Fig. 4 | Scientific Reports

Fig. 4

From: A superior coherent perfect absorber and laser constructed from the periodic ring optical waveguide network based on extremum spontaneous PT-symmetric breaking points

Fig. 4

The distribution of photonic modes created by EM waves in the network presented in Fig. 1. The white and red zones represent WPM and SPM, i.e., weak propagation mode and strong propagation mode, respectively. (a) Frequency range corresponding to the thick red solid line in Fig. 3. (b) Enlarged drawing of the first extremum breaking point.

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