.
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KEYWORD
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FDTD, nanopattern, the coating film on the Ophthalmic lens, the refractive index
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