Dynamical studies of the mechanisms for optical nonlinearities of methyl-red dye doped blue phase liquid crystals

Chun Wei Chen, Tsung Hsien Lin, Iam Choon Khoo

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Dynamical grating diffraction experiments and reflection/transmission polarization spectroscopy have been conducted on azo-dye doped Blue-Phase Liquid Crystal (BPLC) to investigate the mechanisms responsible for laser induced refractive index changes. The underlying mechanisms for the transient grating diffraction components are attributed to thermal indexing and lattice distortion, whereas the persistent component is due to lattice distortion/expansion caused by laser excited dye molecule isomerization. These mechanisms were distinguishable by their response dynamics and gave rise to the observed reflection spectra and photonic bandgap shift, polarization dependency and optical activity. Some preliminary studies have demonstrated the feasibility of using these mechanisms for coherent holographic and direct image writing operations.

Original languageEnglish (US)
Pages (from-to)21650-21656
Number of pages7
JournalOptics Express
Volume23
Issue number17
DOIs
StatePublished - Aug 24 2015

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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