Article
Mathematics, Applied
Yves Capdeboscq, Michael S. Vogelius
Summary: This paper discusses the minimization of anisotropy in cloaking technology using different types of transformations. The study provides evidence that non-radial transformations do not reduce the degree of anisotropy for cloaks with circular boundaries, but may be advantageous for cloaks with non-circular boundaries.
ESAIM-MATHEMATICAL MODELLING AND NUMERICAL ANALYSIS
(2022)
Article
Physics, Multidisciplinary
Yangyang Chen, Michael R. Haberman
Summary: In this study, we utilize gauge transformations to exploit the total displacement field in elastostatic polar Willis solids, allowing simultaneous control of both rigid-body displacement and deformation. We demonstrate how these solids can be realized as lattice metamaterials, breaking minor symmetries of the stiffness tensor and displaying cross coupling between stress and displacement. By designing specific geometries, grounded springs, and coupled gears, we achieve a range of satisfactory and peculiar displacement control functions through numerical simulations. Our work provides an analytical framework for the inverse design of grounded polar Willis metamaterials to achieve arbitrary displacement control functions by design.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
F. Martinez, M. Maldovan
Summary: Metamaterials and devices with cloaking functionalities have the potential to bring fundamental advancements in various fields including invisibility, vibration mitigation, protection, shielding, and isolation. Recent developments in rational material design have allowed the control of electromagnetic waves, mechanical waves, heat, mass, and fluid flow through the design and fabrication of metamaterials and metasurfaces. This review discusses the discovery of new ways to achieve cloaking in light, sound, heat, mass flow, electrical and magnetic fields, and fluid flow, as well as their applications in different physical fields.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Muratcan Ayik, Hamza Kurt, Oleg V. Minin, Igor V. Minin, Mirbek Turduev
Summary: This manuscript presents the design and experimental proof of an optical cloaking structure for concealing a perfectly electric conductor (PEC) object from an incident plane wave in multiple directions. The dielectric modulation around the PEC object is optimized for multi-directional cloaking, and a mirror symmetrized slice is used to achieve the multi-directional effect. The 3D finite-difference time-domain method is combined with genetic optimization for the cloaking design. Experimental validation is conducted on a scaled model in the microwave range, showing good agreement with numerical results. The proposed design approach is not limited to multi-directional optical cloaking and can be extended to other electromagnetic wave scenarios.
Article
Chemistry, Physical
Fei Wang, Shuming Yang, Shaobo Li, Shuhao Zhao, Biyao Cheng, Chengsheng Xia
Summary: This study successfully obtained high-order near-field optical signals using a platinum-coated optical probe (Pt-Si probe), leading to improved imaging results.
Article
Computer Science, Information Systems
Song Song, Junxian Wu, Yejun Liu, Lei Guo
Summary: Free Space Optical (FSO) communication is studied for its advantages, but it is sensitive to weather and atmospheric turbulence. This letter proposes a simplified Differential Phase Shift Keying (DPSK) modulation scheme with constellation remapping to improve signal transmission performance.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Multidisciplinary Sciences
Huolei Feng, Xingwei Zhang, Yuekai Zhang, Limin Zhou, Yushan Ni
Summary: The designed confocal elliptical core-shell structure can achieve omnidirectional camouflage effect without affecting temperature and electric potential profiles. The composite structure proposed in the study successfully eliminates scattering caused by the elliptical core under different directions, demonstrating omnidirectional thermal-electric camouflage effect experimentally.
Review
Computer Science, Interdisciplinary Applications
Yazhou Wang, Kumar Tamma, Dean Maxam, Tao Xue, Guoliang Qin
Summary: This paper investigates high-order algorithms for time discretization, focusing on high-order implicit/explicit algorithm designs. Five high-order unconditionally stable implicit algorithms are derived, and a novel explicit numerical framework is proposed for achieving high solution accuracy with comparable stability region.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Can Li, Yin Zhuang, Wenchao Liu, Shan Dong, Hailin Du, He Chen, Boya Zhao
Summary: In this letter, an effective multiscale residual network with a high-order feature representation (MRHNet) is proposed to address the rotation, multiscale feature extraction, and low interclass diversity problems in optical remote sensing scene classification. Extensive experiments show that MRHNet can achieve superior performances.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Computer Science, Information Systems
Lin Xiao, Haiyan Tan, Jianhua Dai, Lei Jia, Wensheng Tang
Summary: This paper focuses on solving time-varying linear matrix equations using high-order neural network models, which are designed based on high-order error functions and nonlinear activation functions. Numerical simulations demonstrate that the proposed high-order ZNN models have superior convergence properties compared to first-order ZNN models for solving TVLMEs.
INFORMATION SCIENCES
(2021)
Article
Astronomy & Astrophysics
Kazufumi Takahashi
Summary: In this paper, a generalization of invertible disformal transformations involving arbitrary higher-order covariant derivatives of the scalar field is constructed, resulting in a more general class of ghost-free scalar-tensor theories than ever.
Article
Materials Science, Multidisciplinary
Jintao Gong, Lingxing Xiong, Mingbo Pu, Yifeng Wen, Jixiang Cai, Xingdong Feng, Rui Pan, Qiong He, Yinghui Guo, Nan Chi, Xiaoliang Ma, Xiong Li, Xiangang Luo
Summary: Considerable effort has been made to research reconfigurable beam focusing and optical cloaking using metamaterials/metasurfaces. This study proposes a novel strategy to control wavefronts on curved platforms by curving a flexible metasurface. The metasurface is fabricated using UV-NIL and its effectiveness is verified through simulation and experiments. The curved metasurface is designed to achieve multifunctional performance and a theoretical scheme is proposed for projecting a curved surface onto a reference plane. Furthermore, experimental characterization confirms the feasibility and effectiveness of the proposed strategy.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Analytical
Yuri Hayashi Isayama, Hugo Enrique Hernandez-Figueroa
Summary: A generalization of multimode interference sensors was presented for the first time in this study, which led to the development of new criteria for designing more sensitive structures. A novel structure was also developed to overcome challenges in exciting high-order modes and interpreting output signals, resulting in the design of the most sensitive multimode interference sensor reported so far.
Article
Mathematics, Applied
Ling Ling, Guanghui Li, Xiaoyuan Zhu, Chongqi Zhang
Summary: This paper investigates the R-optimal design problem considering a mixture model with qualitative factors, specifically when the levels of the qualitative factor interact with the mixture factors. The conditions for R-optimality of such designs are presented, along with general analytical expressions for the decision function, in order to verify the compliance with the general equivalence theorem. The relative efficiency of the R-optimal design is also discussed.
Article
Optics
Arafa H. Aly, Samar M. Shaban, Ahmed Mehaney
Summary: Effective confinement of light and sound is achieved through a one-dimensional phoxonic crystal (PxC) cavity, which allows for a much stronger photon-phonon interaction. By introducing a defect into a multilayer PxC, co-localization of gigahertz phonons and infrared photons is achieved, leading to the study of the acousto-optic effect. The design of cavities with high-quality factors for both photon and phonon resonances can open the way to study the properties of linear elastic materials for designing extremely miniaturized acousto-optic devices.
Article
Materials Science, Multidisciplinary
Soham Saha, Aveek Dutta, Clayton DeVault, Benjamin T. Diroll, Richard D. Schaller, Zhaxylyk Kudyshev, Xiaohui Xu, Alexander Kildishev, Vladimir M. Shalaev, Alexandra Boltasseva
Summary: Modulation of dielectric permittivity enables control over the phase, amplitude, and polarization of light, crucial for tunable optical devices. This study reports significant permittivity changes induced by optically generated free carriers in zinc oxide thin films, with up to 70% broadband reflectance modulation in metal-backed mirrors.
Article
Computer Science, Interdisciplinary Applications
Qing Xia, Jeffrey W. Banks, William D. Henshaw, Alexander Kildishev, Gregor Kovacic, Ludmila J. Prokopeva, Donald W. Schwendeman
Summary: In this paper, a fourth-order accurate finite-difference time-domain scheme is described for solving dispersive Maxwell's equations with nonlinear multi-level carrier kinetics models. The scheme is based on a single-step three time-level modified equation approach and does not require nonlinear iterations. It can accurately treat curved interfaces between different materials and complex geometry using curvilinear grids and overset grids respectively. The numerical model obtained from this scheme is carefully verified and can be used for plasmonic applications such as nanolasing.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Zhaxylyk A. Kudyshev, Alexander V. Kildishev, Vladimir M. Shalaev, Alexandra Boltasseva
Summary: The Starshot lightsail project aims to build an ultralight spacecraft that can reach Proxima Centauri b in 20 years with propulsion from a high-power laser array. The project imposes extreme requirements on the lightsail's optical, mechanical, and thermal properties. The framework developed can optimize the lightsail's optical and opto-kinematic properties, opening up pathways to a multi-objective optimization of the entire lightsail propulsion system.
Article
Computer Science, Interdisciplinary Applications
Ludmila J. Prokopeva, Samuel Peana, Alexander Kildishev
Summary: This study presents an approach for adapting Gaussian dispersion analysis (GDA) to time-domain simulations, allowing efficient modeling of optical materials. The research develops a simplified model for materials with inhomogeneous broadening, and implements it in a finite-difference time domain (FDTD) solver. The use of causal Dawson-Gauss oscillators and a generalized dispersive material (GDM) model enables accurate and efficient simulation of light propagation in dispersive media.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Soham Saha, Mustafa Goksu Ozlu, Sarah N. Chowdhury, Benjamin T. Diroll, Richard D. Schaller, Alexander Kildishev, Alexandra Boltasseva, Vladimir M. Shalaev
Summary: The unique properties of emerging photonic materials, conducting nitrides and oxides, are explored in this study. The optical properties of polycrystalline titanium nitride and aluminum-doped zinc oxide can be controlled by tailoring the film thickness. The study demonstrates their potential for ENZ-enhanced photonic applications, including optical circuitry, tunable metasurfaces, and nonlinear optical devices.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yuhao Wu, Sarah N. Chowdhury, Lei Kang, Soham S. Saha, Alexandra Boltasseva, Alexander V. Kildishev, Douglas H. Werner
Summary: By exploiting the extreme light confinement observed in periodic photonic structures and the dynamic material properties of zinc oxide (ZnO), this study presents a hybrid metasurface with broadly tunable topological properties. The results demonstrate that this metasurface can greatly manipulate the polarization of near-infrared light and has the potential to be used in all-optical switchable devices.
Article
Optics
Colton Fruhling, Kang Wang, Sarah Chowdhury, Xiaohui Xu, Jeffrey Simon, Alexander Kildishev, Letian Dou, Xiangeng Meng, Alexandra Boltasseva, Vladimir M. Shalaev
Summary: Coherent random lasing in subwavelength quasi-2D perovskite films is observed and studied. Statistical analysis reveals Levy-like intensity fluctuations, replica symmetry breaking confirms random lasing, and spectral and spatial correlation techniques are used to study coherent modes. The observed coherent lasing modes are extended states that result from the random crystal grain structure during fabrication and out-compete diffusive lasing due to their coherence.
LASER & PHOTONICS REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Omer Yesilyurt, Samuel Peana, Vahagn Mkhitaryan, Karthik Pagadala, Vladimir M. M. Shalaev, Alexander V. V. Kildishev, Alexandra Boltasseva
Summary: This work proposes a neural network based inverse design technique for the realistic design and fabrication of single material variable-index multilayer films. By integrating simulated systematic and random errors, the same neural network that produced the ideal designs can be retrained to compensate for deposition errors and fabrication imperfections. This approach provides a practical and experimentally viable method for designing high-performance single material multilayer films for a wide range of applications.
Article
Multidisciplinary Sciences
Zhaxylyk A. Kudyshev, Demid Sychev, Zachariah Martin, Omer Yesilyurt, Simeon I. Bogdanov, Xiaohui Xu, Pei-Gang Chen, Alexander V. Kildishev, Alexandra Boltasseva, Vladimir M. Shalaev
Summary: One of the main characteristics of optical imaging systems is spatial resolution, which is restricted by the diffraction limit. Recently, classical and quantum super-resolution techniques have been developed to break the diffraction limit. We propose a machine learning-assisted approach for rapid antibunching super-resolution imaging, achieving a 12 times speed-up compared to conventional methods. This framework enables the practical realization of scalable quantum super-resolution imaging devices compatible with various quantum emitters.
NATURE COMMUNICATIONS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Zhaxylyk A. Kudyshev, Demid Sychev, Zachariah Martin, Simeon Bogdanov, Xiaohui Xu, Alexander Kildishev, Alexandra Boltasseva, Vladimir M. Shalaev
Summary: The machine-learning assisted framework significantly speeds up image acquisition in super-resolution microscopy based on photon antibunching, compatible with a CW excitation regime and applicable to a wide range of quantum emitters.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Omer Yesilyurt, William D. Henshaw, Ludmila J. Prokopeva, Samuel Peana, James Lawrence Stewart, Alexander Kildishev
Summary: Anisotropic homogenization for optically thick metasurfaces has been demonstrated, showing high accuracy in retrieved BA parameters using a BA-compatible Maxwell solver. This method homogenizes arbitrarily thick metasurface unit cells by dividing and treating individual layers in the propagation direction.
2021 INTERNATIONAL APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY SYMPOSIUM (ACES)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Omer Yesilyurt, William D. Henshaw, Ludmila J. Prokopeva, Samuel Peana, James Lawrence Stewart, Alexander Kildishev
Summary: The study demonstrates a method for bianisotropic homogenization of optically thick metasurfaces. By dividing the unit cell in the propagation direction and treating individual layers, arbitrarily thick metasurface unit cells can be homogenized. The accuracy of the retrieved parameters is tested using a BA-compatible Maxwell solver, with results showing high accuracy for the retrieved BA parameters.
2021 INTERNATIONAL APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY SYMPOSIUM (ACES)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Ludmila J. Prokopeva, Samuel Peana, Alexander Kildishev
Summary: In the field of electromagnetics, material dispersion is commonly modeled as a collection of Lorentzian oscillators and Debye relaxations. However, in realistic engineered materials, absorption rarely follows the ideal Lorentzian shape and is often significantly broadened by statistical effects. To address this issue, researchers have developed a new time-domain compatible Lorentz-Gaussian model to simulate the broadening effect.
2021 INTERNATIONAL APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY SYMPOSIUM (ACES)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Qing Xia, Jeffrey W. Banks, William D. Henshaw, Alexander Kildishev, Gregor Kovacic, Ludmila J. Prokopeva, Donald W. Schwendeman
Summary: Efficient and high-order accurate FDTD schemes are developed for nonlinear dispersive models in active multi-level media with material interfaces in arbitrary 2D and 3D geometries. The schemes allow for compact stencils in time integration and efficient point-wise update of numerical solutions, making them suitable for modeling active media with various properties.
2021 INTERNATIONAL APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY SYMPOSIUM (ACES)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Zahra Manzoor, Omer Yesilyurt, Dimitrios Peroulis, Alexander Kildishev
Summary: By exciting resonators with more complex near-field current sources instead of a single loop or patch, stronger supercavity modes can be achieved, leading to at least a three times higher Q-factors compared to conventional techniques.
2021 INTERNATIONAL APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY SYMPOSIUM (ACES)
(2021)
