Directional Emission of Photons (image) University of Copenhagen - Niels Bohr Institute Share Print E-Mail Caption This is a directional emission of photons. The figure shows the calculations of the photon emission in the new directional single-photon source. If the spin of the quantum dot's electron points up, the photon will be emitted in the one direction (blue). If the spin of the quantum dot's electron points down, the photon will be emitted in the opposite direction (red). Credit (Illustration: Sahand Mahmoodian and Søren Stobbe, NBI) Usage Restrictions (Illustration: Sahand Mahmoodian and Søren Stobbe, NBI) Share Print E-Mail 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.