Optical device

The invention provides an optical device which comprises a photoelectric conversion layer, an underlying layer, an anti-reflection layer and a plurality of composite units. The underlying layer is disposed on the photoelectric conversion layer. The anti-reflection layer is arranged on the underlying layer. The composite units are arranged above the photoelectric conversion layer, each of the plurality of composite units comprises a top part and a bottom part, and the projection of the bottom part on the photoelectric conversion layer is within the projection of the top part on the photoelectric conversion layer. The surface area of the top of each composite unit is larger than that of the bottom. The composite unit can provide better optical aberration and improve the imaging quality of the optical device. 本发明提供一种光学装置，其包含光电转换层、下伏层、抗反射层以及多个复合单元。下伏层设置于光电转换层上。抗反射层设置于下伏层上。复合单元设置于光电转换层上方，其中多个复合单元中的每一个包含顶部与底部，且底部于电转换层上的投影在顶部于光电转换层上的投影之内。每个复合单元的顶部的表面积大于底部的表面积。本发明的复合单元可以提供较佳的光学像差，并改善光学装置的成像品质。