<br><br><div><span class="gmail_quote">On 10/15/05, <b class="gmail_sendername">scerir</b> <<a href="mailto:scerir@libero.it">scerir@libero.it</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
What will be the next great invention on the order of the laser?<br>We don't know, but clever new ideas keep coming along.<br>The second-place award in the technological innovation competition<br>went to Marin Soljacic (MIT) for his concept of wireless, non-radiative
<br>energy transmission. Just as in the quantum case in which the<br>Schrodinger equation allows for a wave trapped in a box to tunnel<br>out, so Maxwell's equations allow for the leakage of electromagnetic<br>energy from an electromagnetic resonance object. If another such
<br>object were placed not far from the first one, and the resonant<br>frequencies of both were the same, then the energy could be<br>transferred between them with very little energy lost to other<br>objects in the nearby environmental that do not share the same
<br>resonant frequency. The transmitted energy, although<br>electromagnetic in nature, would not be referred to as "radiation"<br>since it is bound to the resonant objects. It is rather an example<br>of "near-field" physics. Soljacic avoids words like "antenna,"
<br>since the process does not involve broadcasts of energy in the usual<br>sense. In contrast, the vast majority of energy radiated by<br>antennas is typically wasted and lost into free space, while only a<br>small portion is picked up by the eventual receivers. Instead,
<br>Soljacic uses terms like "source" and "drain" in analogy with<br>transistors to describe the movement of energy. An exemplary setup<br>might consist of a transmitter in a ceiling and devices in that room
<br>(e.g robots, or computers) being powered wirelessly by this energy.<br><br>Marin Soljacic's page <a href="http://www.mit.edu/~soljacic/">http://www.mit.edu/~soljacic/</a><br><br></blockquote></div><br>
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<br>
Dirk<br>