Optical setup (IMAGE) Optica Caption Meng Xiong and Frederik Schröder of the research team are shown with the scattering scanning near-field optical microscope used to demonstrate the spatial light confinement of the new nanocavities. Nanocavities with ultrasmall mode volumes could help improve a wide range of photonic devices and technologies. Credit Meng Xiong, Technical University of Denmark Usage Restrictions None 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.