There are actually in essence two attainable good reasons for the helpful refractive index variation on light-weight irradiation: heating of the LiNbO3:Fe substrates and, consequently, of the LC inside the microchannel, and director reorientation in the electrical area induced by light inside the LiNbO3:Fe substrates. A non-centrosymmetric distortion then success https://lithium-niobate-crystal13467.tkzblog.com/32350072/an-unbiased-view-of-lithium-niobate-crystal