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

被引:19
|
作者
Stebryte, Migle [1 ]
Nys, Inge [1 ]
Ussembayev, Yera Ye. [1 ]
Beeckman, Jeroen [1 ]
Neyts, Kristiaan [1 ]
机构
[1] Univ Ghent, ELIS Dept, Liquid Crystals & Photon Grp, Technol Pk Zwijnaarde 126, B-9052 Ghent, Belgium
来源
CRYSTALS | 2020年 / 10卷 / 09期
关键词
chiral liquid crytals; flat optics; full reflection band; diffraction; photonic band gap; OPTICAL-PROPERTIES; REFLECTION;
D O I
10.3390/cryst10090807
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
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.
引用
收藏
页码:1 / 14
页数:14
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