A thermally tunable narrowband selector based on a chiral nematic containing a binary thermosensitive chiral dopant mixture

Zong Han Yang, Yu Cheng Hsiao, Dong Shen, Wei Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We employed a thermosensitive chiral dopant (CD), characterized by its thermoinduced change in helical twisting power (HTP) in terms of the handedness and strength, to shift the Bragg reflection band of a CLC. A thermally tunable photonic bandgap (PBG) device was demonstrated using a one-dimensional asymmetric photonic crystal (PC) infiltrated with the CLC as a defect layer. With a temperature controller to shift the PBG of the CLC, two narrow transmission bands can be tuned in the spectrum dominated by the asymmetric PC structure. This optical device can find applications as a tunable narrowband wavelength selector or an intensity controller.

Original languageEnglish
Pages (from-to)19-25
Number of pages7
JournalMolecular Crystals and Liquid Crystals
Volume644
Issue number1
DOIs
Publication statusPublished - Feb 11 2017
Externally publishedYes

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Keywords

  • Cholesteric liquid crystals
  • photonic crystals
  • thermosensitive chiral dopant

ASJC Scopus subject areas

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

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