How Are Meta Materials Constructed?

meta materials, as I said, they do not exist in nature. For example, if I want to improve solar cells, right? So for this, I need to have highly absorbing material. And then depending on the structure, so there are different ways. The simplest is making alternating layers of these materials. There you use deposition techniques like sputtering or very high precision if you need a molecular beam may be taxing. You choose your technique depending on availability and ease it gives in making these structures.