Fig. 1. Schematic of cross-polarization effects on PT-symmetric structure. (a) Cross polarization effect caused by Gaussian beam reflection in the +z(air-loss-gain-air) direction; (b) cross polarization effect caused by Gaussian beam reflection in the -z(air-gain-loss-air) direction; (c) rotation angle of the polarizer when a Gaussian beam is incident and reflected (inset: intensity distribution of incident light and cross-polarization component)

Fig. 2. Absolute values of two eigenvalues of the scattering matrix S versus the incident angle. (a) Evolution of eigenvalues of Gaussian beams propagating in the +z direction; (b) evolution of eigenvalues of Gaussian beams propagating in the -z direction

Fig. 3. Intensity distributions of each polarization component at different incident angles for horizontally polarized light beam propagating in the +z direction. (a)‒(c) Original polarization components; (e)‒(g) cross-polarization components; (d)(h) left-handed and right-handed circular polarization components

Fig. 4. Intensity distribution of each polarization component at different incident angles for horizontally polarized light beam propagating in the -z direction. (a)‒(c) Original polarization components; (e)‒(g) cross-polarization components; (d)(h) left-handed and right-handed circular polarization components

Fig. 5. A huge rotation of the cross-polarization component near the exceptional point at different incident angles. (a)‒(d) Beam propagates in the +z direction and the incident angle set to 69.5°; (e)‒(h) beam propagates in the -z direction and the incident angle set to 20.6°

Fig. 6. Relationship between the incident polarization angle and the rotation angle for different incident angles. (a) Light beam propagation along +z direction; (b) light beam propagation along -z direction

Fig. 7. Influence of the incident angle on intensity distribution of the reflected beam (zr=250 mm and xr=0). (a)(c) Original polarization components; (b)(d) cross-polarization components