the polarization decreases but still stay positive.

Further increasing the magnitude of negative electric fields up to $\simeq$ -0.094 $\times$ 10$^9$ V/m results in drastic changes for the microstructure: dipoles in the medium now adopt negative $z$-components (state 3), then sites at the interfaces between the medium and the wires also flip the sign of the $z$-component of their dipoles (states 3 and $\alpha$). During these changes, the overall polarization rapidly varies from a significant positive value along the $z$-axis to a slightly negative value (Fig. 2b), while G$_z$ is nearly constant, therefore rendering the gyrotropic coefficients null. Then, continually increasing the strength of the negative $ac$ field up to $\simeq$ -0.48 $\times$ 10$^9$ V/m leads to the next stage: dipoles [*inside*]{} the wires begin to change the sign of their $z$-components (states $\beta$, 4 and $\gamma$) until all of the $z$-components of these dipoles point down (state 5). During that process, P$_z$ becomes more and more negative, while the electrical toroidal moment decreases very fast but remains positive (indicating that the chirality of the wires is unaffected by the switching of the overall polarization).

Once this process is completed, further increasing the magnitude of the applied field along \[00$\bar{1}$\] 