Phys.org  November 16, 2021 Converting photon-based information to electron-based information are highly inefficient. To increase the efficiency of converting single photons into single electrons in gallium arsenide quantum dots an international team of researchers (Japan, Germany) designed a nanoantenna, consisting of ultra-small concentric rings of gold, to focus light onto a single quantum dot. It resulted in a voltage readout from their device enhancing photon absorption by a factor of up to 9. After illuminating a single quantum dot, most of the photogenerated electrons weren’t trapped there, instead accumulated in impurities or other locations in the device. Nevertheless, these excess […]