scholarly journals Photo-Embossed Surface Relief Structures with Improved Aspect Ratios and Their Applications in Liquid Crystal Devices

Polymers ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 171
Author(s):  
Xiulan Yang ◽  
Minzhao Gu ◽  
Qunmei Wei ◽  
Yang Zhang ◽  
Sihan Wu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Visible Light ◽  
Polymer Film ◽  
Surface Relief ◽  
Light Regulation ◽  
Complex Surface ◽  
Economical Method ◽  
Liquid Crystal Devices ◽  
Simple Strategy ◽  
Aspect Ratios

Photo-embossing has been developed as a convenient and economical method for creating complex surface relief structures in polymer films. The pursuit for large aspect ratios of the photo-embossed structures has never stopped. Here, we demonstrate a simple strategy to obtain improved aspect ratios by adding a quick solvent developing step into the photo-embossing process. A good solvent for the monomer is used to remove unreacted monomers from the unexposed region, resulting in deepened valleys of the surface reliefs. In a polymer film as thin as 2.5 µm, the height of the surface reliefs can be increased by a factor of three to around 1.0 µm. This strategy is also shown to be compatible with other methods used to improve the aspect ratios of the photo-embossed structures. Lastly, we employ these surface relief structures in the fabrication of liquid crystal (LC) devices and investigate their performances for visible light regulation.

scholarly journals Fabrication of switchable liquid crystal devices using surface relief gratings in photopolymer

2007 ◽  
Vol 20 (S1) ◽  
pp. 198-201 ◽  
Author(s):  
Pavani Kotakonda ◽  
Izabela Naydenova ◽  
Robert Howard ◽  
Suzanne Martin ◽  
Vincent Toal
Keyword(s):  
Liquid Crystal ◽  
Surface Relief ◽  
Liquid Crystal Devices ◽  
Surface Relief Gratings

In-plane bistable nematic liquid crystal devices based on nanoimprinted surface relief

2007 ◽  
Vol 91 (7) ◽  
pp. 073504 ◽  
Author(s):  
Jin Seog Gwag ◽  
Jun-ichi Fukuda ◽  
Makoto Yoneya ◽  
Hiroshi Yokoyama
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Surface Relief ◽  
Liquid Crystal Devices

Effect of the dielectric layer with photo-controllable surface relief on liquid crystal devices

2004 ◽  
Vol 24 (1-2) ◽  
pp. 53-56 ◽  
Author(s):  
Jae-Hong Park ◽  
Sung-Jin Kim ◽  
Min-Sik Jung ◽  
Sin-Doo Lee
Keyword(s):  
Liquid Crystal ◽  
Dielectric Layer ◽  
Surface Relief ◽  
Liquid Crystal Devices

A simple strategy for fabricating honeycomb patterns on commercially available polymer film under a wide humidity range

2020 ◽  
Vol 35 (23-24) ◽  
pp. 3210-3221
Author(s):  
Kai Huang ◽  
Qi Cheng ◽  
Honglei Zhang ◽  
Ligang Lin ◽  
Qiying Wang
Keyword(s):  
Polymer Film ◽  
Simple Strategy ◽  
Humidity Range

Abstract

scholarly journals Liquid Crystal Devices for Beam Steering Applications

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 247
Author(s):  
Rowan Morris ◽  
Cliff Jones ◽  
Mamatha Nagaraj
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Adaptive Optics ◽  
Beam Steering ◽  
Optical Components ◽  
Advantages And Disadvantages ◽  
Liquid Crystal Devices

Liquid crystals are valuable materials for applications in beam steering devices. In this paper, an overview of the use of liquid crystals in the field of adaptive optics specifically for beam steering and lensing devices is presented. The paper introduces the properties of liquid crystals that have made them useful in this field followed by a more detailed discussion of specific liquid crystal devices that act as switchable optical components of refractive and diffractive types. The relative advantages and disadvantages of the different devices and techniques are summarised.

scholarly journals Alignment Layer of Liquid Crystal Using Plant-Based Isoeugenol-Substituted Polystyrene

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 547
Author(s):  
DaEun Yang ◽  
Kyutae Seo ◽  
Hyo Kang
Keyword(s):  
Liquid Crystal ◽  
Surface Energy ◽  
Polymer Film ◽  
Uv Irradiation ◽  
Molar Content ◽  
Polymer Modification ◽  
Alignment Layer ◽  
Energy Value ◽  
Alignment System ◽  
Molar Percent

We synthesized a series of renewable and plant-based isoeugenol-substituted polystyrenes (PIEU#, # = 100, 80, 60, 40, and 20, where # is the molar percent content of isoeugenol moiety), using polymer modification reactions to study their liquid crystal (LC) alignment behavior. In general, the LC cells fabricated using polymer film with a higher molar content of isoeugenol side groups showed vertical LC alignment behavior. This alignment behavior was well related to the surface energy value of the polymer layer. For example, vertical alignments were observed when the polar surface energy value of the polymer was smaller than approximately 3.59 mJ/m2, generated by the nonpolar isoeugenol moiety with long and bulky carbon groups. Good alignment stability at 100 °C and under ultraviolet (UV) irradiation of 15 J/cm2 was observed for the LC cells fabricated using PIEU100 as a LC alignment layer. Therefore, renewable isoeugenol-based materials can be used to produce an eco-friendly vertical LC alignment system.

Visible-Light-Mediated Tandem Sulfonylation/Cyclization of Vinyl Azides with Sulfonyl Hydrazines for the Synthesis of 6-(Sulfonylmethyl)phenanthridines under Mild Conditions

Synlett ◽  
2019 ◽  
Vol 30 (08) ◽  
pp. 955-960 ◽  
Author(s):  
Liu-Liang Mao ◽  
Li-Xia Quan ◽  
Xian-Hong Zhu ◽  
Cong-Bin Ji ◽  
An-Xi Zhou ◽  
...  
Keyword(s):  
Visible Light ◽  
Mild Conditions ◽  
Simple Strategy ◽  
Vinyl Azides

A visible-light-mediated tandem sulfonylation/cyclization of vinyl azides with sulfonyl hydrazines was developed that provides an efficient and simple strategy for the synthesis of valuable 6-(sulfonylmethyl)phenanthridines with a broad substrate scope and satisfactory yields under mild conditions.

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