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Applied Optics

Applied Optics


  • Vol. 37, Iss. 20 — Jul. 10, 1998
  • pp: 4419–4424

Fluorescence readout of near-field photochromic memory

Tsuyoshi Tsujioka and Masahiro Irie  »View Author Affiliations

Applied Optics, Vol. 37, Issue 20, pp. 4419-4424 (1998)

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The fluorescence- and transmittance-detection readout methods of a near-field photochromic optical memory by a scanning-probe technique were studied theoretically. Shot noise, as the principal noise, was taken into account in an analysis of the signal-to-noise ratio (SNR). Under most conditions, fluorescence-detection readout yielded a better SNR than did transmittance-detection readout. For a transmittance change of 0.9–1.0 as a result of recording, a readout light power of approximately 100 nW, and a system bandwidth of 1 MHz, only the fluorescence-detection readout method, under the condition that the fluorescent layer of the medium have a fluorescence quantum yield greater than 0.4, can produce a sufficiently large SNR.

© 1998 Optical Society of America

OCIS Codes
(210.0210) Optical data storage : Optical data storage
(210.4680) Optical data storage : Optical memories
(210.4770) Optical data storage : Optical recording
(260.2510) Physical optics : Fluorescence

Original Manuscript: October 28, 1997
Revised Manuscript: March 30, 1998
Published: July 10, 1998

Tsuyoshi Tsujioka and Masahiro Irie, "Fluorescence readout of near-field photochromic memory," Appl. Opt. 37, 4419-4424 (1998)

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