Photonic bandgap–cholesteric device with electrical tunability and optical tristability in its defect modes

Po Chang Wu, Chih Yuan Hsiao, Wei Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

This study proposes a hybrid structure for a one-dimensional (1D) photonic crystal (PC) comprising a tristable cholesteric liquid crystal (CLC) as the defect layer. The CLC exhibits three optically stable states: the Grandjean planar (P), focal conic (FC), and uniform lying helix (ULH) configurations. Specifically, the reflection band of the CLC is set within the photonic bandgap (PBG) of the 1D PC. While the ULH and the FC states can be regarded as the light-on and light-off states for defect-mode peaks in the visible spectrum, respectively, switching the device from the ULH to the P state enables suppression of the transmission of partial defect modes within the PBG. This device possesses many alluring features, such as optical tristability at null applied voltage and transmission tunability of the defect modes, providing a new pathway for the design of multifunctional and energy-efficient optical switches, light shutters, multichannels, and wavelength selectors.

Original languageEnglish
Article number184
JournalCrystals
Volume7
Issue number7
DOIs
StatePublished - 1 Jul 2017

Keywords

  • Cholesteric liquid crystals
  • Energy-efficient photonic devices
  • Photonic crystals

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