Reflection-type confocal readout for multilayered optical memory

M. Ishikawa, Y. Kawata, C. Egami, O. Sugihara, N. Okamoto, M. Tsuchimori, O. Watanabe

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


We present a multilayered optical memory for use in reading data with a confocal reflection microscope system. We use a recording medium in which photosensitive thin films and nonphotosensitive transparent films are stacked alternately. Since the photosensitive films are thinner than the depth of focus of the recording beam, the spatial frequency distribution of the recorded bit data is extended in the axial direction. The extended distribution overlaps the coherent optical transfer function of the reflection-type confocal microscope. Urethane-urea copolymer film is used as a photosensitive material. The recording and reading of two layers are demonstrated.

Original languageEnglish
Pages (from-to)1781-1783
Number of pages3
JournalOptics Letters
Issue number22
Publication statusPublished - 1998 Nov 15
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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