>How about 3D micro-structures? It’s hard enough to make a one off 3D structure reproducible
Well, there are 3D printers :)
Well, there are 3D printers :)
This is about optical wavelength length scales -> feature sizes << 1500nm for infrared
3D printers’ feature sizes work for giga hertz waves (as a guestimate) assuming:
- The features can be printed - 3D have limitations after all.
- the materials that can be 3D printed are optically suitable.