Article
Materials Science, Multidisciplinary
Jean-Jacques Marigo, Agnes Maurel, Kim Pham
Summary: In this study, we analyze the band structure of a single-phase metamaterial involving low-frequency flexural resonances by combining asymptotic homogenization and Bloch-Floquet analysis. We provide a closed-form expression of the dispersion relation in the whole Brillouin zone and demonstrate the existence of band-gaps and negative refraction in the hyperbolic regions of the dispersion diagram at low frequencies. Our findings are validated through direct numerical calculations.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
Tan Zhang, Chunqi Zheng, Zhi Ning Chen, Cheng-Wei Qiu
Summary: Negative reflection and refraction can be achieved in biaxial vdW materials by manipulating the interface and crystal direction, allowing for high tunability. This discovery has potential applications in polaritonics and on-chip integrated circuits.
Article
Nanoscience & Nanotechnology
Hanlyun Cho, Younghwan Yang, Dasol Lee, Sunae So, Junsuk Rho
Summary: This paper presents a vertically stacked metal-dielectric multilayer vertical hyperbolic metamaterial (vHMM) that operates in the visible spectrum. The research explores the relationship between negative refraction and effective permittivity, specifically focusing on the importance of the loss tangent in generating negative refraction. The designed vHMM exhibits negative refraction in the wavelengths between 450 and 550 nm, reaching the largest negative refraction at 500 nm wavelength.
Article
Multidisciplinary Sciences
Simone Zanotto, Giorgio Biasiol, Paulo V. Santos, Alessandro Pitanti
Summary: The study demonstrates a method to break the symmetry of known negative refraction systems by using a metamaterial with an asymmetric unit cell. It relies on the specific shape of the Bloch mode isofrequency curves. The research is of significance for the development of advanced technologies.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Anas Othman, Saeed Asiri, M. Al-Amri
Summary: We investigate the Goos-Hanchen shift (GHS) of a reflected light beam from a cavity with a double-Lambda atomic medium bounded by two glass slabs, by applying coherent and incoherent fields. Positive and negative controllability of GHS can be achieved by adjusting the parameters of the system. Large GHS amplitudes, about 10^3 times the incident light beam wavelength, are observed at specific values of the parameters, and these large shifts can be observed at multiple incident angles and a wide range of atomic medium parameters.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Chengshuai Su, Ceji Fu
Summary: In this paper, the reflection and refraction of a natural hyperbolic material calcite with in-plane anisotropy were theoretically and numerically studied. The results show that all-angle total reflection and all-angle negative refraction phenomena can occur in specific conditions, and novel designs of fibers and filters were proposed based on these findings.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Nanoscience & Nanotechnology
Haixia Da, Qi Song, Pengya Hu, Huapeng Ye
Summary: Negative refraction materials are essential for controlling light propagation, and it has been discovered that three-dimensional Dirac semimetals can enable negative refraction. This can be achieved by stacking three-dimensional Dirac semimetals and dielectric layers, and the group refractive angle can be controlled by the Fermi energy of the Dirac semimetals.
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
Construction & Building Technology
Wallace W. L. Lai, Ray K. W. Chang, Christoph Volker, Bella W. Y. Cheung
Summary: This study investigates the dispersion of GPR wave's phase velocity at different wideband frequencies in plywood and concrete, finding greater dispersion in low frequency regimes. The methodology includes time-frequency analysis and coherence plotting to determine the effective frequency bandwidths.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Congcong Luo, Hengheng Zhu, Bing Yao, Yuanyuan Liu, Deling Li, Ming Song, Wenchang Zhuang, Yan Chen, Feng Chen, Jiwei Wang
Summary: Temperature and reflection angle-responsive glassy cholesteric LC coatings were successfully fabricated by applying glassy cholesteric LC siloxane via screen printing method. The presence of chiral monomers enabled the coatings to retain their responsiveness characteristics.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Yi Liu, Chunmei Ouyang, Quan Xu, Xiaoqiang Su, Jiajun Ma, Jing Zhao, Yanfeng Li, Zhen Tian, Jianqiang Gu, Liyuan Liu, Jiaguang Han, Weili Zhang
Summary: Hyperbolic metasurfaces exhibit rich dispersion engineering and topological transitions, enabling multi-directional topological transitions and surface plasmon polariton propagation, with the ability for new types of negative refraction, which will help overcome the diffraction limit.
Article
Physics, Multidisciplinary
Martin T. Hill
Summary: This study extends the concept of a compact optical switch based on moving a negative-index media (NIM) load to include waveguides carrying transverse magnetic (TM) modes. Simulations show that switching is possible for TM modes using current metamaterial NIM implementations.
Article
Acoustics
Richard Porter
Summary: A periodic array of thin rigid plates can act as a negative refraction metamaterial under certain conditions, with an effective medium approximation used to model the behavior of the array. The array demonstrates perfect wave transmission at all frequencies when the tilt angle of the plates is opposite to the incident wave direction.
Article
Materials Science, Multidisciplinary
Peng-Hui Li, Yi-Ze Wang
Summary: In this study, negative refraction and exceptional point (EP) in piezoelectric mechanical metamaterials are explored in conjunction with the Parity-Time (PT) symmetry. Multiple refraction modes are excited by oblique incidence of anti-plane shear wave at the interface between a homogeneous medium and phononic crystal. The dispersion relation and transfer matrix method are used to illustrate the propagation characteristics in periodic layers. The refraction angle at the interface of piezoelectric metamaterials is derived using the normal mode decomposition and time average Poynting vector. Beam splitting and pure negative refraction are demonstrated with different incident angles. The complex conjugate of Bloch wave number appears in the dispersion relation due to the mechanical and electric coupling, degenerating to the exceptional point. Moreover, a defect layer is introduced to investigate the transmission coefficient of two phononic crystals with different arrangements. When gain and loss are introduced into the metamaterials, the Parity-Time symmetry system is realized, achieving complete transmission with unidirectional zero reflection at the exceptional point.
MECHANICS OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Danqi Wang, Yuxiang Wang, Xuewen Li, Haokui Yan, Xiaojun Huang
Summary: This study introduces a water-based metamaterial design to achieve negative refraction with broadband capabilities. The feasibility of the design is verified through simulation and measurement results.
MATERIALS RESEARCH EXPRESS
(2022)
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
Multidisciplinary Sciences
Karol Tarnowski, Tadeusz Martynkien, Pawel Mergo, Jaroslaw Sotor, Grzegorz Sobon
SCIENTIFIC REPORTS
(2019)
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