Electromagnetically induced transparency (IMAGE) Washington University in St. Louis Caption Electromagnetically induced transparency (EIT) is 'tuned' by two particles on the optical resonator. The different locations of particles control the propagation of light in either clockwise or counterclockwise directions, which switch on (upper configuration) or off (lower configuration) the interference of light, leading to controllable brightness (EIT) and darkness in the output. Credit Yang Lab Usage Restrictions Usage allowed with proper attribution 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.