Assuming these structures can be changed like an FPGA.
It’s not obvious how you can change the microstructure of a material to something you like in minutes.
It’s not obvious how you can change the microstructure of a material to something you like in minutes.
How about 3D micro-structures? It’s hard enough to make a one off 3D structure reproducible, never mind a changeable one.
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.