| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic material with a large absorption cross section which effectively absorbs two photons and sensitively realizes change of a spectrum, index of refraction or polarization, to provide a method for two-photon absorption optical recording and readout which enables readout by irradiating a recorded material with light and detecting the difference in emission intensity after recording is performed by an unrewritable method utilizing two-photon absorption of a two-photon absorption compound, to provide a two-photon absorption optical recording material capable of such the recording and readout, and further to provide a three-dimensional two-photon absorption optical recording material using the same and methods for optical recording and readout of the same. SOLUTION: The two-photon absorption material comprises a porphyrin derivative having four pyrrole rings that optionally have substituents and are bound to each other either directly or via carbon atoms optionally having substituents. Here, the total number of carbon atoms optionally having substituents linking the four pyrrole rings is four, and at least two of the pyrrole rings are directly bound to each other instead of via the carbon atom. COPYRIGHT: (C)2008,JPO&INPIT
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