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Thickness effects of anti-reflection coating with graded refractive index structure

机译：Thickness effects of anti-reflection coating with graded refractive index structure

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摘要

The effective anti-reflection(AR)coating was designed a bi-layer graded refractive index structure with SiO2 and MgF2 thin films for polymer ophthalmic lens.The AR coatings were fabricated by electron beam vacuum evaporation process on polymer ophthalmic lenses.The AR effects have been investigated for different AR coating thickness.The mean reflectance of the AR coated polymer lens(25 nm MgF2/94 nm SiO2/blank polymer lens structure)was measured to 2.8 in the wavelength range of 400 nm to 800 nm,which was lower than that of the commercial five-layer AR coating(3.4).The refractive index of blank polymer lens was 1.56.The average reflectance of the non-AR coated bare polymer lens was measured to 5.6 in the wavelength range of 400 nm to 800 nm.As decrease of the MgF2 thickness,the mean transmittance is increased,and the photopic response is shifted from green spectrum band to violet spectrum band.

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