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Ultra-fast switching blue phase liquid crystals diffraction grating stabilized by chiral monomer
Manda, Ramesh,Pagidi, Srinivas,Bhattacharya, Surjya Sarathi,Yoo, Hyesun,Kumar T, Arun,Lim, Young Jin,Lee, Seung Hee IOP 2018 Journal of Physics. D, Applied Physics Vol.51 No.18
<P>We have demonstrated an ultra-fast switching and efficient polymer stabilized blue phase liquid crystal (PS-BPLC) diffraction grating utilizing a chiral monomer. We have obtained a 0.5 ms response time by a novel polymer stabilization method which is three times faster than conventional PS-BPLC. In addition, the diffraction efficiency was improved 2% with a much wider phase range and the driving voltage to switch the device is reduced. The polarization properties of the diffracted beam are unaffected by this novel polymer stabilization. This device can be useful for future photonic applications.</P>
Pagidi, Srinivas,Manda, Ramesh,Bhattacharyya, Surjya Sarathi,Cho, Kyeong Jun,Kim, Tae Hyung,Lim, Young Jin,Lee, Seung Hee Elsevier 2019 Composites. Part B, Engineering Vol.164 No.-
<P><B>Abstract</B></P> <P>Nano-size distribution of birefringent liquid crystal droplets embedded in the polymer matrix gives rise to an optically isotropic liquid crystal (OILC) phase and the device utilizing OILC composite opens the possibility of alignment layer-free, flexible liquid crystal displays with fast response time. However, few critical issues such as high operating voltages and feeble light scattering are remained to be overcome before their widespread applications. To rectify the drawbacks, a small amount of conductive and anisotropic functionalized carbon nanotubes (f-CNTs) is doped into conventional OILCs. Consequently, switchable electro-optic properties of the proposed approach reveal that driving voltage is decreased by18.7%, response time becomes fast by 27%, and feeble light leakage is reduced to around 3.8 times, compared to conventional one, which helps the proposed approach to be competitive for display and photonic applications of film type of OILCs.</P>
김태형,김민수,Ramesh Manda,임영진,조경준,Han Hee,강재욱,이기동,이승희 한국광학회 2019 Current Optics and Photonics Vol.3 No.1
Application of liquid crystal (LC) materials to a flexible device is challenging because the bending of LC displays easily causes change in thickness of the LC layer and orientation of LCs, resulting in deterioration in a displayed image quality. In this work, we demonstrate a prototype device combining a flexible polymer substrate and an optically isotropic LC-polymer composite in which the device consists of interdigitated in-plane switching electrodes deposited on a flexible colorless polyimide substrate and the composite consisting of nano-sized LC droplets in a polymer matrix. The device can keep good electro-optic characteristics even when it is in a bending state because the LC orientation is not disturbed in both voltage-off and -on states. The proposed device shows a high potential to be applicable for future flexible LC devices.