Article
Optics
Esther Nabadda, Noureddine Bennis, Michal Czerwinski, Aleksandra Walewska, Leszek R. Jaroszewicz, Maria del Mar Sanchez-Lopez, Ignacio Moreno
Summary: In this work, a ferroelectric liquid crystal (FLC) modulator with a large switching rotation angle close to 90 degrees is fabricated and characterized. The modulator acts as a switchable wave-plate with an in-plane rotation of the principal axis under bipolar voltage. The device behaves as a binary pi phase modulator independently of the input state of polarization in the ideal situation of half-wave retardance. Physico-chemical properties of the liquid crystalline mixture used to fabricate the FLC modulator with such a large switching angle are provided. The device optical properties are characterized, and the polarization-independent pi phase shift is demonstrated using an adapted Young's type interferometer.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Seok-In Lim, Eunji Jang, Dongmin Yu, Jahyeon Koo, Dong-Gue Kang, Kyung Min Lee, Nicholas P. P. Godman, Michael E. E. McConney, Dae-Yoon Kim, Kwang-Un Jeong
Summary: This study fabricates wrinkled photonic crystal papers (PCPs) and demonstrates their consistent reflection of colors regardless of viewing angles. The results also show that changing the wrinkle direction can reduce the angular-dependent optical reflection. Additionally, a directionally independent 2D wavy-wrinkled PCP is developed.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Aleksandra Gridyakina, Natalia Kasian, Mi losz S. Chych Lowski, Marta Kajkowska, Piotr Lesiak
Summary: Multicomponent liquid crystal systems are of great interest in scientific research and practical applications. By combining liquid crystals, polymers, and nanoparticles into a three-component system, it is possible to optimize the performance in display applications and expand the applications of multicomponent systems.
MATERIALS TODAY PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Izabela Sliwa, Pavel V. Maslennikov, Alex V. Zakharov
Summary: This article describes the physical mechanism behind the appearance of traveling and nontraveling distortions in a microsized homogeneously aligned nematic film under the effect of a large electric field. Numerical studies reveal that the director's field may experience a traveling distortion wave in response to the electric field, with the rate of distortion depending on the magnitude of the applied field.
Article
Chemistry, Multidisciplinary
Atsushi Nakanishi, Shohei Hayashi, Hiroshi Satozono, Kazuue Fujita
Summary: In this study, polarization imaging of LCPs was conducted using a THz DFG source, which exhibit birefringence in the THz range due to the orientation of liquid crystal molecules, allowing for the determination of molecule alignment based on the direction of the optical axis.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Marta Kajkowska, Milosz Slawomir Chychlowski, Slawomir Ertman, Piotr Lesiak
Summary: This study demonstrates the first ever dual-period diffraction gratings that don't require electrical tuning to change the period. By selectively polymerizing a composite based on a nematic liquid crystal, the proposed elements allow for period manipulation by modifying the slits of the grating. The operating principle is based on changing the phase delay introduced by the slits depending on the polarization direction of incident light, allowing for period multiplication in the gratings.
Article
Optics
Yumeng Zhang, Qian Chen, Yao Gao, Jiangang Lu
Summary: A polarization-independent single-layer liquid crystal (LC) device is presented for achieving high optical phase retardation. By incorporating a single LC layer with twist angles of an integer multiple of 180 degrees, the device exhibits excellent polarization independence. The LC device with a single LC layer of 180 degrees twist angle can achieve the highest polarization-independent phase retardation when the polarization dependence is less than 15%. Additionally, it has a larger field of view compared to OCB and ECB modes, making it suitable for display, optical communication, and imaging systems.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Cheng-Kai Liu, Ming -Chi Liao, Chi-Tang Huang, Shao-Hao Liao, Ko -Ting Cheng
Summary: This paper demonstrates the detection of the polarization state of polarized light using azimuthally symmetric dye-doped liquid crystals (AS-DdLCs). Two methods are proposed, one involving image capture and analysis, and the other utilizing image comparison with a database. Techniques to improve detection accuracy and the comparison between the two methods are also discussed.
Article
Optics
Xinhao Jiang, Yunyun Ji, Fei Fan, Huijun Zhao, Songlin Jiang, Jierong Cheng, Maoqi Wu, John H. Xin, Shengjiang Chang
Summary: We demonstrate a dynamic terahertz chiral device by using anisotropic liquid crystals (LCs) sandwiched between a bilayer meta-surface. The device exhibits different optical responses under left- and right-circular polarized waves, reflecting its chirality. The coupling strengths of the modes can be tuned by the anisotropy of LCs, allowing for dynamic control of the circu-lar dichroism and polarization state of the device.
Article
Materials Science, Multidisciplinary
Taimoor Ali, Steve J. Elston, Jia-De Lin, Stephen M. Morris
Summary: A polarization controllable band-edge liquid crystal (LC) laser configuration that allows on-demand control of the laser's polarization state is presented. By manipulating the electric field and retardance, any desired polarization state can be achieved. However, achieving a pure linear polarization state is challenging. This tunable LC laser has potential applications in various fields such as biomedical and display industries.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Jingxin Sang, Wenbing Zhu, Yunfei Feng, Yang Liu, Jianhua Shang, Jiatong Sun, Lizheng Guo, Yihong Zhang, Shuguang Zhao, Vladimir Chigrinov, Dae-Shik Seo
Summary: Smart windows with a simple structure, large area preparation, and outstanding modulation ability are promising in energy saving in buildings and automobiles.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Osamu Oki, Chidambar Kulkarni, Hiroshi Yamagishi, Stefan C. J. Meskers, Zhan-Hong Lin, Jer-Shing Huang, E. W. Meijer, Yohei Yamamoto
Summary: This study demonstrates that conjugated polymers with chiral side chains can self-assemble into solid microspheres with a twisted bipolar interior, exhibiting high g(lum) CPL values in methanol. The microspheres can be handled with a microneedle for comprehensive examination of angular anisotropy, revealing that the CPL values in the equatorial plane are 2.5 times higher than those along the polar axis.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Moritsugu Sakamoto, Tomoki Yayama, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Hiroshi Ono
Summary: This study presents an optical system for efficient characterization of optical vortices with arbitrary states of polarization. By combining a straight-line polarization grating and parabolic-line polarization gratings, the system can accurately characterize the topological charge of incident optical vortices regardless of their polarization states.
APPLIED SCIENCES-BASEL
(2022)
Article
Physics, Fluids & Plasmas
A. Nych, R. Kravchuk, U. Ognysta, M. Ledney, O. Yaroshchuk
Summary: The study investigates the orientational configurations of thermotropic nematic liquid crystal in cylindrical capillaries with nondegenerated planar surface anchoring. By applying photoaligning coating on the inner wall of the capillary treated with UV light, different twisted structures can be achieved, from axial alignment with zero twist to 180 degrees-twisted configuration. Optical ray tracing calculations reveal the UV light intensity and polarization distribution over the inner capillary surface, providing valuable insights into liquid crystal behavior.
Review
Polymer Science
Yong Ye, Li Guo, Tingjun Zhong
Summary: Polymer-stabilized liquid crystals (PSLCs) are versatile materials with polymer networks providing anchoring energy for liquid crystals. This review details various improvements in PSLCs, including polymer-stabilized nematic, cholesteric, blue phase, smectic, ferroelectric, and antiferroelectric liquid crystals. PSLCs offer multiple functionalities, such as reorientation in smart windows and manual tuning of reflection bandwidth in broadband reflectors. PSBPLCs open up new possibilities for displays, modulators, sensors, lasers, lenses, and photonics applications. Polymer networks in PSFLCs or PSAFLCs enhance grayscale memories for flexible displays and energy-saving smart cards. The remaining challenges and research opportunities in PSLCs are also discussed.