Abstract
The signal-to-noise ratio (SNR) on the fluorescence readout of
a near-field photochromic memory was theoretically studied. Under
various conditions the shot-noise-limited SNR was analyzed. SNR by
bright spot recording (BSR) that was better than that by dark spot
recording (DSR) was obtained under the condition of low writing
power or wide bandwidth. Under the condition of bandwidth
W = 1 MHz and P
write =
10-8 W only BSR can attain sufficiently high SNR, and the
SNR was greater by as much as 30 dB than that of DSR. It was
concluded that BSR is a promising method for high-density near-field
photochromic memory with a fluorescence readout.
© 1999 Optical Society of America
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