Figure 2:

Polarizabilities and scattering cross-sections. (a) Polarizabilities of particle 1 and particle 2 indicated by red and blue lines, respectively, where the solid lines refer to left-to-right (positive z-direction) excitation, and dashed lines refer to right-to-left (negative z-direction) excitations. (b) Total scattering cross-section (SCS). Large nonreciprocity is observed at the frequency of 178.34 THz: minimum scattering for left-to-right excitation and maximum scattering for right-to-left excitation. The total scattering cross-section is normalized by the geometric cross-section of the largest particle.