Electromagnetic Field Computers and Robots

As of today, I am not aware of any other writings on the subject, the subject of creating a computer or a robot from purely electromagnetic fields, that is, not from solid state material. Just as a radio wave is a purely electromagnetic form, so can these computers and robots be made from. An electromagnetic field structure, that is practically weightless, inhabiting nearly any space and goes though it and through barriers, can change shape and size, and can use energy available in space or provided to it. A giant leap in speed, efficiency and abilities compared to even today's most advanced computers and robots, a quantum leap that can and likely will propel technology, and even humanity to a different level.