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Crystals 2017, 7(7), 184; doi:10.3390/cryst7070184

Photonic Bandgap–Cholesteric Device with Electrical Tunability and Optical Tristability in Its Defect Modes

1
Institute of Imaging and Biomedical Photonics, College of Photonics, National Chiao Tung University, Guiren District, Tainan 71150, Taiwan
2
Institute of Photonic System, College of Photonics, National Chiao Tung University, Guiren District, Tainan 71150, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Charles Rosenblatt
Received: 14 May 2017 / Revised: 15 June 2017 / Accepted: 20 June 2017 / Published: 23 June 2017
View Full-Text   |   Download PDF [1772 KB, uploaded 23 June 2017]   |  

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. View Full-Text
Keywords: photonic crystals; cholesteric liquid crystals; energy-efficient photonic devices photonic crystals; cholesteric liquid crystals; energy-efficient photonic devices
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Wu, P.-C.; Hsiao, C.-Y.; Lee, W. Photonic Bandgap–Cholesteric Device with Electrical Tunability and Optical Tristability in Its Defect Modes. Crystals 2017, 7, 184.

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