BULK PHOTOVOLTAIC EFFECT IN GYROTROPIC CRYSTALS

The effect of optical activity on the linear and circular bulk photovoltaic effect in crystals without a center of symmetry is investigated. It is shown that there is a phase shift of the linear photovoltaic current J, which is opposite for the right and left crystals, and a modulus change. The circular photovoltaic current J does not change in phase depending on the amount of optical activity, but depends on absorption and circular dichroism. The dependences of the J current on the polarization of incident light are calculated, taking into account the optical activity for the right and left crystals BiSiO, BiGeO and BiTiO (class 23). Similar J calculations were performed for the right crystals PbGeO (class 3), LaGaSiO with impurities of Pr, Fe, Cr and Mn, CaTaGaSiO (class 32), Er(HCOO)·2HO (class 222) when light propagates in the direction of the optical axis. Examples of the JC value for PbGeO, LaGaSiO crystals with impurities of Co, Cr, and Fe, as well as α-HgS (class 32), are given. It is shown that consideration of optical activity is necessary when studying the photorefractive effect in crystals.