Fig. 2: Simulation results of the EP pair with the mirror-symmetric structures. | Nature Communications

Fig. 2: Simulation results of the EP pair with the mirror-symmetric structures.

From: Creating pairs of exceptional points for arbitrary polarization control: asymmetric vectorial wavefront modulation

Fig. 2

a Spectral dependence of the reflection coefficients in the CP basis. Two zero-reflectivity singularity points with \({M}_{{LR}}={M}_{{RL}}^{m}=0\) are observed at \(\lambda\) = 600 nm. b, c The eigenstates of (b) meta-structures \(S\) and (c) \({S}^{m}\) projected on the Poincaré sphere as a function of wavelength, showing that they degenerate at the two poles (RCP and LCP) at \(\lambda\) = 600 nm, where Es1 and Es2 represent eigenstate 1 and eigenstate 2. d–g Eigenstates of the reflection matrices in parameter space (\({L}_{1}\), \({L}_{3}\)) at a wavelength of 600 nm. d Azimuth and e ellipticity angles of the eigenstate 1. f Azimuth and g ellipticity angles of the eigenstate 2. The parameter space is set to \({L}_{1}\in\)[−100, 100 nm] and \({L}_{3}\in\)[50, 250 nm], where white and black stars represent EPs in meta-structures \(S\) and \({S}^{m}\), respectively.

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