Precise Lens-On-Lens Architecture Using Selective Wettability for Image-Depth Representation

We demonstrate a precise lens-on-lens architecture using the concept of the selective wettability for the image-depth representation. Two focal lengths realized by the difference between two geometrical curvatures of the primary convex lens and the secondary convex lens in a lens-on-lens manner enable to produce two image planes. Such lens architecture was spontaneously produced through the selective wetting process of a photo-reactive polymer during dip-coating, followed by the irradiation of ultraviolet light for polymerization. Our selective wettability approach is capable of building various sizes and shapes of the lens-on-lens patterns over large-area without using a photo-lithography or a wet-chemical etching process.