Rewritable Near-Field Optical Recording on Photochromic Perinaphthothioindigo Thin Films : Readout by Fluorescence

概要

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Near-field optical recording on polystyrene thin films containing photochromic perinaphthothioindigo (NTI) was carried out. NTI underwent a reversible trans/cis photoisomerization in the polystyrene film, and only the transform emitted fluorescence. First, polystyrene film containing transform NTI molecules was used as the recording medium. Upon irradiation with 633 nm light from a fiber probe tip (aperture diameter 〜 100 nm), the fluorescent trans-forms in a small region were converted into nonfluorescent cis-forms. The recorded small regions were detected as dark spots as small as 110 nm by scanning across the written area. Second, polystyrene film containing cis-form NTI molecules was used as the recording medium. Upon irradiation with ultrasmall 488 nm light (aperture diameter 〜 80 nm), bright spots as small as 50 nm were recorded and read out with scanning 633 nm light. The bright spots were due to the fluorescence of the photogenerated trans-form NTI molecules. Both the dark and bright spots were erased by irradiation with 488 nm and 633 nm light, respectively. The bright spot could also be recorded using a pulse Nd^<3+>: YAG laser (532 nm, pulse width 20 ns).
社団法人応用物理学会の論文
1999-10-15