Nanoparticle illustration (IMAGE) Australian National University Caption An illustration showing a single nanoparticle converting low-frequency red light into extreme-ultraviolet light, which has a very high frequency. Credit Image credit: Anastasiia Zalogina/ANU Usage Restrictions Must credit Anastasiia Zalogina/ANU License Original 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.