Optically induced birefringence in dye-doped blue phase liquid crystals

Fen Chi Lin, Hui Ying Kuo, Shuan Yu Huang, Tse Hsien Wu, Jia De Lin, Chia Rong Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper investigates the photoinduced change of refractive index in dye (methyl red, MR)-doped blue phase (DDBP) cells by illumination of a pump beam. Through excitation of light irradiation with proper photon energy, MR can transform from trans-state to cis-state and successively diffuse and anisotropically adsorb on the inner glass substrate of the DDBP cell along the direction perpendicular to the polarisation of the pump beam. The adsorbed MR molecules can effectively rotate the orientation of the liquid crystal (LC) molecules and thereby modulate the effective refractive index of the DDBP cell. The SEM images of the adsorbed regions of the illuminated DDBP samples were also taken for discussing the relation between the pump intensity and the photoinduced birefringence.

Original languageEnglish
Pages (from-to)913-919
Number of pages7
JournalLiquid Crystals
Volume46
Issue number6
DOIs
Publication statusPublished - 2019 May 3

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this