The research team that announced the first optical rectenna in 2015 is now reporting a two-fold efficiency improvement in the devices – and a switch to air-stable diode materials. The improvements could allow the rectennas – which convert electromagnetic fields at optical frequencies directly to electrical current – to operate low-power devices such as temperature sensors.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/01/180126110033.htm
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