A Free-Space Optical Detector (image) The Optical Society Share Print E-Mail Caption Researchers developed a new way to capture and concentrate light for free-space optical communication. The fluorescent optical fibers absorb blue light coming from any direction over a large area and emit green light that travels inside the optical fiber until it reaches a very fast photodetector. Credit Tobias Tiecke, Facebook Inc. Usage Restrictions None 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.