Article
Optics
Ruijia Xu, Xiaocan Xu, Bo-Ru Yang, Xuchun Gui, Zong Qin, Yu-Sheng Lin
Summary: The integration of MEMS with metamaterial has provided a novel route to achieve programmability, and the use of switchable metamaterial in a MEMS-based metadevice demonstrates multifunctional characteristics, capable of performing logic operations of OR and AND gates simultaneously.
PHOTONICS RESEARCH
(2021)
Article
Physics, Applied
Junjie Zhan, Yujian Mei, Kai Li, Yi Zhou, Jian Chen, Yungui Ma
Summary: In this work, a bi-physical metamaterial invisible coating technique is proposed, which can effectively hide underwater objects from being detected via both magnetic fields and acoustic waves. This technique has the potential for important applications in military and civilian fields.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Chui Inami, Yuki Kabe, Yota Noyori, Akinori Iwai, Alexandre Bambina, Shigeyuki Miyagi, Osamu Sakai
Summary: Researchers have demonstrated a plasma-metamaterial composite device that can function as an absorber, scatterer, or flattener by changing a narrow-range microwave frequency. This device creates abnormal permeability in the space with plasma acting as a dynamic medium for manipulating microwaves, and experimental verification of microwave manipulation has been conducted through monitoring scattering energy.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Mengyao Chen, Xiangying Shen, Zhen Chen, Jack Hau Yung Lo, Yuan Liu, Xinliang Xu, Yilin Wu, Lei Xu
Summary: Metamaterials are artificial materials with unique structures that can achieve special properties. In breast cancer research, the invisibility of glutathione peroxidase 2 (GPx2) has attracted attention for its significant role in cancer cell signaling and patient survival. The study discovered various designs of invisible metamaterials and successfully realized a multifunctional hydrodynamic metamaterial, which may have potential applications in tissue engineering and drug release.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Optics
Shijie Zhang, Qi Wang, Xufeng Gao, Ruijin Hong, Dawei Zhang
Summary: This study proposes a bidirectional dynamic tunable absorber based on a thin film dielectric-metal multilayer structure, which exhibits excellent absorption performance in the near-infrared range. The narrowband absorption can be dynamically tuned via PDLC modulation, and the angular and polarization tolerances of both narrowband and broadband absorptions are demonstrated.
OPTICS COMMUNICATIONS
(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.
Article
Biochemistry & Molecular Biology
Doina Manaila-Maximean
Summary: This paper studies the effective dielectric properties of heterogeneous materials using the Maxwell Garnet and Bruggeman theory, with applications in various materials. The results can be used in designing electrical circuits by calculating the effective permittivity of composite materials.
Article
Physics, Multidisciplinary
Frankbelson dos Santos Azevedo, Jose Diego M. de Lima, Antonio de Padua Santos, Tiago A. E. Ferreira, Fernando Moraes
Summary: By utilizing both ray and wave optics, it has been demonstrated that a straightforward device composed of a hyperbolic metamaterial film on a catenoid surface is capable of light trapping. The study of light trajectories reveals a tendency for the rays to wrap and become trapped around the device's neck. The wave equation exhibits an effective attractive potential, and the solutions confirm the bound states suggested by the trajectories.
Article
Engineering, Electrical & Electronic
Kirtika Yadav, Govind Pathak, Shikha Agarwal, Shivangi Tripathi, Sandeep Kumar, Atul Srivastava, Rajiv Manohar
Summary: In this study, the dispersion of carbon quantum dots in a nematic liquid crystal was investigated. It was found that the dielectric permittivity and contrast ratio of the liquid crystal increased, while the birefringence and threshold voltage decreased with an increase in the concentration of quantum dots. These findings are significant for liquid crystal displays and opto-electronic devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Optics
Yichao Liu, Fei Sun, Yibiao Yang, Yuying Hao, Shaowei Liang, Zheng Wang
Summary: A full space omnidirectional cloak is designed by thrice coordinate transformations inside the optic-null medium (ONM) shell. The cloak can be realized using subwavelength dielectric channels and metallic plates, along with a uniform dielectric restoring core in air, without the need for metamaterials or waveguide structures. The electromagnetic parameters of the cloak are strict in accordance with transformation optics, resulting in a nearly perfect omnidirectional cloaking effect achieved by natural materials at the design frequency. The shape, size, and position of the concealed region can be freely adjusted due to the transformation-invariant feature of the ONM.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Jing Yan, Xiangwen Fan, Yifan Liu, Ying Yu, Yuming Fang, Ruo-Zhou Li
Summary: A patterned polymer dispersed liquid crystal transparent display using one-time UV exposure is demonstrated. The device can achieve different display states by controlling the applied voltage, showing potential applications in smart windows and transparent projected displays.
CHINESE OPTICS LETTERS
(2022)
Article
Chemistry, Inorganic & Nuclear
Yumeng Gao, Siyu Liu, Jiudi Zhang, Xiaoyang Chen, Bing Han, Yali Wang, Jianhua Guo, Zhanshuang Jin, Junjie Li, Xudong Meng
Summary: By synthesizing oxygen vacancy-enriched NiCo2O4 nanospheres to modify the separator of lithium-sulfur batteries, the conversion of polysulfides is accelerated, and more active sites are provided, thereby improving the electron conduction rate and ion transport rate, resulting in excellent electrochemical performance of the battery.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Xin Li, Yijun Zhang, Mingxiao Li, Yang Zhao, Lingqian Zhang, Chengjun Huang
Summary: An improved protocol for preparing 2D colloidal monolayers at the air/water interface was proposed, resulting in wafer-scale monolayers with increased crystal domain size and prevention of nanosphere sinking.
Article
Optics
Wenbin Feng, Zhiqiang Liu, Mao Ye
Summary: By designing the shape of the indium tin oxide electrode and controlling the driving voltage range, a cylindrical liquid crystal lens with near-ideal phase profile was successfully designed and manufactured.
Article
Polymer Science
Chia-Yi Huang, Shih-Hung Lin
Summary: This study investigates diffraction gratings of polymer-dispersed liquid crystal with polarization-selective characteristics. Electrically controllable gratings are created using In-Plane Switching electrodes. The number of diffraction orders can be controlled by voltage, and the highest intensity is obtained for every order except the zeroth order. The polarization direction of the diffraction is perpendicular to the direction of the electrode stripes.
Article
Chemistry, Analytical
Gabriela Statkiewicz-Barabach, Karol Tarnowski, Dominik Kowal, Pawel Mergo
Article
Optics
Bikashkali Midya, Han Zhao, Xingdu Qiao, Pei Miao, Wiktor Walasik, Zhifeng Zhang, Natalia M. Litchinitser, Liang Feng
PHOTONICS RESEARCH
(2019)
Article
Chemistry, Multidisciplinary
Yun Xu, Jingbo Sun, Jesse Frantz, Mikhail Shalaev, Wiktor Walasik, Apra Pandey, Jason D. Myers, Robel Y. Bekele, Alexander Tsukernik, Jasbinder S. Sanghera, Natalia M. Litchinitser
APPLIED SCIENCES-BASEL
(2019)
Article
Optics
Wiktor Walasik, Nitish Chandra, Bikashkali Midya, Liang Feng, Natalia M. Litchinitser
Article
Optics
Anupamaa Rampur, Dirk-Mathys Spangenberg, Grzegorz Stepniewski, Dominik Dobrakowski, Karol Tarnowski, Karolina Stefanska, Adam Pazdzior, Pawel Mergo, Tadeusz Martynkien, Thomas Feurer, Mariusz Klimczak, Alexander M. Heidt
Article
Optics
Danielle Reyes, Jessica Pena, Wiktor Walasik, Natalia Litchinitser, S. Rostami Fairchild, Martin Richardson
Article
Optics
Karol Tarnowski, Sylwia Majchrowska, Pierre Bejot, Bertrand Kibler
Summary: This study compares ultrashort pulse propagation and possible conical emission in multimode optical fibers using two numerical approaches. The impact of frequency dispersion on pulse splitting and supercontinuum dynamics in the femtosecond regime is confirmed, and the modal distribution of optical fibers discretizes conical emission of the corresponding medium. The study provides criteria for using numerical models and paves the way for future nonlinear experiments in commercially available optical fibers.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Optics
Olga Szewczyk, Karol Tarnowski, Aleksander Gluszek, Daniel Szulc, Karolina Stefanska, Pawel Mergo, Grzegorz Sobon
Summary: This study presents a comparison between two types of femtosecond 2 μm sources for seeding of an ultrafast thulium-doped fiber amplifier based on all-normal dispersion supercontinuum and soliton self-frequency shift. The results show that solitons exhibit comparable performance to supercontinuum in terms of relative intensity noise and stability, and can be successfully used as a seed for Tm-doped fiber amplifiers.
Article
Engineering, Electrical & Electronic
Robert E. Tench, Wiktor Walasik, Jean-Marc Delavaux
Summary: Novel Holmium-doped fiber amplifiers with medium slope efficiency (64%) were designed using alternative in-band pump wavelengths in the 1720-2000 nm spectral region. Simulations showed that pump wavelengths of 1840-1860 nm can significantly improve output power, gain, and optical-optical conversion efficiency compared to the previous pump wavelength of 1940 nm, with experimental data verifying the results.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Wiktor Walasik, Daniya Traore, Alexandre Amavigan, Robert E. Tench, Jean-Marc Delavaux, Emmanuel Pinsard
Summary: The research presents the design and performance of a single frequency all-fiber DFB laser source utilizing fiber Bragg gratings, with high output power, high SNR, and tunable emission wavelength. After amplification with fiber amplifiers, the output power can reach high levels and the laser linewidth becomes narrower.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Wiktor Walasik, Robert Tench, Jean-Marc Delavaux, Eric Lallier
Summary: The design and performance of a 2 μm dual-stage polarization maintaining holmium-doped fiber amplifier (HDFA) operating in both continuous-wave (CW) and pulsed regime is reported. The amplifier, pumped at 1860 nm, achieved over 1W of output power at 2051 nm and 2090 nm signal wavelengths in CW mode, and delivered up to 200W of peak power and 10 μJ of pulse energy in pulsed mode with excellent stability.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Sylwia Majchrowska, Kinga Zolnacz, Waclaw Urbanczyk, Karol Tarnowski
Summary: This study investigates the nonlinear frequency conversions between the six polarization modes of a two-mode birefringent fiber. The aim is to demonstrate that the selective excitation of different combinations of linearly polarized spatial modes at the pump wavelength initiates distinct intermodal-vectorial four-wave mixing processes. The theoretical predictions are verified through numerical simulations and confirmed experimentally.
Article
Optics
Karolina Stefanska, Sylwia Majchrowska, Karolina Gemza, Grzegorz Sobon, Jaroslaw Sotor, Pawel Mergo, Karol Tarnowski, Tadeusz Martynkien
Summary: This paper reports on the generation of trapped pulses in birefringent photonic crystal fiber. Linearly polarized ultrashort pulses are injected into the fiber in an anomalous dispersion regime. It is observed that a soliton pulse polarized along the fast fiber axis partially transfers its energy to the orthogonal polarization, and the generated pulse is amplified through the orthogonal Raman gain. The experimental results are consistent with numerical simulations, and they are important for applications using self-frequency shifted solitons that require high polarization purity.
Article
Engineering, Electrical & Electronic
Olga Szewczyk, Piotr Pala, Karol Lech Tarnowski, Jacek Olszewski, Chuang Lu, Aleksandra Foltynowicz, Francisco Senna Vieira, Pawel Mergo, Jaroslaw Sotor, Grzegorz Sobon, Tadeusz Martynkien
Summary: The study introduces a microstructured silica-based fiber design for widely tunable soliton self-frequency shift with high conversion efficiency, strong birefringence, and excellent polarization extinction ratio, covering important wavelengths and demonstrating high coherence in shifted solitons.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Nitish Chandra, Wiktor Walasik, Natalia M. Litchinitser
