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A previous work, ref. 2 experimentally confirmed that measured specialpolarization characteristic features of a three-dimensional terahertz (THz)photonic-crystal did not apparently apply to general physical- and optical-basic rules. It is said that three-dimensional (3D) photonic crystals (PC) haveno polarization anisotropy within photonic band gap (PBG, stop gap, stop band)of high symmetry points in normal incidence. None the less because twodirections at right angles to each other on the plane (001) areconstitutionally and optically identical in appearance, the polarizationorientation of a reflected wave rotated by 90 degrees from that of an incidentwave at a frequency within the PBG when that of the incident wave was thedirection that bisects these two directions. The 3D-PC is a silicon inversediamond structure whose lattice point shape is vacant regular octahedrons. Inthis work, the phase-difference, size and orientation of electric-field of thereflected wave, had been studied by using a FEM (finite element method). Theanalyses indicated the reason why the polarization orientation of the reflectedwave is rotated by 90 degrees at the frequency within the PBG. In addition, itwas found that the orbit of electric-field of the reflected wave becomesnear-circularly-polarized one at another frequency within the PBG for thelinear-polarization incident wave.

Special polarization characteristic features of a three-dimensional  terahertz photonic crystal quantitatively evaluated by phase-differences with  a FEM