Optical element and optical apparatus

光学元件和光学装置

Abstract

一种光学元件从光入射侧依次包含第一层(012)、第二层(013)和基体构件(011)。第一层包含具有以比入射光的波长小的节距交替地形成的凸形部分(012a)和凹形部分(012b)的凹凸结构,并且,第二层满足以下的条件:这里,ns表示第一层的有效折射率,nb表示基体构件的折射率,并且,nA和dA分别表示第二层的折射率和厚度。
The optical element includes in order from a light-entering side, a first layer (012), a second layer (013), and a base member (011). The first layer includes a concavo-convex structure with convex portions (012a) and concave portions (012b) alternately formed at a pitch smaller than a wavelength of entering light, and the second layer satisfies the following conditions: where ns represents an effective refractive index of the first layer, nb represents a refractive index of the base member, and nA and dA respectively represent a refractive index and a thickness of the second layer.

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