Focus issue introduction: liquid crystal materials for photonic applications

Lee, Wei; Wu, Shin‐Tson

doi:10.1364/ome.1.001585

Cited by 9 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The periodicity of these patterns can be in the micrometer range and comparable with the optical wavelengths. Thus, they may serve as optical gratings, and investigations on the formation of such microstructures have attracted considerable interest in the field of optics [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Light-Controllable Electroconvection Patterns in a Chiral Nematic Liquid Crystal

Jing

Xiang

et al. 2018

Phys. Rev. Applied

View full text Add to dashboard Cite

The influence of UV light-induced pitch contraction and dilation on the electroconvection patterns (ECPs) of a chiral nematic liquid crystal containing a photoresponsive chiral dopant is investigated in planar-aligned cells. It is observed that the helical twisting power of the dopant changes (even undergoes handedness inversion) under UV irradiation; consequently, the pitch and the direction of the convection rolls in ECPs (being either parallel with or perpendicular to the surface alignment) could be controlled by the UV intensity and the ac voltage. In contrast to traditional methods, where the pitch is modulated by electric or thermal fields, our method of applying a light field allows a remote and contactless manipulation of the pitch, which is easily detectable via the morphological changes of ECPs. The ability to control the orientation of ECPs by tuning the light intensity can conveniently be utilized as an optical grating, allowing switchable, dual-mode operation.

show abstract

Section: Introductionmentioning

confidence: 99%

Light-Controllable Electroconvection Patterns in a Chiral Nematic Liquid Crystal

Jing

Xiang

et al. 2018

Phys. Rev. Applied

View full text Add to dashboard Cite

show abstract

“…In these displays, the shortest wavelength is 450 nm from the blue LED [10,11]. Many photonic applications operate in the infrared region [12]. It seems that the photostability of high-Δn LCs for above applications should be forgiven.…”

Section: Introductionmentioning

confidence: 99%

Improving UV stability of tolane-liquid crystals in photonic applications by the ortho fluorine substitution

Chen

Wang

Chen

et al. 2015

Opt. Mater. Express

View full text Add to dashboard Cite

A series of ortho fluoro-tolane liquid crystals was prepared via multi-step reactions based on 4-alkylcyclohexanecarboxylic acids. Their synthetic routes, thermotropic mesophases and UV stability properties are discussed by comparision with the non-fluorinated analogs. All of the measurements from DSC, UV-vis absorption and fluorescence emission spectra demonstrate that the presence of ortho fluorine can significantly improve the UV stability of tolane-liquid crystals. Meanwhile, the ultimate failure mechanism of tolane-LCs during UV exposure is deduced by a photochemical reaction. DFT calculations of molecular polarizabilities, triple bond lengths, electrostatic potential maps and molecular orbitals are used to correlate the experimental findings. The interaction mechanism for stabilization of the tolane structures by the ortho fluoro substitution is also explained. This work may provide an effective solution for the obstacle existed in tolane-liquid crystals and pave a way for their applications in liquid crystal photonics. , "A highly selective synthesis of diarylethynes and their oligomers by a palladium-catalyzed Sonogashira coupling reaction under phase transfer conditions," J. Org.

show abstract

“…Such defect modes, though tunable, are often persistent due to the permanent existence of the defect layer. Recently, chiral mesogens like cholesteric LCs (CLCs) [10,11] have received much attention as self-organized PCs. CLCs possess molecular chirality and form helical structures spontaneously.…”

Section: Introductionmentioning

confidence: 99%

Thermodielectric generation of defect modes in a photonic liquid crystal

Hsiao¹,

Wang²,

Lee³

2014

Opt. Express

Self Cite

View full text Add to dashboard Cite

Photonic defect modes induced by in situ formation of an ill-defined defect layer is demonstrated in a cholesteric liquid crystal (CLC). The local deformation of the one-dimensionally periodic helical structure is achieved by means of the thermodielectric effect, which alters the pitch in the middle of the cholesteric structure. The defect-mode peak in the photonic band gap appears in the transmission spectrum only when the incident circularly polarized light has the same handedness as that of the CLC structure. The wavelength of the deformation-induced defect mode can be tuned upon varying the dielectric heating power by simply applying a frequency-modulated voltage.

show abstract

Focus issue introduction: liquid crystal materials for photonic applications

Cited by 9 publications

References 15 publications

Light-Controllable Electroconvection Patterns in a Chiral Nematic Liquid Crystal

Light-Controllable Electroconvection Patterns in a Chiral Nematic Liquid Crystal

Improving UV stability of tolane-liquid crystals in photonic applications by the ortho fluorine substitution

Thermodielectric generation of defect modes in a photonic liquid crystal

Contact Info

Product

Resources

About