Three-dimensional erasable optical recording in a single crystal of 1, 2-bis(3-methyl-2-thienyl)perfluorocyclopentene (
1), which shows a reversible fluorescence change with the photochromic reaction, has been demonstrated. The recorded spot size read by a fluorescence-detection method was approximately 200nm in plane and 1.5μm in depth, which corresponds to the recording density higher than 5Tbit/cm
3. The recorded spots were erased by irradiation with visible light. The writing/reading/erasing cycle could be repeated more than 10
4 times.
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