Smart Table Based on a Metasurface for Wireless Power Transfer

Cut the cord: Technology for wireless power transfer is important for conveniently charging electronic devices at a distance. Here metasurfaces are typically employed for wavefront shaping, to improve long-range wireless power transfer via far-field coupling. The authors present a ``smart table'' for wireless charging, with a metasurface incorporated as an intermediary between transmitter and receiver resonators, to substantially enhance the $n\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}r\ensuremath{-}f\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}d$ coupling. Power-transfer efficiency of over 80% is experimentally obtained, at distances up to 1 m between the resonators.