Visible-laser ablation on a nanometer scale using urethane-urea copolymers

C. Egami, Y. Kawata, Y. Aoshima, H. Takeyama, F. Iwata, O. Sugihara, M. Tsuchimori, O. Watanabe, H. Fujimura, N. Okamoto

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


We report visible-laser ablation of a urethane-urea copolymer containing an azo dye. The ablated depth on the copolymer film was proportional to incident laser energy. The linearity of a depth/energy conversion on a nanometer scale was ensured at very low beam energy (∼ 2 J/cm2). Holographic grating formation was demonstrated as an example of application of this property. A sinusoidal grating with 40-nm amplitude was easily fabricated on the surface of the polymer film by introducing two coherent laser beams. The main mechanism of grating formation in the copolymer was not mass transport of copolymer chains due to pressure gradients but evaporation of the copolymer. Mass reduction associated with polymer evaporation was observed by means of the Quartz Crystal Microbalance (QCM) method.

Original languageEnglish
Pages (from-to)150-154
Number of pages5
JournalOptics Communications
Issue number1-6
Publication statusPublished - 1998 Dec 1


  • Azo polymer
  • Laser ablation
  • Optical storage media

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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