Three-dimensional waveguides fabricated in poly(methyl methacrylate) by a femtosecond laser

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作者：
Watanabe, Wataru [1 ]
Sowa, Seiji [2 ]
Tamaki, Takayuki [2 ]
Itoh, Kazuyoshi [2 ]
Nishii, Junji [1 ]
机构：
[1] Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
[2] Department of Material and Life Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
来源：
Japanese Journal of Applied Physics, Part 2: Letters | 2006年 / 45卷 / 29-32期
关键词：
Three-dimensional waveguides are fabricated in poly(methyl methacrylate) (PMMA) by use of femtosecond pulses from a Ti:sapphire amplifier. Waveguides can be fabricated at depths of ∼1 mm inside a bulk PMMA; demonstrating the capability of micromachining in three-dimension. The realization of three-dimensional directional couplers is demonstrated. Observations of time-lapse cross-sectional images show the distribution of refractive index change gradually vary after irradiation of laser pulses. After the fabrication of the waveguide; refractive index in central region of the waveguide decreased. After 20 min; the symmetrical waveguide with positive refractive index change was formed. ©2006 The Japan Society of Applied Physics;
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