Fig. 5: Demonstration of two CPA states in the quarter bow-tie billiard. | Nature Communications

Fig. 5: Demonstration of two CPA states in the quarter bow-tie billiard.

From: Perfect absorption in complex scattering systems with or without hidden symmetries

Fig. 5

A two-dimensional quarter bow-tie billiard (see inset) is used to test the CPA protocols. The red dot on the bow-tie represents the location of a point-like variable loss in the cavity. Through analysis of the S-matrix, two CPA states are found at the same system configuration. By injecting two different CPA waveforms, the measured ratios of output power Pout to input power Pin as a function of the microwave frequency are plotted together. The different incoming waveforms support two different CPA states with different CPA frequencies. The scale bar of the mean mode spacing Δ is shown in the plot as well.

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