They've already developed nanotube transmitters and receivers using graphene. New developments in nanotechnology may well produce a single device capable of converting the energy from radio wave photons into TeraHertz, infra red or visible light photons etc. Even solid state devices become more exotic as you demand higher and higher frequencies and circuit boards start take on the appearance of complex plumbing. There is no 'one technology fits all' that can produce photons of different frequencies (energies) across the entire spectrum. It turns out that the energy gap is just the right amount to give a visible light photon. Light emitting 'transmitters' (into optical devices) use electrons jumping from one energy level to another rather than using a 'tuned circuit'. If you crunch the numbers you will see that the photonic energy of a radiowave is millions of times smaller than that of a visible light photon. s) and f is the frequency of the photon.Where E = energy in joules, h = Planck' constant (6.626 × 10−34 J This energy can be calculated using the simple formula: E = hf and that difference is the energy the photon. In theory there is only one basic difference between a 'photon' of radio waves, light waves, far infra red waves, microwaves, ultra violet waves, x-rays etc.
At very high frequencies conventional capacitors and inductors are replaced by other devices (see resonant cavities) Use discrete inductors and capacitors at these frequencies? No. 300THz transmitter? (the band between infra red and microwaves) - with a lot of technology and know how perhaps.
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