Article
Engineering, Multidisciplinary
Liyun Cao, Yifan Zhu, Sheng Wan, Yi Zeng, Badreddine Assouar
Summary: This study presents a non-Hermitian loss-modulation beam and plate model based on complex wavenumber plane for designing lossy elastic metamaterials. The high-performance absorption of the metamaterial is achieved through a combination of dissipation-radiation balance and multiple reflections. The study provides a new approach for broadband low-frequency vibration suppression and offers an effective paradigm for wave engineering in non-Hermitian elastic wave systems.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
Marian Baah, Alesia Paddubskaya, Andrey Novitsky, Nadzeya Valynets, Mukesh Kumar, Tommi Itkonen, Markku Pekkarinen, Ekaterina Soboleva, Erkki Lahderanta, Maria Kafesaki, Yuri Svirko, Polina Kuzhir
Summary: A novel technique involving 3D printing, electroplating, and chemical vapor deposition was used to fabricate a polymer nanomembrane covered with multilayered graphene, showing nearly perfect absorption in the THz frequency range. The theoretical explanation provided insights into the dark mode formation of the metasurface, enabling potential applications in various fields requiring graphene/polymer nanomembranes.
Article
Materials Science, Multidisciplinary
Yang Meng, Vicente Romero-Garcia, Gwenael Gabard, Jean-Philippe Groby, Charlie Bricault, Sebastien Goude
Summary: Passive metamaterials provide efficient solutions for sound absorption in the low-frequency regime with deep subwavelength dimensions. They have been extensively applied in unidimensional reciprocal problems considering that an incident wave is either reflected or transmitted at the outlet boundary. This work presents a general design methodology of metamaterial absorbers for open-duct problems, which is a special case of impedance outlet boundary encountered in practical applications. Experimental validation is provided for maximum or perfect absorption, either at single frequencies or over specific frequency bands.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Multidisciplinary Sciences
Jerome Sol, Ali Alhulaymi, A. Douglas Stone, Philipp del Hougne
Summary: We experimentally demonstrate that reflectionless scattering modes (RSMs), a generalized version of coherent perfect absorption, can be used for reflectionless programmable signal routing, avoiding signal power echoes in radio frequency or photonic networks. Through microwave experiments, we observe routing functionalities such as wavelength demultiplexing and adaptability to multichannel excitation with coherent input wavefronts.
Article
Optics
Yulian Li, Wei Gao, Li Guo, Zihao Chen, Changjian Li, Haiming Zhang, Jiajia Jiao, Bowen An
Summary: A dynamically tunable ultra-broadband terahertz perfect metamaterial absorber based on vanadium oxide (VO2) has been proposed, with absorption bandwidth greater than 90% from 3.03 to 8.13 THz. By changing the conductivity of VO2, the absorption intensity can be dynamically tuned from 1.47% to 100%, showing significantly improved bandwidth and flexibility compared to previous reports.
Article
Optics
Haotuo Liu, Ming Xie, Qing Ai, Zhihao Yu
Summary: This study investigated the slow light effect, magnetic polaritons, and other physical model coupling mechanisms in photonic crystals to construct an efficient solar energy absorber. The simulation study showed that the absorber has a high photothermal conversion efficiency of 96.45% in the 0.3-2.5 μm band, which is 11% higher than traditional designs. Increasing the concentration factor allows the absorber to maintain high efficiency even at high temperatures.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Optics
Zhipeng Zheng, Ying Zheng, Yao Luo, Zao Yi, Jianguo Zhang, Li Liu, Qianjv Song, Pinghui Wu, Yang Yu, Jianfa Zhang
Summary: The study presents a terahertz metamaterial perfect absorber that combines ultra-broadband and narrowband absorption based on the phase transition properties of VO2. By adjusting the ambient temperature, the absorber can switch flexibly between ultra-broadband and narrowband absorption, showing significant improvement in absorption rate and bandwidth. The design is versatile and suitable for various applications.
Article
Materials Science, Multidisciplinary
David Dang, Aleksei Anopchenko, Sudip Gurung, Zoey Liu, Xuguo Zhou, Ho Wai Howard Lee
Summary: By constructing multilayer ENZ thin films, broadband ENZ properties and perfect absorption can be achieved. This work utilizes a residual generative neural network to optimize the broadband and perfect absorption properties of ultrathin ENZ materials, resulting in multi-stack ENZ layers with a maximum absorption above 99% over a bandwidth hundreds of nanometers wide.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Yuxin Jia, Huiqing Zhai, Chaozong Guo, Liwei Song
Summary: In this letter, a dual-band frequency selective rasorber (FSR) is proposed based on a composite absorption structure. The FSR consists of lossy layer I, lossy layer II, and a dual-band frequency selective surface (FSS). By combining the lossy layers I and II as a composite lossy structure, the absorption bands of lossy layers I and II are successfully connected in the frequency response, and the bandwidth of S-11 under -10 dB is extended from 3.1 to 20.6 GHz. The proposed FSR integrate dual-band, dual-polarized, and broadband absorption performance simultaneously.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Computer Science, Information Systems
Jie Xiong, Baoping Yang, Yanjie Wu, Xiongwei Zeng, Qiuyu Li, Rongxin Tang, Hai Lin
Summary: This article presents the design of a frequency-selective rasorber (FSR) with a broadband transmission window. The FSR is synthesized by a broadband absorber and a frequency-selective surface (FSS). The resistive layer achieves broadband absorption by introducing a tortuous Jerusalem cross load with lumped resistors, while the lossless FSS adopts a three-layer metal structure to realize the broadband transmission window. The simulation results demonstrate the promising performance of the designed FSR in terms of transmission window and absorption band. Hence, it holds potential application prospects in electromagnetic stealth technology and radar cross-section reduction.
Article
Physics, Applied
Zhigang Zhan, Yuge Han, Yutao Zhang
Summary: This paper proposes a rapid design method for broadband absorption metasurfaces by discretizing circular resonators into rectangular elements and establishing a complex equivalent LC circuit model. A metasurface composed of two circle-shaped metal-dielectric-metal resonators was designed based on impedance matching, with optimized geometric parameters and materials determined through numerical simulation. Experimental validation showed the metasurface's radiative cooling ability and achieved infrared stealth.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Yufan Li, Na Kou, Shixing Yu, Zhao Ding, Zhengping Zhang
Summary: This letter introduces a polarization-insensitive frequency selective absorber (FSR) which can achieve wide absorption band and wide transmission band. The FSR shows excellent characteristics of insensitivity to polarization and angle stability.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Yujie Zhong, Yi Huang, Shuncong Zhong, Tingting Shi, Fuwei Sun, Tingling Lin, Qiuming Zeng, Ligang Yao, Xuefeng Chen
Summary: This study achieves frequency-agile absorption adjustments by utilizing the coupling between total reflection prism and electrically-driven MoS2. The redistribution of electric field and susceptible dielectric response are found to be attributed to limited spatial near-field perturbation. The study also demonstrates that perturbed MoS2 plasmon modes promote the formation of dual-phase singularities to suppress attenuation of absorption amplitude, extending the relative tuning range.
Article
Optics
Jie Luo, Hongchen Chu, Ruwen Peng, Mu Wang, Jensen Li, Yun Lai
Summary: This study identified an exception to the Brewster effect by creating nonmagnetic anisotropic metamaterials to achieve anomalous Brewster effects with independently tunable absorption and refraction, offering the potential for unprecedented wide bandwidth for reflectionless absorption with high efficiency.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Optics
Baoku Wang, Ke Gai, Ruoxing Wang, Fei Yan, Li Li
Summary: This paper presents an interesting scheme of an ultra-broadband perfect terahertz (THz) absorber using a periodic-conductivity graphene metasurface. By modulating the conductivity of graphene in a periodic manner, the absorber can generate dense high-order resonance modes and achieve ultra-broadband continuous absorption. This scheme is significant for the development of broadband THz absorbers and has promising application prospects in THz stealth, imaging, and communication fields.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Grigorii Ptitcyn, Aristeidis Lamprianidis, Theodosios Karamanos, Viktar Asadchy, Rasoul Alaee, Marvin Mueller, Mohammad Albooyeh, Mohammad Sajjad Mirmoosa, Shanhui Fan, Sergei Tretyakov, Carsten Rockstuhl
Summary: This article explores the interaction between light and time-varying media, which not only provides fundamental insights but also opens up possibilities for various practical applications. Time modulation is a fundamental tool for controlling light in different ways, especially for complex systems with both spatial and temporal structures. The article develops and applies a self-consistent analytical theory of light scattering, focusing on a sphere made from a time-varying material with Lorentzian dispersion. The proposed theory is verified through full-wave simulations and reveals interesting effects such as energy transfer from the time-modulation subsystem to the electromagnetic field.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Shixuan Hao, Jicheng Wang, Ivan Fanayev, Sergei Khakhomov, Jingwen LI
Summary: This study investigates the super-resolution capability of different types of multilayered graphene-dielectric hyperbolic metamaterials to break the diffraction limit of light. A super-resolution of lambda/10 is achieved and the dispersion and super-resolution performance can be dynamically tuned by adjusting the chemical potential of graphene. The research is important for terahertz imaging systems and the development of hyperbolic metamaterial modulation devices.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Physics, Multidisciplinary
Zheng-Da Hu, Jicheng Wang, Yun Zhu, Mengmeng Li, Sergei Khakhomov, Igor Semchenko
Summary: We investigate the impact of non-Kolmogorov atmospheric turbulence on the Holevo channel capacity of a quantum communication scheme using the Hypergeometric Gaussian-II (HyGG-II) modes. By modulating the hollowness parameter, the HyGG-II modes exhibit higher capacity compared to the Laguerre-Gaussian modes. We explore the effects of low-order turbulence aberrations and find that tilt aberration dominates and defocus and astigmatism aberrations are negligible, while coma aberration becomes non-negligible under enhanced turbulence strength or channel zenith angle. Our results show that only total and tilt aberrations are sensitive to the non-Kolmogorov power-law exponent. This research has implications for quantum optical communication and aberration compensation in turbulent channels utilizing vortex beams.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Fu Liu, Do-Hoon Kwon, Sergei Tretyakov
Summary: Reconfigurable reflectors have great potential in future telecommunication systems, and there is active research on designing and realizing full and tunable reflection control. Reflectarrays, the classical approach to scanning reflectors, are based on phased-array theory and physical optics approximation. To overcome the limitations, researchers are actively studying inhomogeneous metasurfaces using diffraction grating theory. Unifying these two approaches and studying reconfigurable reflectors from a unified point of view is necessary for achieving tunability and realizing their full potential.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Sergei Kosulnikov, Francisco S. Cuesta, Xuchen Wang, Sergei A. Tretyakov
Summary: Reconfigurable Intelligent Surfaces (RISs) are promising tools for optimizing propagation channels in advanced wireless communication systems, particularly in high-frequency (millimeter-band) links with directive antennas. RIS panels act as high-gain passive repeaters, creating complex field patterns in the far zone through interference with reflected waves from illuminated spots on supporting walls. In this study, we develop a simple link-budget model for non-line-of-sight (NLOS) channels using reflections from finite-size metasurfaces (MSs) designed as anomalous reflectors or splitters. The model considers diffraction at RIS panel edges and interference with reflections from supporting structures, taking into account realistic losses and validating results through numerical simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Spectroscopy
I. V. Semchenko, S. A. Khakhomov, I. S. Mikhalka, A. L. Samofalov, P. V. Somov
Summary: The modeling confirms the polarization selectivity of a double DNA-like helix for waves with left and right circular polarization. Different lengths of helices are considered, and their resonance is achieved when the wavelength of the incident field is approximately equal to the helix turn length. The strongest reflected wave has the opposite twist direction of the electric vector relative to the double helix, indicating its ability to reflect waves with specific circular polarization.
JOURNAL OF APPLIED SPECTROSCOPY
(2023)
Article
Optics
Bolun Zhang, Zheng-Da Hu, Jingjing Wu, Jicheng Wang, Yanguang Nie, Feng Zhang, Mengmeng Li, Sergei Khakhomov
Summary: Topological charge (TC) is a crucial attribute of an optical vortex (OV) that indicates the twisted characterization of the wavefront. By transforming TCs into trigonometric functions of the azimuthal angle, perfect vortex beams (PVBs) with a sine-function TC can be generated using all-dielectric geometric metasurfaces. The proposed PVBs offer potential advancements in orbital angular momentum manipulation, information storage, and optical communication.
Correction
Materials Science, Multidisciplinary
Shixuan Hao, Jicheng Wang, Ivan Fanayev, Sergei Khakhomov, Jingwen Li
OPTICAL MATERIALS EXPRESS
(2023)
Article
Nanoscience & Nanotechnology
Mohamed Hesham Mohamed Mostafa, Mohammad S. Mirmoosa, Sergei A. Tretyakov
Summary: Recently, there has been extensive research on temporally varying electromagnetic media to explore new ways of controlling light. However, spin-dependent phenomena in these media have not been thoroughly investigated. In this study, we demonstrate the existence of spin-dependent phenomena at a temporal interface between chiral and dielectric media. We show that linearly polarized light is split into right-handed and left-handed circularly polarized waves with different angular frequencies and the same phase velocities due to the material discontinuity in time. This effect allows for high-efficiency temporal separation of the two spin states of light.
Review
Nanoscience & Nanotechnology
Igor V. Semchenko, Sergei A. Khakhomov
Summary: The DNA molecule is considered as an object of nature-like technologies, focusing on the special electromagnetic properties of DNA-like helices. DNA-like helices are regarded as artificial micro-resonators, exhibiting both dielectric and magnetic properties. The article presents methods for creating spatial structures directly from DNA molecules and DNA-like helices. It highlights the importance of considering the special electromagnetic properties of DNA-like helices in designing metamaterials and metasurfaces to obtain the desired properties and advantages over other artificial structures.
FRONTIERS IN NANOTECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Grigorii Ptitcyn, Mohammad Sajjad Mirmoosa, Amirhosein Sotoodehfar, Sergei A. Tretyakov
Summary: In recent years, there has been increasing interest in using time-modulation techniques to realize new phenomena and create new applications by varying system properties. This field, which originated in the middle of the previous century, has gained revitalized attention. In this tutorial article, the authors provide a historical overview and review the basic concepts in this field. They introduce the general theory of linear time-varying systems, discuss accounting for frequency dispersion in nonstationary systems, and elucidate models of time-varying electrical circuits and materials.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Sravan K. R. Vuyyuru, Risto Valkonen, Do-Hoon Kwon, Sergei A. Tretyakov
Summary: A perfect anomalous reflector is designed based on the receiving and scattering array antenna theory to optimize the scattering characteristics of a planar reflecting surface. By algebraic optimization of the load reactances, the reflection amplitudes into propagating Floquet modes can be controlled, avoiding the need for brute-force optimization via electromagnetic simulations. Numerical designs of wide-angle reflectors show that the proposed approach achieves higher reflection efficiencies compared to conventional reflectarray designs in a computationally efficient manner.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Mostafa Movahediqomi, Grigorii Ptitcyn, Sergei Tretyakov
Summary: This article discusses four main methods for designing anomalous reflectors for microwave and millimeter-wave applications and analyzes and discusses various performance aspects.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Materials Science, Multidisciplinary
Ivan Fanyaev, Ihar Faniayeu, Jingwen Li, Sergei Khakhomov
Summary: The proposed electro-thermally tunable hyperlens design, consisting of alternating graphene/metal/dielectric layers, enables subdiffraction far-field imaging and real-time amplification at terahertz frequencies. By tuning the chemical potential of the graphene layer through applied voltage, it enhances the intensity of the subwavelength image in the near and far zones. This dynamically tunable hyperlens offers multifunctional possibilities for light manipulation and improves the quality of subwavelength images in the terahertz range.
RESULTS IN PHYSICS
(2023)
Article
Optics
Alina V. Semchenko, Gagik Y. Ayvazyan, Viktoriya V. Malyutina-Bronskaya, Sergei A. Khakhomov, Dmitry L. Kovalenko, Andrei A. Boiko, Vitali V. Sidski, Anton V. Nestsiaronak, Alexander A. Mayevsky, Konstantin D. Danilchenko, Dmitry V. Zhigulin, Vladimir A. Pilipenko, R. Subasri, Nikolai V. Gaponenko
Summary: This study investigates the photocurrent and spectral sensitivity of silicon/SrTiO3:xNb/perovskite structures. The sol-gel method is used to deposit undoped SrTiO3 layers and niobium-doped (SrTiO3:Nb) layers with atomic concentrations of 3 and 6% Nb. The perovskite layer, CH3NH3PbI3-xClx, is deposited using the vacuum co-evaporation technique. The fabricated samples are characterized by scanning electron microscopy and X-ray diffraction measurements. The results show that the structures are photosensitive with a variation of photocurrent depending on Nb concentration, and the highest values are observed with a SrTiO3:Nb layer containing 3 at.% of Nb. The possibility of applying this structure in perovskite solar cells and photodetectors is discussed.