Fig.2 (IMAGE) Science China Press Caption (left) Photo of a two-port topological insulator (TI) waveguide-resonator, yellow dotted lines indicate the boundaries of TI. (right) Experimental measured energy field distribution in critical coupling, incident waves in the resonator have not even one channel through which to flow out, now the resonator serves as a perfect energy absorber. Credit @Science China Press Usage Restrictions Use with credits License Licensed 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.