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Photon induced electric field poling
In physics, photon induced electric field poling is a phenomenon whereby a pattern of local electric field orientations can be encoded in a suitable ferroelectric material, such as perovskite. The resulting encoded material is conceptually similar to the pattern of magnetic field orientations within the magnetic domains of a ferromagnet, and thus may be considered as a possible technology for computer storage media. The encoded regions are optically active (have a varying index of refraction) and thus may be "read out" optically.
==Encoding process==
The encoding process proceeds by application of ultraviolet light tuned to the absorption band associated with the transition of electrons from the valence band to the conduction band. During UV application, an external electric field is used to modify the electric dipole moment of regions of the ferroelectric material that are exposed to UV light. By this process, a pattern of local electric field orientations can be encoded.
Technically, the encoding effect proceeds by the creation of a population inversion between the valence and conduction bands, with the resulting creation of plasmons. During this time, ferroelectric perovskite materials can be forced to change geometry by the application of an electric field. The encoded regions become optically active due to the Pockels effect.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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