Figure 4
Spectra of the Bloch wave and the wave vector diagram along ΓM direction in case 1. (a) Spectra of the Bloch wave. The insets show phase evolutions of harmonics, in which the black line indicates the retrieved electrical field at one time, while the green line and red line indicate the fields of previous time and later time. (b) In reciprocal unit cells, the black arrows and pink arrows indicate the directions of Poynting vectors \(\vec{S}\) and wave vectors \(\vec{{K}_{m}}\) of each excited plane wave correspondingly. The red arrows indicate the correct exiting directions of refracted waves, i.e., OA and OC for case 1, OE for ref.4. The blue line shows the direction of incident wave from air.
