LCMRL

NCHU, Taiwan

The structure of Blue Phase I LC

(from Hiroyuki Yoshida)

Welcome

Liquid Crystal Materials Research Laboratory (LCMRL) was established at Department of Photonics, Feng Chia University in Taichung, Taiwan since 2007, and moved to Department of Physics, National Chung Hsing University. The main research topic is to study the electro-optic effects and physical properties of blue phase liquid crystal and cholesteric liquid crystal.

本實驗室成立於2007年08月1日,主要的研究方向與主題著重在膽固醇液晶與液晶藍相的電光效應與物理特性。歡迎有興趣的同學及老師蒞臨本實驗室參觀。

Our Research Highlight

Electrically tunable and reversible selective reflection due to the transition between simple cubic and tetragonal blue-phase liquid crystals

Liquid Crystals. Published Online: 2020/01/04

In this paper, we present experimental results on electrically tunable reflected wavelength in the full visible spectral range from 460 nm to 620 nm in one simple cubic blue-phase cell due to the simple-cubic–tetragonal lattice transition, confirmed by Kossel lines. The reflected wavelength is switched less than few hundreds milli-second and it is reversible. From the experimental observations in the reflection spectra and Kossel lines, we can see the following phenomena as increasing the applied field: the lattice-plane realignment in the simple-cubic blue phase (BPII), the transition between BPII and tetragonal blue-phase liquid crystal (BPX), and the lattice deformation of the BPX. Among them, the lattice deformation of the BPX shows larger electrostriction coefficient to shift the wavelength in a wider range, but it takes the longest response time. Because the reflected wavelength in each applied field exhibited extraordinarily sharp photonic bandgaps (less than 20 nm) with high reflectivity, the BP cell here shows a great potential to be a tunable photonic device.

Free copy:https://www.tandfonline.com/eprint/9AFNE9JWTYY9J9JS2PVF/full?target=10.1080/02678292.2019.1710868



A stable reflective state induced by a disturbed planar texture in surface- treatment-free chiral nematic liquid crystals

Optics Express, 29 (19), 30644-30654 (2021)


Chiral nematic liquid crystals possess a one-dimensional periodic helical structure and are one of the oldest known materials with the ability of selective reflection of light. Their helix orientation, determining their optical properties, can be changed by a variety of stimuli, and it is also dominated by the surface treatment, ratio of the elastic constants and cell thickness. Here, we present a simple method to realize an angular independence reflective state, induced by a stable disturbed planar texture, in a surface-treatment-free chiral nematic liquid crystal cell. The scattering state caused by the defect-rich focal-conic texture can be electrically tuned to the reflective state from the disturbed planar texture in a very short time, and vice versa. These two optical conditions are both stable states in the null field until the next trigger. We find that the disturbed planar texture in the chiral nematic can provide a 100viewing angle without reflected wavelength shift. The gray level of the reflected intensity can be tuned via application of the voltage pulses. Moreover, in this work, we discuss the effect of the chiral concentration on stabilizing the disturbed planar texture. When the chiral concentration is higher to induce the blue phases, the change in the texture of the ChNLCs after removing the strong electric field can stop at the disturbed planar texture with high reflectivity. In this work, the optical performance and the bistability based on the disturbed planar texture exhibits great potential for many applications, such as tunable filters, see-through/reflective displays and large-area smart windows.

全文下載:https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-29-19-30644&id=458530


Welcome to submit your paper to Special Issue of Symmetry features articles about LCs with chirality

https://www.mdpi.com/journal/symmetry/special_issues/Chirality_Liquid_Crystals


News

  • 2022.07 恭賀 實驗室獲得科技部工程光電學門補助三年期計畫 3,600,000元。

  • 2022.02 恭賀 王內均,蘇冠丞、李騏及蘇峻賢同學研討會論文被ILCC 2022接受 A easy method to form a single-domain liquid-crystal blue phase and its optical properties

  • 2022.02 恭賀 陳睿駿同學研討會論文被ILCC 2022接受 Growth of blue phase liquid crystals on nanoporous membranes

  • 2021.08 恭賀 期刊論文被接受 Hui-Yu Chen, Yu-Chuan Tsao, Chin-Ho Chang, and Jui Jiun Chen, "A stable reflective state induced by a disturbed planar texture in surface-treatment-free chiral nematic liquid crystals", Accepted by Optics Express 2021/08/26 (https://doi.org/10.1364/OE.438880

  • 2020.09 恭賀 李騏同學入選國際液晶學會(ILCS)2020年9 月特選液晶照片 Link

  • 2020.01 恭賀 期刊論文被接受 Hui-Yu Chen and Kuo-Cheng Hsu, "SElectrically tunable and reversible selective reflection due to the transition between simple cubic and tetragonal blue-phase liquid crystals, Liquid Crystals, Published Online 2020/01/03

  • 2019.11 恭賀 期刊論文被接受 Hui-Yu Chen and Yen-Wen Wang, "Symmetry Breaking Induced

Pockels Effect in a Tilted Field Switching BPIII Cell," Crystals 2019, 9(11), 598.

  • 2019.01 恭賀 期刊論文被接受 Hui-Yu Chen and Hao-Yu Tu "Optical polarization state of an IPS-BPII cell," Accepted by OSA Continuum.

  • 2018.07: 恭賀 本實驗室杜浩宇同學得科技部自然司物理學門補助研究生出席國際會議經費。

  • 2018.04: 恭賀 本實驗室王彥文,杜浩宇同學,論文獲2018 International Liquid Crystal Conference 接受,於2018/07在日本京都發表。

  • 2017.07 恭賀 實驗室獲得科技部自然司物理學門計畫補助1,140,000元。

  • 2017.04 恭賀 期刊論文刊登 Hui-Yu Chen, Sheng-Feng Lu, Pin-Hung Wu and Ching-Sheng Wang, " Transflective BPIII mode with no internal reflector," Liquid Crystals, 44:3, 473-478 (2017)

  • 2016.07: 恭賀 實驗室獲得科技部自然司物理學門計畫補助1,255,000元。

  • 2016.07: 恭賀 期刊論文接受 Hui-Yu Chen, Sheng-Feng Lu, Pin-Hung Wu and Ching-Sheng Wang, " Transflective BPIII mode with no internal reflector," Published online Liquid Crystals (2016/08).

  • 2016.03: 恭賀 期刊論文接受 Hui-Yu Chen, Che-Kai Wu, Fang-Chi Chen, and Chia-Sheng Chen, “Investigation on morphology of polymer structure in polymer-stabilized blue phase," Liquid Crystal, 43(10), 1351-1358 (2016)..

  • 2016.01: 恭賀 本實驗室兩篇論文獲2016 MRS Spring Meeting接受,於3/30在美國鳳凰城口頭發表。

  • 2015.07: 恭賀 碩士班學生 吳鑌紘、林子程獲科技部"研究生出席國際會議"補助,前往波蘭發表論文。

  • 2015.07: 恭賀 實驗室獲得科技部自然司物理學門計畫補助1,876,000元。

  • 2015. 06 : 恭賀 期刊論文接受 Hui-Yu Chen and Yi-Chun Hsieh, “Lattice structures in liquid-crystal blue phase with various chiral concentrations," Liquid Crystals, 42 (10), 1472-1477 (2015/06).

  • 2015. 05 : 恭賀 碩士班吳鑌紘及林子程同學論文被 OLC'15接受(海報發表)

  • 2014.12: 恭賀 期刊論文發表 Yi-Chun Hsieh, Sheng-Feng Lu, Yu-Jie Huang, and Hui-Yu Chen*, “Do the reflection colors of BPI depend linearly on chiral concentration?,” Molecular Crystal and Liquid Crystals 595(1), 63–69 (2014).

  • 2014.03 : 恭賀 碩士班謝宜君同學、陳芳琪同學論文被 ILCC'14接受(海報發表)

  • 2013.07 : 恭賀 本實驗室於Journal of Applied Physics 期刊發表之 "Fast Tunable Reflection in Amorphous Blue Phase III Liquid Crystal" 自2013年3月發表以來,下載次數達到138次

  • 2013.06 : 恭賀 碩士班陳芳琪同學論文被 OLC'13接受(口頭發表)

  • 2013.06 : 恭賀 碩士班謝宜君同學論文被 OLC'13接受並選為ICAM Graduate Student Workshop獎金(口頭發表)

  • 2013.06 : 恭賀 碩士班邱治豪同學、呂昇峰同學、陳佳陞同學論文被 OLC'13接受(海報發表)

  • 2013.03 : 恭賀 期刊論文發表 Hui-Yu Chen*, Sheng-Feng Lu, and Yi-Chun Hsieh, "Unusual electro-optical behavior in a wide-temperature BPIII cell," Optics Express , 21,9774 , 2013-04.

  • 2013.03 : 恭賀 期刊論文發表 Hui-Yu Chen*, Jia-Liang Lai, Chun-Cheng Chan, and Chih-Han Tseng, "Fast tunable reflection in amorphous blue phase III liquid crystal," Journal of Applied Physics , 113/13, 123103 , 2013-03

  • 2012.12 : 恭賀 學士班呂昇峰同學、張寧安同學、陳佳陞同學論文被 IDW'12接受(口頭發表)

  • 2012.08 : 恭賀 碩士班周冠翰、吳哲凱、曾志翰、邱治豪同學論文被 ILCC'12接受(海報發表)

  • 2012.05 : 恭賀 碩士班周冠翰同學論文被 SID'12接受(海報發表)

  • 2011.07 : 恭賀 碩士班賴佳良同學論文被 IDW'11接受(口頭發表)

  • 2011.07 : 恭賀 碩士班邱繼毅同學、陳泓瑋同學順利 通過碩士班口試

  • 2011.06 : 恭賀 本實驗室大三專題生 詹鈞証同學獲得 光電系期末專題海報發表 優等獎

  • 2011.04 : 2011SID Conference paper "Fast-Color-Switching Device in a Liquid-Crystal Blue-Phase Cell"被選為 "Best of the SID11 Symposium' (最佳論文)

  • 2010.11 : Hui-Yu Chen*, Hsin-Hung Liu, Jia-Liang Lai, and Ji-Yi Chou, "Relation between physical parameters and thermal stability of liquid-crystal

  • blue phase,"Applied Physics Letters , 97/18 , pp. 1919-1919 , 2010-11. (SCI)

  • 2010.10.01 : 賴佳良同學入選國際液晶學會(ILCS)2010年10月特選液晶照片 Link

  • 2010.06.01 : 邱治豪同學入選國際液晶學會(ILCS)2010年06月特選液晶照片 Link

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