Optically Excited Quantum Dots (1 of 2) (IMAGE) Optica Caption Optically excited quantum dots in close proximity to a cell control the opening of ion channels. Credit Lugo et al., University of Washington Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.