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Femtosecond laser induced photoluminescence in poly(methyl methacrylate) and three-dimensional optical storage |
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| Authors: | Zhaogang Nie Ki-Soo Lim Myeongkyu Lee |
| Institution: | a Advanced Ultrafast Laser Research Center and Department of Engineering Science, Faculty of Informatics and Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan b BK21 Physics Program and Department of Physics, Chungbuk National University, Cheongju 361-763, Republic of Korea c Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea d International Cooperative Research Project, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan e Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan f Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan |
| Abstract: | We report on a femtosecond-laser induced photoluminescence (PL) in poly(methyl methacrylate) and its potential application to three-dimensional optical storage. Irradiation with a focused 800 nm, 1 kHz, 100 fs pulsed laser induced a strong PL change in UV-visible region. Absorption spectra and Fourier-transform infrared spectra before and after laser irradiation indicate the PL may result from the emissive oxidized products of photo-degradation reaction of PMMA. This makes it possible to read out the stored data by detecting the PL change. The pulse energy threshold of the light-induced PL change of PMMA is found to be at ∼2 μJ/pulse and the optimal recording energy is ∼3 μJ/pulse. A ten-layer pattern inside the bulk sample recorded by tightly focusing a pulsed laser beam was read out by a reflection-type fluorescent confocal microscope, which detected the emission in visible range as the signal. High-contract fluorescent images with a much higher signal-to-noise ratio were obtained without crosstalk in comparison with the ordinary reflection mode. |
| Keywords: | Three-dimensional optical storage Poly(methyl methacrylate) Femtosecond pulsed laser Photoluminescence |
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