Multilayered optical bit memory with a high signal-to-noise ratio in fluorescent polymethylmethacrylate

Zhaogang Nie; Heungyeol Lee; Hyeonggeun Yoo; Youlee Lee; Younshil Kim; Ki-Soo Lim; Myeongkyu Lee
March 2009
Applied Physics Letters;3/16/2009, Vol. 94 Issue 11, p111912
Academic Journal
We report on the three-dimensional optical memory utilizing a photoluminescence (PL) change in polymethylmethacrylate. Irradiation with a femtosecond pulsed laser (800 nm, 1 kHz, 100 fs) induced a strong PL spectrum in the visible range, which may result from the photogeneration of emissive radicals. Multilayered patterns were recorded inside the bulk sample by tightly focusing a pulsed laser beam. The pattern images were read out by a reflection-type fluorescent confocal microscope which detected the blue-green emission at 410–510 nm. The stored bits were retrieved with a high signal-to-noise ratio in the absence of any cross-talk.


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