Diffraction Measurement of Grating Structure Induced by Irradiation of Femtosecond Laser Pulse in Acrylate Block Copolymers
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概要
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Diffraction measurement was carried out for the evaluation of grating structures induced by irradiation of near-infrared (NIR) femtosecond laser pulse in block copolymers of methyl methacrylate and (ethyl acrylate and butyl acrylate) {p-(MMA/EA-BA) block copolymer}. Line irradiation, performed by scanning these copolymer bulks with a laser spot, produced the aggregated deposits of sub-micron scale. Stripe-shaped grating structures of approximately 3–5 $\mu$m width and approximately 30–220 $\mu$m thickness were induced at an interval of 7 to 15 $\mu$m. The total number of gratings was between 10 and 50. The grating structure obtained was evaluated by means of diffraction measurement. Raman–Nath type and Bragg type transmission diffraction patterns with diffraction efficiencies of approximately 1–13% and $Q$ values of approximately 0.1–9 were observed depending on the grating interval and thickness. Refractive index changes evaluated using the Bessel function were approximately $0.20{\mathendash}3.0\times 10^{-3}$. A Bragg type diffraction pattern was observed in the sample with a $Q$ value of approximately 9 and a refractive index change of $0.30\times 10^{-3}$ was obtained by optimization using the Robust design (Taguchi Method). Relative grating intensity linearly increased with increasing photo-crosslinker content in the acrylate block copolymer. Multiple scanning of line irradiation increased the refractive index from $0.30\times 10^{-3}$ for a single scan to $1.1\times 10^{-3}$ for three scans.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 2002-04-15
著者
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HIRAO Kazuyuki
Division of Material Chemistry, Faculty of Engineering, Kyoto University
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HORIIKE Mika
Core Technology Center, Nitto Denko Corporation
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Katayama Shigeru
Department Of Bioscience And Biotechnology Faculty Of Agriculture Shinshu University
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Tsutsumi Naoto
Department of Chemistry, Faculty of Science, Kyushu University 33
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