Fig. 3: Complex zeros dependence on the input power for different coupling strength.
From: Non-linear coherent perfect absorption in the proximity of exceptional points
Trajectories (red and blue solid lines) of the complex zeros ω of the scattering matrix as a function of input power. The dashed and dotted lines are projections of these trajectories on the corresponding plane. The non-linearity Ω = β0 + β1∣ψ0∣2 with β0 = (67.74 + 3.00i) × 10−3 GHz β1 = (− 0.141 + 0.410i) × 10−3 GHz mW−1. a For two weakly coupled antennas of relative coupling strength κ/ν = 0.23, where ν is the coupling strength inside the semi-infinite leads and κ the coupling strength to the non-linear resonator. b For two intermediately coupled antennas of κ/ν = 0.40. c For two perfectly coupled antennas κ/ν = 1. d As bottom left but the real part of the non-linearity is set zero, i.e., no real frequency shift. The absorbance A is reported as a density plot versus the frequency ω and the power PVNA injected by the vector network analyzer (VNA) using the same color scale is in Fig. 2.
