Enhanced photochemical-shift of reflection band from an inverse opal film based on larger birefringent polymer liquid crystals: Effect of tolane group on the photochemical shift behavior

Masaki Moritsugu, Tomomi Shirota, Shoichi Kubo, Tomonari Ogata, Osamu Sato, Seiji Kurihara

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Photo-chemically tunable photonic band gap materials are prepared by infiltration of liquid crystal polymers having azobenzene groups into voids of SiO2 inverse opal films. Linearly polarized (LP) light irradiation results in transformation from a random to an anisotropic molecular orientation of azobenzene side chains in the voids of the SiO2 inverse opal film, leading to the reversible and stable shift of the reflection peak to longer wavelength more than 15 nm. To improve switching properties, we use copolymers of azobenzene monomer and tolane monomer, which have higher birefringence, as infiltration materials into the voids. The azobenzenetolane copolymers are found to show higher birefringence than azobenzene homopolymers by the LP light irradiation at higher temperature. Consequently, the reflection band of the SiO2 inverse opal film infiltrated with the azobenzene-tolane copolymer can be shifted to longer wavelength region more than 55 nm by the irradiation of LP light.

Original languageEnglish
Pages (from-to)1981-1990
Number of pages10
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume47
Issue number20
DOIs
Publication statusPublished - 2009 Oct 15

Keywords

  • Azo polymers
  • Liquid-crystalline polymers (LCP)
  • Photochemistry

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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