Templated Twist Structure Liquid Crystals and Photonic Applications

Abstract

Twist structure liquid crystals (TSLCs) have attracted increasing attention in photonic applications due to their distinct properties: Bragg reflection, scattering, and optical rotation. However, there exist some issues due to the defects of TSLCs: weak thermal stability, narrow bandwidth, and complicated fabrication. In this review, we introduce the templating technique which includes device structure, templating process, and photonic properties of templated TSLCs to improve the issues. Furthermore, a variety of photonic applications including lasing, optical filters and gratings based on TSLCs with polymer templates are presented. Additionally, other applications of TSLCs are briefly introduced. Finally, the remaining challenges and future perspectives of templated TSLCs are proposed.

Progress in Stability Adjustment of Photonic Crystal Coatings on Fabrics or Fiber: A Review

“…[8][9][10] Compared with chemical dyes, structural color has shown significant advantages, including bright colors, safety, environmentally friendly, fade-resistance, highly photochemical stability, and so on. 11,12 PCs are usually classified into three categories according to the difference in their orientation: one-dimensional (1D) PCs, 13 two-dimensional (2D) PCs, 14,15 and threedimensional (3D) PCs, 16 which are periodically ordered in the direction of one (see Figure 1(a)), two (see Figure 1(b)), and three (see Figure1(c)) dimensions, respectively. The 2D PCs (see Figure 1(b)) can quickly produce a photonic band gap in the visible range.…”

“…PCs are usually classified into three categories according to the difference in their orientation: one-dimensional (1D) PCs, 13 two-dimensional (2D) PCs, 14,15 and three-dimensional (3D) PCs, 16 which are periodically ordered in the direction of one (see Figure 1(a)), two (see Figure 1(b)), and three (see Figure1(c)) dimensions, respectively. The 2D PCs (see Figure 1(b)) can quickly produce a photonic band gap in the visible range.…”

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“…Liquid crystals (LCs) are intermediate substances between the liquid state and the solid state, referred to as the fourth state. The orientational ordering of LCs combined with the rod-like molecular shapes of LCs gives rise to intriguing physical anisotropies, which play essential roles in LC applications [1,2] . Generally, the orientational ordering of LCs can be controlled by different boundary geometries [3] and anchoring conditions [4] , allowing the formation of diverse structures or superstructures, including topological defects (i.e., focal conic domains [5] ).…”

Preparation of Cholesteric Polymer Networks with Narrow-Bandwidth Reflection and Memory Effect

“…The central reflection wavelength and bandwidth change under the action of the temperature, electromagnetic field, and stress. Therefore, CLCs have attracted significant interest in reflective liquid crystal displays [3][4][5], color filters [6][7][8][9][10],…”