Fine-scale interconnect with micro-air bridge

Structures of and methods for fabricating fine-scale interconnects are disclosed. A "mushroom"-type structure with a narrow stalk supporting a wider cap can be used for fine-scale interconnects with widths on the scale of hundreds of nanometers that have low resistivity. Micro-air bridges can be introduced by omitting the stalk in sections of the interconnect, allowing the interconnect to bridge over obstacles.