Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical Axis

Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical Axis

A layer of chiral liquid crystal (CLC) with a photonic bandgap in the visible range has excellent reflective properties. Recently, two director configurations have been proposed in the literature for CLC between two substrates with periodic photo-alignment: one with the director parallel to the subs...

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Main Authors: Migle Stebryte, Inge Nys, Yera Ye. Ussembayev, Jeroen Beeckman, Kristiaan Neyts
Format: Article
Language:English
Published: MDPI AG 2020-09-01
Series:Crystals
Subjects:
chiral liquid crytals
flat optics
full reflection band
diffraction
photonic band gap
Online Access:https://www.mdpi.com/2073-4352/10/9/807
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spelling doaj-76ac20393a614bdcac8dec52ab571ce32020-11-25T03:06:07ZengMDPI AGCrystals2073-43522020-09-011080780710.3390/cryst10090807Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical AxisMigle Stebryte0Inge Nys1Yera Ye. Ussembayev2Jeroen Beeckman3Kristiaan Neyts4Liquid Crystals and Photonics Group, ELIS Department, Ghent University, Technologiepark-Zwijnaarde 126, 9052 Ghent, BelgiumLiquid Crystals and Photonics Group, ELIS Department, Ghent University, Technologiepark-Zwijnaarde 126, 9052 Ghent, BelgiumLiquid Crystals and Photonics Group, ELIS Department, Ghent University, Technologiepark-Zwijnaarde 126, 9052 Ghent, BelgiumLiquid Crystals and Photonics Group, ELIS Department, Ghent University, Technologiepark-Zwijnaarde 126, 9052 Ghent, BelgiumLiquid Crystals and Photonics Group, ELIS Department, Ghent University, Technologiepark-Zwijnaarde 126, 9052 Ghent, BelgiumA layer of chiral liquid crystal (CLC) with a photonic bandgap in the visible range has excellent reflective properties. Recently, two director configurations have been proposed in the literature for CLC between two substrates with periodic photo-alignment: one with the director parallel to the substrates and one with the director in the bulk parallel to the tilted plane. The transmission experiments under large angles of incidence (AOI) presented in this work prove that, in the bulk, the director does not remain parallel with the substrates. Because of the inclined helical axis, the full reflection band can be observed at a smaller AOI than in planar CLC. For sufficiently large AOI, the reflection of diffracted light is prohibited by total internal reflection and efficient diffraction occurs in the forward direction.https://www.mdpi.com/2073-4352/10/9/807chiral liquid crytalsflat opticsfull reflection banddiffractionphotonic band gap
collection DOAJ
language English
format Article
sources DOAJ
author Migle Stebryte
Inge Nys
Yera Ye. Ussembayev
Jeroen Beeckman
Kristiaan Neyts
spellingShingle Migle Stebryte
Inge Nys
Yera Ye. Ussembayev
Jeroen Beeckman
Kristiaan Neyts
Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical Axis
Crystals
chiral liquid crytals
flat optics
full reflection band
diffraction
photonic band gap
author_facet Migle Stebryte
Inge Nys
Yera Ye. Ussembayev
Jeroen Beeckman
Kristiaan Neyts
author_sort Migle Stebryte
title Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical Axis
title_short Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical Axis
title_full Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical Axis
title_fullStr Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical Axis
title_full_unstemmed Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical Axis
title_sort large angle forward diffraction by chiral liquid crystal gratings with inclined helical axis
publisher MDPI AG
series Crystals
issn 2073-4352
publishDate 2020-09-01
description A layer of chiral liquid crystal (CLC) with a photonic bandgap in the visible range has excellent reflective properties. Recently, two director configurations have been proposed in the literature for CLC between two substrates with periodic photo-alignment: one with the director parallel to the substrates and one with the director in the bulk parallel to the tilted plane. The transmission experiments under large angles of incidence (AOI) presented in this work prove that, in the bulk, the director does not remain parallel with the substrates. Because of the inclined helical axis, the full reflection band can be observed at a smaller AOI than in planar CLC. For sufficiently large AOI, the reflection of diffracted light is prohibited by total internal reflection and efficient diffraction occurs in the forward direction.
topic chiral liquid crytals
flat optics
full reflection band
diffraction
photonic band gap
url https://www.mdpi.com/2073-4352/10/9/807
work_keys_str_mv AT miglestebryte largeangleforwarddiffractionbychiralliquidcrystalgratingswithinclinedhelicalaxis
AT ingenys largeangleforwarddiffractionbychiralliquidcrystalgratingswithinclinedhelicalaxis
AT yerayeussembayev largeangleforwarddiffractionbychiralliquidcrystalgratingswithinclinedhelicalaxis
AT jeroenbeeckman largeangleforwarddiffractionbychiralliquidcrystalgratingswithinclinedhelicalaxis
AT kristiaanneyts largeangleforwarddiffractionbychiralliquidcrystalgratingswithinclinedhelicalaxis
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