Topological nature of multi-channel BICs (IMAGE) Science China Press Caption (a) Schematic view of the radiation channels of a multi-channel guided resonance. (b-d) Evolution of quality factors and polarization maps for different thickness. Credit ©Science China Press Usage Restrictions Use with credit. 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.