Optically transparent and refractive index-tunable ZrO2/ photopolymer composites designed for ultraviolet nanoimprinting

Shimpei Kudo, Koichi Nagase, Shoichi Kubo, Okihiro Sugihara, Masaru Nakagawa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Epoxy-based, acrylate-based, and urethane-based ultraviolet (UV)-curable resins containing acrylate-modified zirconia nanoparticles (ZrO2-NPs) were prepared. UV-cured composite films fabricated using an acrylate-based resin and an epoxy-based resin exhibited a high transmittance >90% at visible and near-infrared wavelengths until the weight fraction of ZrO2-NPs having an average zirconia core diameter of 4.0nm reached 0.66. Their refractive indices at 633 nm were widely controllable between 1.515 and 1.659 for the acrylate-based composite films and between 1.589 and 1.679 for the epoxy-based composite films. Thin films of the UV-curable composite resins could be transformed by UV nanoimprinting in pentafluoropropane using a fluorinated silica mold. Among the composite resins, the acrylate-based UV-curable composite resins showed facile workability by UV nanoimprinting. The epoxy-based UV-curable composite resins formed pattern shapes independent of the weight fraction of ZrO2-NPs. These results indicated that the acrylate-based and epoxy-based composite films with optical transparency, refractive index controllability, and workability had potential as optical materials of optical devices and as resist materials for dry etching.

Original languageEnglish
Article number06GK12
JournalJapanese journal of applied physics
Issue number6 PART 2
Publication statusPublished - 2011 Jun

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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