Described herein are improved capabilities for a source resonator having a Q-factor Q.sub.1>100 and a characteristic size x.sub.1 coupled to an energy source, and a second resonator having a Q-factor Q.sub.2>100 and a characteristic size x.sub.2 coupled to an energy drain located a distance D from the source resonator, where the source resonator and the second resonator are coupled to exchange energy wirelessly among the source resonator and the second resonator.