[extropy-chat] nonradiative energies
dirk.bruere at gmail.com
Sun Oct 16 01:45:19 UTC 2005
On 10/15/05, scerir <scerir at libero.it> wrote:
> What will be the next great invention on the order of the laser?
> We don't know, but clever new ideas keep coming along.
> The second-place award in the technological innovation competition
> went to Marin Soljacic (MIT) for his concept of wireless, non-radiative
> energy transmission. Just as in the quantum case in which the
> Schrodinger equation allows for a wave trapped in a box to tunnel
> out, so Maxwell's equations allow for the leakage of electromagnetic
> energy from an electromagnetic resonance object. If another such
> object were placed not far from the first one, and the resonant
> frequencies of both were the same, then the energy could be
> transferred between them with very little energy lost to other
> objects in the nearby environmental that do not share the same
> resonant frequency. The transmitted energy, although
> electromagnetic in nature, would not be referred to as "radiation"
> since it is bound to the resonant objects. It is rather an example
> of "near-field" physics. Soljacic avoids words like "antenna,"
> since the process does not involve broadcasts of energy in the usual
> sense. In contrast, the vast majority of energy radiated by
> antennas is typically wasted and lost into free space, while only a
> small portion is picked up by the eventual receivers. Instead,
> Soljacic uses terms like "source" and "drain" in analogy with
> transistors to describe the movement of energy. An exemplary setup
> might consist of a transmitter in a ceiling and devices in that room
> (e.g robots, or computers) being powered wirelessly by this energy.
> Marin Soljacic's page http://www.mit.edu/~soljacic/
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