Article
Materials Science, Multidisciplinary
Lotfi Saadaoui, Ridha Hamdi
Summary: This study investigated the pattern formation in planar-oriented Cholesteric Liquid Crystals (CLC) for various thicknesses to pitch (d/p) ratios, as well as the features of the director's fields and defects lines. Experimental results showed that the dynamic formation of grating stripes varied for different d/p ratios, with differences in stripe orientation and contrast evolution.
Article
Chemistry, Physical
Yi-Cheng Chang, Sheng-Hsiung Yang, Victor Ya. Zyryanov, Wei Lee
Summary: We have demonstrated a cholesteric liquid crystal (CLC) smart window that can switch between transparent and low-transmission states reversibly based on thermo-optic effect. This smart window utilizes a thermoresponsive handedness-reversible chiral dopant in a mixture of chiral dopant, dichroic dye and nematic liquid crystal to create a thermosensitized CLC. By increasing the temperature, the device switches from a homeotropic texture to a fingerprint texture. The absorption characteristic of the dichroic dye enables the CLC to have two distinct transmission levels.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Ahmad M. Labeeb, Yassmin A. Ward, Mohamed Fikry
Summary: This research article focuses on tunable photonic optical bandgap materials and devices based on cholesteric liquid crystals. Mixtures of different cholesteric liquid crystals were studied for their optical properties at various temperatures, with the optimum tuned bandgap observed in mixtures coded AMJ3 and AMJ4.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Multidisciplinary Sciences
Oxana Prishchepa, Mikhail Krakhalev, Vladimir Rudyak, Vitaly Sutormin, Victor Zyryanov
Summary: This study focuses on the electro-optical cell based on cholesteric liquid crystal with unique boundary conditions, involving conical anchoring on one substrate and planar anchoring on another. The periodic structures within the cholesteric layer and their transformation under applied electric field are studied using polarizing optical microscopy and computational analysis. The research shows that by applying a voltage, the growth direction of the defect lines forming a diffraction grating can be controlled, with U+-defects moving along the lines when the voltage exceeds 1.3V.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Xiujuan Liu, Chaofeng Qu, Sijie Zhou, Wenzhu Cao, Minxing Xu, Yongjun Liu
Summary: In this article, an optical fiber sensor based on cholesteric liquid crystals (CLCs) is proposed for monitoring the concentration of acetone in a gas-liquid two-phase environment. The sensor compensates for temperature changes and has the advantages of small size and convenient measurement method.
OPTICS COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Arne A. F. Froyen, Michael G. Debije, Albert P. H. J. Schenning
Summary: In this study, structural colored PDCLC coatings were prepared by mixing distinctive thermosensitive photonic microdroplets, which exhibited optical time-temperature responses. Different optical time-temperature responses can be achieved by adjusting the composition of the photonic mixtures.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
V. S. SUTORMIN, M. N. KRAKHALEV, I. V. TIMOFEEV, R. G. BIKBAEV, O. O. PRISHCHEPA, V. YA. ZYRYANOV
Summary: The voltage dependences of polarization characteristics of light passed through cholesteric layers with tangential-conical boundary conditions have been investigated. It has been shown that these layers can rotate the polarization azimuth significantly, have advantages such as low control voltage, smooth variation of polarization azimuth, and simplicity of design, and can be used as an electrically controlled polarization rotator for white light.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Optics
Arturo Reyes-Romero, J. Adrian Reyes
Summary: In this study, a planar waveguide with a confined cholesteric liquid crystal was examined, and the electromagnetic equations describing the dynamics of propagating modes were solved numerically. The study revealed the propagating parameter and the ratio between magnetic and electric modes as a function of frequency, aligning with the band structure of the modes. The profiles of electromagnetic field amplitudes and the distribution of the Poynting vector were also calculated, along with a discussion on the embodiment of transverse electric and magnetic modes in the eigen modes and their propagation conditions.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Wan-Li He, Ya-Qian Zhang, Wen-Tuo Hu, Hui-Min Zhou, Zhou Yang, Hui Cao, Dong Wang
Summary: In this study, a liquid crystal composite material was developed for tuning the reflective bands. By doping specific compounds, the reflective bands can be adjusted by tuning the electric field parameters. The effects of electric field frequency, voltage, retention time, and molecular structure on the reflection bandwidth were investigated in detail.
Article
Materials Science, Multidisciplinary
Chenjing Yang, Baiheng Wu, Jian Ruan, Peng Zhao, Jianzhen Shan, Rui Zhang, Dong Ki Yoon, Dong Chen, Kai Liu
Summary: The article presents a method to increase the selective Bragg reflection of CLC droplets and demonstrates the unique mechanochromic responses of CLC-droplet-dispersed polymer films. By tuning the helical pitches, the desired structural color is achieved, paving the way for the developments of CLC-based functional materials and smart devices.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Physical
W. S. Braga, O. R. Santos, N. M. Kimura, M. Simoes, A. J. Palangana
Summary: By studying the optical signals of lyotropic cholesteric liquid crystalline phases under different conditions, it was found that the optical signal of the biaxial cholesteric phase depends on the phases surrounding it when situated between uniaxial cholesteric phases, and must undergo a change if located between uniaxial phases with opposite optical signals.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Nanoscience & Nanotechnology
Saddam Hussain, Soo-Young Park
Summary: The unique combination of photonic helicoidal structure and rubber-like properties in cholesteric liquid-crystal elastomers results in a highly stretchable mechanochromic film capable of reflecting both right- and left-handed circular polarized light. The patterned photonic CLCE film, controlled by applied strain, can encrypt data and camouflage itself under unpolarized daylight. These elastomers have potential applications in sensors, robotics, displays, encryption, and anti-counterfeiting due to their mechanochromic capabilities.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Applied
Tao Xu, Hongkun Li, Wei Liu, Yi Li, Baozong Li, Yonggang Yang
Summary: Organic-inorganic hybrid silica films with circularly polarized luminescence (CPL) properties were prepared by in-situ polycondensation of a cholesteric liquid-crystalline organosilane, chiral dopant, and aggregation-induced emission (AIE)-active tetraphenylethene (TPE) derivative under acidic conditions. The resulting films exhibited bright CPL with absolute g(lum) values of approximately 0.15, predominantly attributed to the long-range ordered supramolecular helical structure. The handedness of the CPL was determined by the selective reflection of the cholesteric liquid crystal films.
Article
Optics
Yo Inoue, Hiroshi Moritake
Summary: A cholesteric liquid-crystal gel with fast and continuous wavelength shift is fabricated and demonstrated in a laser scanning device.
Article
Chemistry, Multidisciplinary
Yang Li, Yihan Chen, Hang Li, Chao Liu, Lulu Li, Yiwu Quan, Yixiang Cheng
Summary: Cholesteric liquid crystal platforms have achieved high-performance circularly polarized luminescence (CPL) through the organized arrangement of achiral dyes. This study developed a regulation strategy for CPL-active CLC materials by using the orientational order parameter of achiral dichroic dyes. The results showed that increasing the order parameter value of the dichroic dye improved the CPL emission and contrast ratio in CLC, opening a new avenue for developing excellent CPL-active display materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Optics
Hang Dong, Zhixin Sun, Jingyi Li, Yahui Li, Wei Zhang, Guangyong Jin
Summary: This paper calculates thermal stresses and adsorption forces to determine laser cleaning conditions and establishes relevant models. Experimental results show that the removal effect is better with increasing nanosecond pulse delay, with the best effect achieved at 600 milliseconds pulse delay. Based on the findings, the mechanisms of oxide film removal involve thermal stress against adsorption and plasma shock wave breaking the oxide layer.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Junjie Zhang, Wenjun Li, Bingtao Li, Zheng-Da Hu, Jicheng Wang, Feng Zhang, Lei Wang
Summary: A multilayer thin film device structure based on Tamm plasmons is proposed for high-performance near-infrared hot electron photodetectors. By optimizing the device structure parameters, high responsivity detection can be achieved.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hong Huang, Zhiguang Han
Summary: This paper proposes a new ghost imaging reconstruction method using ordered orthogonal Hadamard derived speckle as the illumination speckle series, and introduces the alternating direction multiplier method to improve the imaging performance. The evaluation results show that the method can achieve high-quality reconstructed images under low sampling conditions.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Moritsugu Sakamoto, Yuki Ono, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Masayuki Tanaka, Hiroshi Ono
Summary: The effect of wavelength and polarization of illuminating light in polarization imaging for birefringent objects placed behind a scattering structure was experimentally investigated. The result shows that the spatial distribution of the birefringent object was more clearly visualized in the longer wavelength combined with circularly polarized light illumination. This finding indicates the potential of using polarization imaging with circularly polarized light illumination in the near-infrared range for visualizing birefringent objects with scattering.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Peihui Du, Hongfang Wang, Pengwei Li, Rukeyemuhan Abadula, Hmbat Batelbek, Min Gao
Summary: In this study, we theoretically demonstrate the strong coupling between Tamm plasmons and exciton polaritons in metal Al/DBR-molecular structures, extending the operating wavelength to the deep ultraviolet region. The coupling strength can be effectively manipulated by adjusting the structure parameters, offering potential benefits for the development of new-style optical filters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Priyanka Chaudhary, Akhilesh Kumar Mishra
Summary: We design and numerically investigate the switching dynamics between two outer waveguides in a parity-time (PT)-symmetric adiabatically coupled three waveguides nonlinear directional coupler (NLDC) system. The study shows that the device can provide switching even when the middle waveguide is nonlinear and the outer waveguides are linear. Furthermore, the effect of loss to gain ratio on critical switching power and the impact of launched light power and gain (loss) value on transmitted power are also studied.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Wei Feng, Yongcong Yi, Shuyang Li, Zhi Xiong, Boya Xie, Zhen Zeng
Summary: Traditional imaging techniques are ineffective in achieving clear underwater imaging due to the presence of scattering media. Single-pixel imaging (SPI) system based on Unet++ offers a solution for reconstructing high-quality images in highly turbid water environments.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiaorui Qu, Jufeng Zhao, Haijun Tian, Junjie Zhu, Guangmang Cui
Summary: This paper studies the structural similarity between RGB and spectral images and proposes a non-iterative Images Structure Similarity (ISS) method for fast reconstruction of spectral images. Additionally, the input of the Deep Image Prior (DIP) method is optimized for the first time by using the initial spectral data reconstructed by ISS, leading to an improved starting value for the iteration. The experimental results show that the proposed method can enhance the reconstruction quality in both spectral and spatial resolutions, while significantly reducing the reconstruction time compared to other DIP-based methods.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Donghe Sheng, Zhe Han, Zanyang Qiao, Tianpei Dong, Chenxi Wang, Huiping Tian
Summary: In this study, a distributed multi-parameter sensor based on an etched few-mode multi-core fiber is proposed, allowing simultaneous sensing of temperature, strain, and sample refractive index. By combining space division multiplexing and stimulated Brillouin scattering, the sensor achieves high sensitivity in detecting these parameters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Dehao Chen, Zhenwu Mo, Zehong Liang, Junjie Jiang, Huilin Tang, Yidan Sun, Ziyu Wang, Quanfeng Wei, Yanru Chen, Dongmei Deng
Summary: In this study, a novel family of elliptical Airyprime vortex beams (EAPVBs) is introduced, which inherits the excellent self-focusing properties of the circular Airyprime vortex beam (CAPVB). The asymmetric focusing of EAPVB leads to some novel properties, such as the splitting of high-order optical vortex and the formation of two foci. By taking advantage of these properties, EAPVB is constructed as a tunable optical bottle for particle capture.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiao Ma, Qiongchan Shao, Jian-Jun He
Summary: In this study, an SHS chip based on Su8 waveguide was designed and fabricated. By physically adjusting the metal electrodes and compensating for transmissivity fluctuations, the generation of side ripples was successfully suppressed.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hongbin Zhang, Jiansen Du, Zongtao Chi, Hailin Cong, Bin Wang
Summary: In this paper, a novel type of dual-wavelength confocal metalens is proposed to solve the spatial crosstalk between two wavelengths. The metalens can greatly reduce the spatial crosstalk and achieve high precision and efficiency in confocal imaging. It can also focus light in specific wavelength ranges, making it suitable for imaging, microscopy, and optical fiber communication.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Rui Qiu, Guanmao Zhang, Shaokai Du, Jie Liu, Hongyu Jib, Kaiyun Bi, Bochuan Xing, Guangchao Diao
Summary: Recent research has developed an achromatic metalens that shows potential for replacing traditional lenses. This study focuses on a continuously variable focus height broadband achromatic metalens for long-wavelength infrared applications. By optimizing materials and parameters, chromatic aberration is effectively corrected, making it suitable for high-resolution LWIR imaging and spectroscopy systems.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Marcos Troncoso-Costas, Gaurav Jain, Yiming Li, Mohammed Patel, Lakshmi Narayanan Venkatasubramani, Sean O'Duill, Frank Smyth, Andrew Ellis, Francisco Diaz-Otero, Colm Browning, Liam Barry
Summary: In this work, a fast-switching tuneable laser capable of wide wavelength coverage, low noise and linewidth levels suitable for high-order modulation formats is demonstrated. The laser is characterized to cover a wavelength range of 35 nm in the C-band with nanosecond switching time. It is used to successfully demonstrate 480 Gbit/s 16QAM transmission over 25 km of single-mode fiber for a wavelength range of 19 nm.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Takeshi Moriyasu, Masahiko Tani, Hideaki Kitahara, Takashi Furuya, Jessica Afalla, Toshiro Kohmoto, Daishiro Koide, Hiroki Sato, Mitsutaka Kumakura
Summary: Optical pump-terahertz probe spectroscopy was used to study the photocarrier dynamics and optical characteristics of semiconductor Si. The results showed that the thickness of Si influenced the transmitted terahertz field amplitude and peak delay time, indicating differences in photocarrier dynamics between different Si materials.
OPTICS COMMUNICATIONS
(2024)