Article
Optics
Ankur X. Desai, Greg R. Schmidt, Duncan T. Moore
Summary: The advent of 3D printing optical elements has enabled the manufacturing of gradient-index (GRIN) optics that blend multiple materials. This study presents a method for spectral splitting using multi-material GRIN optics, which also generate optical power and allow for planar entrance and exit surfaces. It is demonstrated that this simultaneous focusing and spectral splitting is not feasible with a two-material GRIN. Comparative design studies using three and four-material GRIN are conducted, and an optimized four-material design is presented to showcase its potential.
Article
Optics
Jing Zhao, Xianfeng Wu, Di Cao, Mingchao Zhou, Zhijie Shen, Xiaopeng Zhao
Summary: This study presents a novel optical metamaterial that achieves negative refraction and inverse Doppler effect across most of the visible spectrum. The metamaterial is randomly assembled using a bottom-up approach and features narrowband, omnidirectional, and ultra low-loss characteristics.
PHOTONICS RESEARCH
(2023)
Article
Optics
A. Nkur X. Desai, G. Reg R. Schmidt, D. Uncan T. Moore
Summary: This study presents the advantages of multi-material gradient-index optics and introduces a new representation method for multi-material refractive index.
Article
Physics, Multidisciplinary
Muhammad Raza, Muhammad Ahsan, Wadi B. Alonazi, Syed Aftab Naqvi, Benjamin Braaten
Summary: This study proposes an irregular shape bifunctional cloak that can shield both electric and thermal fields, expanding its potential applications by allowing arbitrary shapes to be designed.
Article
Physics, Multidisciplinary
Runxuan Zhang, Zhengyong Song
Summary: This study designs a subwavelength multilayer meta-atom composed of gold mesh, gold disk, and polyimide to manipulate the electromagnetic wavefront in the terahertz band. By varying the diameter of the central gold disk, eight meta-atoms are prepared to achieve full phase modulation with a phase increase of 45°. A series of transmissive metasurfaces consisting of these meta-atoms are designed and demonstrated deflection, single-focusing, dual-focusing, and orbital angular momentum with l = -1 and l = -2. These metasurfaces are polarization-insensitive and can be used for compact terahertz systems.
Article
Nanoscience & Nanotechnology
Alberto Miguel-Torcal, Jaime Abad-Arredondo, Francisco J. Garcia-Vidal, Antonio Fernandez-Dominguez
Summary: In this study, we investigate the generation of entanglement between two quantum emitters by inverse-design engineering of their photonic environment. We use a topology-optimization approach to create dielectric cloaks at different inter-emitter distances and incoherent pumping strengths. The structures obtained maximize the dissipative coupling between the emitters and yield steady-state concurrence values that are significantly higher than those achievable in free space. We demonstrate that the entanglement enabled by our devices approaches the limit of maximum-entangled-mixed-states.
Article
Nanoscience & Nanotechnology
Hadi Teguh Yudistira, Muhammad Asril
Summary: The study focused on designing a cylinder-shaped negative refractive index metamaterial with high figure of merit based on paper, achieving negative refractive index at 3.4-3.91 GHz with high FoM. Simulation and evaluation of electromagnetic properties were conducted to determine the structure's performance.
MICRO & NANO LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Jinsha Song, Jiliang Mu, Zhengyang Li, Chengpeng Feng, Wenping Geng, Xiaojuan Hou, Jian He, Xiujian Chou
Summary: This study presents a transparent composite film that serves as an antireflective coating for solar cells and an enhanced triboelectric layer for a raindrop-harvesting nanogenerator. By incorporating micro-pyramid arrays and a conductive ionic liquid, the film effectively improves the performance of both the solar cells and the nanogenerator. This research provides a new technical approach for efficient multiclimate energy harvesting.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Materials Science, Multidisciplinary
Li-Mei Xue, Yue-Jiao Wang, Xian-Jun Liu, Zhen-Jun Yang
Summary: In this study, the propagation characteristics of adjustable abnormal hollow beams in gradient negative refractive index material are investigated theoretically and numerically. The results show that the intensity pattern, beam width, and axial intensity of AAH beams can undergo various changes during propagation, and different transmission types can be observed.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Analytical
Huiyuan Zhang, Zhensheng Wu
Summary: This paper focuses on the electromagnetic properties of graphene partial discharge sensors and develops a linear regression model based on the least-squares method. The simulation and experimental results confirm that graphene partial discharge sensors have better absorption of the partial discharge signal.
Review
Chemistry, Multidisciplinary
Jun Guan, Jeong-Eun Park, Shikai Deng, Max J. H. Tan, Jingtian Hu, Teri W. Odom
Summary: This review discusses the integration of plasmonic and dielectric metasurfaces with emissive or stimuli-responsive materials, enabling control of light-matter interactions at the nanoscale. Metasurfaces offer the ability to manipulate electromagnetic waves at the subwavelength level, while the combination with nanoscale emitters allows for enhanced photoluminescence, nanoscale lasing, controlled quantum emission, and formation of exciton-polaritons. Additionally, the use of functional materials that respond to external stimuli enables the engineering of tunable nanophotonic devices. Emerging metasurface designs, such as surface-functionalized, chemically tunable, and multilayer hybrid metasurfaces, hold promise for various applications including photocatalysis, sensing, displays, and quantum information.
Article
Optics
Xiaohan Du, Camilo Florian, Craig B. Arnold
Summary: In this Letter, the authors introduce a fast and versatile variable focal system using a tunable acoustic gradient of index lens for multi-focal laser processing. They demonstrate its application in femtosecond laser-induced volumetric modification in glass and laser machining on both surfaces of a transparent glass slide.
Article
Optics
Rensheng Xie, Xudong Bai, Ji Liu, Xiong Wang, Yinuo Zheng, Zhen Gu, Hualiang Zhang, Chengbin Jing, Jun Ding, Junhao Chu
Summary: This study proposes a single-cell metasurface with independent complex-amplitude modulations at two discrete frequencies, and verifies its ability to reconstruct multiple Chinese characters at the imaging plane through a designed bi-spectral meta-hologram.
Article
Materials Science, Multidisciplinary
M. Magri, L. Adam, J. Segurado
Summary: In this study, a computational homogenization approach is used to investigate the particle size effect in ductile composites. The micromechanical formulation incorporates a lower-order strain gradient plasticity model and an implicit gradient regularization technique. Numerical simulations and comparative studies with experimental results show that the considered model can quantitatively capture the particle size induced strengthening in metal matrix composites.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Environmental Sciences
Umesh Chejara, Anamika Prajapati, Arvind Kumar
Summary: This study synthesized and characterized nano-particles of polycrystalline magnesium and iron ferrite doped with rare earth materials. The electrical properties of these materials were measured, and it was found that they exhibit variation behavior with respect to frequency. The study suggests that these materials may have potential applications in the fabrication of microwave antennas to reduce energy losses.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Qiao Cheng, Yang Hao, Jack McGhee, William G. Whittow, J. C. Vardaxoglou, Raj Mittra, Shiyu Zhang
Summary: This article proposes a broadband dual circularly polarized reflectarray based on 3-D printed dielectric materials. By adjusting the phases of the orthogonal LP waves and optimizing the feed placement, a wide bandwidth and high gain are achieved.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Yufang Wang, Yuehe Ge, Zhizhang Chen, Xin Liu, Jixiong Pu, Kaiting Liu, Huanyang Chen, Yang Hao
Summary: The study demonstrates a high-efficiency broadband ultrathin metasurface incorporating metallic gratings and double-split-ring resonators. The metasurface has multiple functionalities, generating beams with different orders and vortex beams with various orbital angular momentum modes in both reflection and transmission spaces.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Mathematics
Benjamin Vial, Yang Hao
Summary: Technological advances in nanofabrication have opened up new applications in nanophotonics, but rigorous and efficient numerical methods are needed. Tremendous advances in algorithmic differentiation have made large-scale optimization of devices possible with minor modifications to the underlying code. Researchers have developed three software libraries for solving Maxwell's equations in different contexts and demonstrate inverse design examples.
Article
Engineering, Electrical & Electronic
Khaleda Ali, Alessio Brizzi, Ahsan Noor Khan, Yang Hao
Summary: This article presents an analysis of on-body radio channels at millimeter-wave frequencies and proposes solutions to reduce the path loss, particularly at non-line of sight (NLoS) locations. The study conducted at 94 GHz reveals that the presence of textile and thin air between clothing and the human body surface can lower the path loss at NLoS. Additionally, attaching a thin metallic sheet underneath clothing further reduces the path loss.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Chemistry, Inorganic & Nuclear
Hangfeng Zhang, A. Dominic Fortes, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: In this study, a new type of material with antiferroelectric characteristics has been reported, despite having a polar crystal structure. The material exhibits double polarization-electric field hysteresis loops over a wide range of electric field and temperature, which is different from previous observations. The study also reveals the phase transitions and structural changes in the material, and confirms its stable dielectric performance in the microwave frequency range.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Andrew Butler, Christos Argyropoulos
Summary: In this work, the unique properties of a plasmonic Huygens' metasurface composed of active metal-dielectric core-shell nanoparticles are analyzed. The reflection and transmission coefficients of the metasurface are calculated under various levels of gain, demonstrating the existence of reflectionless transmission when an exceptional point is formed. The proposed new active metasurface design, with subwavelength thickness, can be used to realize ultracompact perfect transmission optical filters.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
Yubei He, Cheng-Xiang Wang, Hengtai Chang, Rui Feng, Jian Sun, Wensheng Zhang, Yang Hao, El-Hadi M. Aggoune
Summary: In this paper, a 3-dimensional non-stationary geometry-based stochastic model is proposed for maritime massive MIMO communication systems. A novel beam domain channel model is then proposed, which transforms the corresponding stochastic model from the array domain to the beam domain. Two methods are used to characterize the array non-stationarity, and important channel statistical properties are studied and compared based on the proposed models.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Parvathy Chittur Subramanianprasad, Yihan Ma, Achintha Avin Ihalage, Yang Hao
Summary: The design of metasurface arrays to minimize radar cross-section has been extensively studied. The use of conventional optimization algorithms such as genetic algorithm and particle swarm optimization presents a challenge in terms of computation time, especially for large arrays. This study proposes the application of active learning, a machine learning optimization technique, to significantly speed up the optimization process and obtain similar results compared to genetic algorithm. The active learning strategy outperforms genetic algorithm in terms of computational efficiency, particularly for larger metasurface arrays.
Review
Engineering, Electrical & Electronic
Young-Ok Cha, Achintha Avin Ihalage, Yang Hao
Summary: The past century has seen significant progress in antennas and propagation (A&P) research, bringing about major changes to society and technology. In this article, a natural language processing (NLP) and machine learning (ML) approach is introduced to review A&P research based on large-scale unstructured data, providing meaningful summaries and predictions. Through analyzing 159,000 research papers published between 1981 and 2021, and applying an encoder-decoder LSTM network with integrated attention mechanism, future trends in A&P research are predicted in the form of a Gartner's hype cycle.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Physics, Applied
Tianjing Guo, Christos Argyropoulos
Summary: Graphene can support highly confined plasmons and can strongly couple with nanostructures and gratings, leading to new hybrid systems for investigating complex plasmonic phenomena. In this Perspective, the excitation of graphene plasmons and their strong coupling with metallic or dielectric gratings are analyzed, highlighting the flexibility in controlling light-matter interaction. The hybrid graphene-plasmon grating systems offer tunable plasmonic resonances with enhanced field distributions, enabling practical applications such as nonreciprocal devices, plasmonic switches, perfect absorbers, nonlinear structures, photodetectors, and optical sensors.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
Andrew Butler, Christos Argyropoulos
Summary: Nonreciprocal thermal emission is a leading-edge technology that enables control over thermal radiation and has exciting applications in thermal energy harvesting. This work proposes different structures combining a Weyl semimetal thin film with additional layers to achieve nonreciprocal emission over a broad wavelength range and for multiple angles. The designs can be realized through simple deposition fabrication methods and have potential for use in creating broadband nonreciprocal thermal emitters for energy harvesting devices.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Benjamin Vial, Sebastien Guenneau, Yang Hao
Summary: We propose an optimization approach for designing wideband thermal cloaks for objects with large thermal conductivity. The cloak achieves near-perfect cloaking over a finite frequency band and performs well in the time domain, regardless of the initial temperature distribution. Interestingly, it also works fairly well for objects with high thermal conductivity but breaks down for those with low thermal conductivity.
Article
Materials Science, Multidisciplinary
Yihan Ma, Jonas Florentin Kolb, Achintha Avin Ihalage, Andre Sarker Andy, Yang Hao
Summary: Surface symmetry breaking and disorder have been utilized to address issues such as operation bandwidth, unwanted diffraction, and polarization dependence in metasurface designs. However, efficient simulation and optimization of large-scale electromagnetic structures remains challenging. This study presents an interactive learning approach to build meta-atom datasets with mutual coupling effects. A deep learning-based model extracts features from limited known meta-atoms to design aperture-efficient metasurfaces and metalenses at large scales.
ADVANCED PHOTONICS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Mohsen Khalily, Okan Yurduseven, Tie Jun Cui, Yang Hao, George Eleftheriades
Summary: Surface electromagnetics (SEM), as a sub-discipline of electromagnetic (EM) science, focuses on manipulating electromagnetic waves for controlling reflection, refraction and transmission. SEM has gained significant attention and usage in applications involving microwave, millimeter-wave, terahertz and optical wavelengths.
IEEE COMMUNICATIONS MAGAZINE
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Benjamin Vial, Henry Giddens, Yang Hao
Summary: This paper presents two examples of electromagnetic lenses that demonstrate the advantages of multi-material 3D printing. The first example is a frequency dependent dual focusing lens design using two different dielectric filaments. The second example is a compressed Luneburg lens realized by printing with a total of five different dielectrics.
2022 16TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2022)
