CIPS/OSA Brown Bag Seminar Series

Thursday, October 16, 2008

12 noon , RLE Haus Conference Room 36-428

Mid-range efficient Wireless Energy-Transfer

Aristeidis Karalis

A condition of 'strong coupling' of resonances is identified as necessary and sufficient for efficient energy-exchange between two resonant systems. Carefully-designed high-Q subwavelength electromagnetic resonances, coupled wirelessly via their near fields, are shown to satisfy this condition at mid-range distances both theoretically and experimentally, in the latter case by powering a 60W light-bulb wirelessly across a 2m-distance using two 60cm-diameter resonant objects and with 45% efficiency. A technique for further efficiency enhancement and radiation suppression is suggested, based on employing destructive interference between the coupled-objects' radiated far-fields. Applications of the proposed wireless-powering method can be found in both the macro- and micro-worlds, and range among industrial, medical, consumer and more.