| 摘要 |
FIELD: physics.SUBSTANCE: optical element has a base and a large number of structures lying on the surface of the base. The structures are protrusions or depressions and lie with spacing which is less than or equal to the wavelength of light under conditions of use. The effective refraction index in the direction of the depth of the structures gradually increases towards the base, and the curve of the effective refraction index has two more points of inflexion. The structures can be arranged in form of a hexagonal array, a quasi-hexagonal array, a quadrilateral array or a quasi-quadrilateral array. The structures have two or more steps between the peak and the bottom part of the structures and have a peak and/or a bottom part; or the structures have a curvilinear surface and become wider from the peak to the bottom part; or change in the effective refraction index in the direction of the depth of the structures on the upper side of the structures is greater than the average value of the effective refraction index on the slope of the structure; or change in effective refraction index in the direction of the depth of the structures on the side of the base of the structures is greater than the average value of the effective refraction index on the slop of the structure.EFFECT: improved antireflection properties of optical elements.30 cl, 93 dwg |
