Pressure Induced Variations in Refractive Index of Aromatic Polyimide Film Analyzed by Brillouin Scattering

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  • Fujiwara Eisuke
    Department of Chemical Science and Engineering, Tokyo Institute of Technology
  • Ishige Ryohei
    Department of Chemical Science and Engineering, Tokyo Institute of Technology
  • Owaki Shota
    Department of Materials Science and Technology, Gifu University
  • Kita Naohiro
    Department of Materials Science and Technology, Gifu University
  • Yamada Kenta
    Department of Materials Science and Technology, Gifu University
  • Matsuoka Takahiro
    Department of Electrical, Electronic and Computer Engineering, Gifu University
  • Sasaki Shigeo
    Department of Electrical, Electronic and Computer Engineering, Gifu University
  • Ando Shinji
    Department of Chemical Science and Engineering, Tokyo Institute of Technology

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説明

Pressure-induced variations in refractive indices and acoustic velocities of a spin-coated aromatic polyimide (PI) film, poly(4,4’-oxidiphenylene pyromellitimide), were analyzed between atmospheric pressure (0.1 MPa) and 2 GPa by Brillouin scattering measurements with the symmetric platelet and the back scattering geometries for the film surface and the cross-sectional surface. At high pressures, anisotropies in acoustic velocity and refractive indices were clearly observed between the in-plane and out-of-plane directions. Additionally, the average refractive index of the PI film was estimated to increase from 1.682 to 1.80 by applying pressure up to 2 GPa due to the densification of aggregation structures of the PI film.

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