Article
Engineering, Civil
Feng Li, Xuan Sun, Siqi Zhou, Yuhang Chen, Zhibin Hao, Zhanning Yang
Summary: This paper investigated the impact of pavement material magnetization on resonant inductive coupling in wireless power transfer systems. The experiment revealed that the magnetization properties of pavement materials altered the active power and efficiency of the system. Adjusting component parameters and waterproofing between pavement layers can help mitigate the effects of magnetization and environmental factors on power transfer efficiency.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Lei Zhu, Laili Wang, Min Wu, Chenxu Zhao, Longyang Yu
Summary: The power and efficiency of wireless power transfer (WPT) systems are limited by the quality factor and coupling coefficient of the transmitting and receiving coils. Self-resonant coils, with their simple structure, high system reliability, high quality factor, and high power level, are promising for WPT applications. To accurately calculate the self-resonant frequency and current distribution of helical coils, a partial-element equivalent circuit (PEEC) method is applied. The proposed model is validated through simulation and measurement, and a new design guideline for self-resonant helical coils is proposed.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Eleni Demarchou, Constantinos Psomas, Ioannis Krikidis
Summary: This research investigates the performance of a single cell MRC-WPT network with multiple receivers and proposes methods to optimize the harvested power through pre-adjusted loads and a non-cooperative game.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Mechanical
Yuji Ishino, Takeshi Mizuno, Masaya Takasaki
Summary: A three-degree-of-freedom AC magnetic suspension system using magnetic resonant coupling was fabricated, which can produce restoring force without active control. The system is dynamically stabilized by adding indirect damping, and non-contact electrical power transmission is achieved simultaneously.
Article
Computer Science, Information Systems
Quan Sheng, Jingni Geng, Zheng Chang, Aihua Wang, Meng Wang, Shijie Fu, Wei Shi, Jianquan Yao
Summary: Wireless power transfer using a distributed laser resonator has potential for adaptive operation without alignment. In this study, we demonstrated an alignment-free laser with a large dynamic range for wireless power transfer. We obtained efficient optical and electrical outputs across different working distances and viewing angles. This research paves the way for practical applications in charging and communication for Internet of Things devices.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Energy & Fuels
Yingqin Zeng, Conghui Lu, Cancan Rong, Xiong Tao, Xiaobo Liu, Renzhe Liu, Minghai Liu
Summary: Utilizing metamaterials to enhance the power transfer efficiency in wireless power transfer systems, this study proposed the use of two MM slabs to improve magnetic coupling. Experimental results demonstrated that using two MM slabs can significantly enhance power transmission capability compared to using one MM slab, leading to a substantial improvement in PTE at mid-range distances.
Article
Multidisciplinary Sciences
Thanh Son Pham, Thao Duy Nguyen, Bui Son Tung, Bui Xuan Khuyen, Thu Trang Hoang, Quang Minh Ngo, Le Thi Hong Hiep, Vu Dinh Lam
Summary: In this study, the efficiency of a magnetic resonant wireless power transfer (MR-WPT) in conducting medium was investigated, and an optimal frequency for designing the system was found. It was observed that the efficiency of MR-WPT systems operating at 20.0 MHz and 10.0 MHz varied depending on the conductivity of the medium.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Wen Fang, Hao Deng, Qingwen Liu, Mingqing Liu, Qingwei Jiang, Liuqing Yang, Georgios B. Giannakis
Summary: The article introduces an analytical model for evaluating the safety of the Resonant Beam Charging system, demonstrating its capability to achieve safe and efficient wireless power transfer at Watt-level power over long distances, while meeting necessary safety requirements for human skin exposure.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Yunfeng Bai, Qingwen Liu, Liuqing Yang, Georgios B. B. Giannakis, Wen Fang, Mingliang Xiong
Summary: In this paper, a RB-SWIPT scheme is proposed for mobile devices, which utilizes TIM and SHG to enhance transmission and reduce interference. Numerical results show that the proposed system can achieve a spectral efficiency of 18 bit/s/Hz and deliver 8 W power over a distance of 100 m.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Computer Science, Information Systems
Yashwanth Bezawada, Shirshak K. Dhali
Summary: A novel capacitive wireless power transfer system using 8-plate multi-resonant coupling was proposed to minimize the effects of misalignment and improve efficiency. Hardware results showed that this system achieved 88.5% efficiency in a 20.8W test, which was 18.3% higher than a regular 4-plate coupling, and reduced the output voltage drop by 15% for a 10% misalignment.
Article
Engineering, Electrical & Electronic
Meng Wang, Haoran Wang, Yiming Zhang, Yanyan Shi, Lan Yang
Summary: By investigating the operation characteristics of a conformal coplanar four-coil magnetic resonant coupling wireless power transfer system under four different resonant states, it is found that operating under State 1, where compensated serial capacitance allows coils to work at the frequency of maximum Q-factor, shows the best transfer characteristic. The transmission coefficient can be maintained above 0.8 within a 30 cm transfer distance, indicating better power delivery to the load compared to other states.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2021)
Review
Computer Science, Information Systems
Feifan Xu, Shuguang Wei, Dong Yuan, Jiaqi Li
Summary: This paper reviews the magnetic coupling resonant-dynamic wireless power transfer (MCR-DWPT) system of unmanned ground vehicles (UGVs) and discusses the key technologies including coupling device design, compensation topology design, and system control strategy. The main challenges and future prospects of MCR-DWPT for UGVs are explored based on current research.
Article
Chemistry, Analytical
Emmanuel Ahene, Mark Ofori-Oduro, Frimpong Twum, Joojo Walker, Yaw Marfo Missah
Summary: Chaos theory combined with cryptography has significant applications in industrial processes and wireless power transfer systems. Authentication protocols are crucial for safe charging. Future research should focus on exploring more challenges in this field.
Article
Instruments & Instrumentation
Erik Andersen, Shad Roundy, Binh Duc Truong
Summary: The study investigates the frequency dependence of the maximum output power and efficiency of two wireless power transfer systems, resonant inductive coupling (RIC) and magnetoelectric (ME). The results show that in the weak-coupling regime, the power optimization and efficiency maximization problems are equivalent and yield the same optimal load and frequency, with both topologies exhibiting similar properties.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Electrical & Electronic
Maryam Heidarian, Samuel J. Burgess
Summary: Power transfer efficiency (PTE) is a key performance parameter in the development of resonant inductive power transfer (IPT) systems. A new figure-of-merit (FoM), called the strong coupling factor (P-scf), is proposed to find an optimum coil geometry for maximizing PTE.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Review
Nanoscience & Nanotechnology
Sergey G. Menabde, Jacob T. Heiden, Joel D. Cox, N. Asger Mortensen, Min Seok Jang
Summary: Polaritonic modes in low-dimensional materials enable strong light-matter interactions and the manipulation of light on nanometer length scales. The recent interest in image polaritons in van der Waals crystals has gained considerable attention in nanophotonics, where a polaritonic material couples with its mirror image in close proximity to a highly conductive metal. These image modes provide an appealing nanophotonic platform with lower propagation loss and access to the nonlocal regime of light-matter interaction.
Article
Chemistry, Multidisciplinary
Saskia Fiedler, P. Elli Stamatopoulou, Artyom Assadillayev, Christian Wolff, Hiroshi Sugimoto, Minoru Fujii, N. Asger Mortensen, Soren Raza, Christos Tserkezis
Summary: Cathodoluminescence spectroscopy in an electron microscope is a versatile tool for analyzing the optical response of plasmonic and dielectric nanostructures. However, the transition radiation produced by electron impact is often neglected. This study demonstrates that transition radiation can generate distinct resonances that interfere constructively or destructively depending on the electron beam's time-of-flight inside the nanosphere, leading to distorted spectra and potentially erroneous modal assignment.
Article
Optics
Antton Babaze, Eduardo Ogando, P. Elli Stamatopoulou, Christos Tserkezis, N. Asger Mortensen, Javier Aizpurua, Andrei G. Borisov, Ruben Esteban
Summary: In this study, time-dependent density functional theory (TDDFT) was used to investigate the impact of quantum-mechanical effects on the self-interaction Green's function, which governs the electromagnetic interaction between quantum emitters and plasmonic metallic nanoantennas. The results reveal that quantum effects, such as surface-enabled Landau damping and the spill out of induced charges, strongly influence the nanoantenna-emitter interaction, leading to a redshift and broadening of plasmonic resonances. These effects are not considered in classical theories that assume a local dielectric response of the metals.
Article
Multidisciplinary Sciences
Sergejs Boroviks, Zhan-Hong Lin, Vladimir A. Zenin, Mario Ziegler, Andrea Dellith, P. A. D. Goncalves, Christian Wolff, Sergey Bozhevolnyi, Jer-Shing Huang, N. Asger Mortensen
Summary: Nonlocal effects in propagating gap surface plasmon modes in ultrathin metal-dielectric-metal planar waveguides are investigated using scanning near-field optical microscopy. Experimental results show the signatures of nonlocal damping in few-nanometer-sized dielectric gaps.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Sergey G. Menabde, Sergejs Boroviks, Jongtae Ahn, Jacob T. Heiden, Kenji Watanabe, Takashi Taniguchi, Tony Low, Do Kyung Hwang, N. Asger Mortensen, Min Seok Jang
Summary: This research uses large-area monocrystalline gold flakes as a low-loss substrate for image polaritons, accurately measures the complex propagation constant of polaritons in van der Waals crystals, and finds that the propagation loss and normalized propagation length of image phonon-polaritons have specific spectral dependencies.
Article
Materials Science, Multidisciplinary
Sergey G. Menabde, Junghoon Jahng, Sergejs Boroviks, Jongtae Ahn, Jacob T. Heiden, Do Kyung Hwang, Eun Sung Lee, N. Asger Mortensen, Min Seok Jang
Summary: Orthorhombic molybdenum trioxide (alpha-MoO3) is a polaritonic van der Waals crystal with strongly anisotropic mid-infrared phonon-polaritons. The coupling of polariton with its mirror image in an adjacent metal leads to a more confined image mode. This research measures the propagation constant of image phonon-polaritons in alpha-MoO3 using monocrystalline gold flakes as a substrate, demonstrating the long lifetime and propagation length of these polaritons.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Sergii Morozov, Stefano Vezzoli, Alina Myslovska, Alessio Di Giacomo, N. Asger Mortensen, Iwan Moreels, Riccardo Sapienza
Summary: Giant shell CdSe/CdS quantum dots exhibit high brightness and flexibility, with near-unity quantum yield and suppressed blinking. However, their single photon purity is reduced due to efficient multiexcitonic emission. In this study, we observed a significant blueshift in the photoluminescence biexciton spectrum of pure-phase wurtzite quantum dots. By using spectral filtering, we achieved a 2.3 times reduction in biexciton quantum yield while preserving 60% of the exciton single photon emission, leading to an improvement in purity from g2(0)=0.07±0.01 to g2(0)=0.03±0.01. Furthermore, at higher pump fluence, the spectral purification was even more effective, resulting in up to a 6.6 times reduction in g2(0) by suppressing higher order excitons and shell states with larger blueshifts.
Article
Nanoscience & Nanotechnology
Alvaro Rodriguez Echarri, Fadil Iyikanat, Sergejs Boroviks, N. Asger Mortensen, Joel D. Cox, F. Javier Garcia de Abajo
Summary: The promising applications of photonics rely on the fabrication of high-quality metal thin films with controlled thickness in the range of a few nanometers. These materials exhibit highly nonlinear response to optical fields due to ultrafast electron dynamics. However, the understanding of this phenomenon on such small length scales is limited. In this study, a new mechanism controlling the nonlinear optical response of thin metallic films is revealed, which is dominated by ultrafast electronic heat transport when the film thickness is sufficiently small. By experimentally and theoretically studying electronic transport in these materials, the researchers explained the observed temporal evolution of photoluminescence in two-pulse correlation measurements. They found that ultrafast thermal dynamics plays a crucial role in determining the strength and time-dependent characteristics of the nonlinear photoluminescence signal. Their findings provide new insights into the nonlinear optical response of nanoscale materials and offer possibilities for controlling and utilizing hot carrier distributions in metallic films.
Article
Materials Science, Multidisciplinary
Saskia Fiedler, Sergii Morozov, Leonid Iliushyn, Sergejs Boroviks, Martin Thomaschewski, Jianfang Wang, Timothy J. Booth, Nicolas Stenger, Christian Wolff, N. Asger Mortensen
Summary: Cathodoluminescence spectroscopy combined with second-order auto-correlation measurements of g(2)(tau) allows for extensive study of the synchronization of photon emitters in low-dimensional structures. Co-existing excitons in two-dimensional transition metal dichalcogenide monolayers serve as a great source of identical photon emitters that can be simultaneously excited by an electron. In this study, we demonstrate large photon bunching with g(2)(0) up to 156 +/- 16 in a tungsten disulfide monolayer (WS2), showing a strong dependence on the electron-beam current. By carefully selecting a simple and compact geometry, such as a thin monocrystalline gold nanodisk, we achieve a record-high bunching g(2)(0) of up to 2152 +/- 236, improving the excitation synchronization and electron-emitter interaction. This approach of controlling electron excitation of excitons in a WS2 monolayer enables the synchronization of photon emitters in an ensemble, which is crucial for advancing light information and computing technologies.
Article
Nanoscience & Nanotechnology
Saskia Fiedler, Sergii Morozov, Danylo Komisar, Evgeny A. A. Ekimov, Liudmila F. F. Kulikova, Valery A. A. Davydov, Viatcheslav N. N. Agafonov, Shailesh Kumar, Christian Wolff, Sergey I. I. Bozhevolnyi, N. Asger Mortensen
Summary: Impurity-vacancy centers in diamond provide a class of robust photon sources with versatile quantum properties. The ensembles of color centers have tunable photon-emission statistics and their emission properties can be controlled by different types of excitation. Electron-beam excitation can synchronize the emitters' excitation and control the second-order correlation function g(2)(0), as confirmed by experimental results in this letter. Such a photon source based on an ensemble of few color centers in a diamond crystal offers a highly tunable platform for room temperature informational technologies.
Article
Optics
Christos Tserkezis, Christian Wolff, Fedor A. Shuklin, Francesco Todisco, Mikkel H. Eriksen, P. A. D. Goncalves, N. Asger Mortensen
Summary: We propose an efficient approach for actively controlling the Rabi oscillations in nanophotonic emitter-cavity analogs based on the presence of an element with optical gain. Inspired by recent developments in parity-time (PT)-symmetry photonics, we show that nano-or microcavities where intrinsic losses are partially or fully compensated by an externally controllable amount of gain offer unique capabilities for manipulating the dynamics of extended (collective) excitonic emitter systems. Furthermore, we show that there is a specific gain value that leads to an exceptional point, where both the emitter and cavity occupation oscillate practically in phase, with occupation numbers that can significantly exceed unity.
Article
Materials Science, Multidisciplinary
Gino Wegner, Dan-Nha Huynh, N. Asger Mortensen, Francesco Intravaia, Kurt Busch
Summary: The paper discusses the impact of an extended model proposed by Halevi on the nonlocal response of plasmonic materials and nanostructures. It reevaluates the Mie scattering coefficients for a cylinder and corresponding plasmon-polariton resonances within this framework. The analysis reveals a nonlocal, collisional, and size-dependent damping term that affects the resonances in the extinction spectrum. The implementation of the Halevi model in the time domain is particularly important for efficient and accurate modeling of nanogap structures and other nanoscale features in nanoplasmonics applications.
Article
Chemistry, Multidisciplinary
P. Elli Stamatopoulou, Sotiris Droulias, Guillermo P. Acuna, N. Asger Mortensen, Christos Tserkezis
Summary: This paper introduces and analyzes the concept of manipulating optical chirality by strongly coupling the optical modes of chiral nanostructures with excitonic transitions in molecular layers or semiconductors. By demonstrating the generation of two spectral branches that retain the object's high chirality density through strong coupling with a nearby excitonic material, the authors propose that post-fabrication manipulation of optical chirality can be achieved. These findings are further verified through simulations of circular dichroism in a realistic chiral architecture.
Article
Optics
F. A. Shuklin, C. Tserkezis, N. Asger Mortensen, C. Wolff
Summary: This study analyzes the emergence of unphysical superluminal group velocities in Su-Schrieffer-Heeger (SSH) parity-time (PT) symmetric chains and explores the origins of this behavior. The analysis reveals that material dispersion is the key factor causing the divergence of group velocities. Restoring causality resolves the issue and sets practical limits on the performance of PT-symmetric systems.
Article
Materials Science, Multidisciplinary
J. C. G. Henriques, N. A. Mortensen, N. M. R. Peres
Summary: We present an analytical expression for the linewidth of the 1s exciton in transition metal dichalcogenides as a function of temperature, with the total linewidth being dominated by contributions from radiative decay, phonon-induced intravalley scattering, and phonon-induced intervalley scattering. By using a variational Ansatz to solve the Wannier equation, we are able to analytically study the excitonic problem and decay dynamics, with results showing good agreement with experimental data and potential applications for predicting linewidth values at different temperatures in excitonic two-dimensional materials.