Transient refractive index change behavior of poly(N-isopropylacrylamide) gels via laser induced photo-thermal conversion process

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  • Goto Takamichi
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Kato Jun
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Yamashita Takashi
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science

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Transient refractive index change of poly(N-isopropylacrylamide) gels (PNIPA gels) by the photo-thermal conversion were measured in water-ethanol mixture solvent. The magnitude of the refractive index change was as large as 10<sup)-3</sup>, and the response time was as small as 10 msec. The transient refractive index change is induced by the thermal expansion of the gels, while the magnitude of the refractive index change is not only affected by the thermal expansion of solvent, but also by the mobility of the solvent, which is restricted by the existence of polymer chain.

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