Article
Computer Science, Information Systems
Rafat Aljarrah, Murad Al-Omary, Dua'a Alshabi, Qusay Salem, Sahban Alnaser, Dragan Cetenovic, Mazaher Karimi
Summary: The integration of power electronics-based renewable energy sources into the power system has changed the traditional levels and characteristics of fault currents. Accurate estimation of fault currents is crucial for the operation of renewable-rich power systems. This paper proposes the use of an artificial neural network-based tool to estimate short circuit currents in power systems with high penetration of power electronics-based renewables. The approach is demonstrated to accurately estimate the components of short circuit currents based on the penetration level of renewables in a modified IEEE 9-bus test system.
Article
Chemistry, Multidisciplinary
Yuanwei Li, Ibrahim Tanriover, Wenjie Zhou, Wisnu Hadibrata, Sina Abedini Dereshgi, Devleena Samanta, Koray Aydin, Chad A. Mirkin
Summary: A synthetic strategy for preparing ultrathin, broadband metasurface absorbers is reported, which involves the surface-assembly of plasmonic octahedral nanoframes into large-area ordered monolayers. The resulting absorbers exhibit efficient light absorption across a wide range of wavelengths and are unaffected by polarization and incidence angles.
Article
Optics
Feifei Liu, Dongyi Wang, Han Zhu, Xiyue Zhang, Tong Liu, Shulin Sun, Xinping Zhang, Qiong He, Lei Zhou
Summary: A generic approach for designing plasmonic lenses to generate predesigned vector surface plasmon polaritons (SPPs) vortices with high efficiencies is established. The devices, constructed with tailored meta-atoms, can convert normally incident circularly polarized light into desired vector SPP vortices due to phase and polarization matching. Experimental demonstrations of directional SPP conversion (coupling efficiency: 35%; utilization efficiency: 98%) and enhanced efficiency in generating vector SPP vortex pave the way for on-chip plasmonic devices to efficiently utilize SPPs with minimal footprints.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Multidisciplinary
Ahmed Nagaty, Arafa H. Aly, Walied Sabra
Summary: This paper explores the design of absorbers using plasmonic metasurfaces in the visible spectrum and presents a comparison between different nanoantennas. The results show that using titanium nitride nanoantennas in plasmonic metasurfaces achieves higher absorption compared to other nanoantennas. This technique provides a promising method for designing preoptimized absorbers for practical applications such as sensing, thermal management, and solar cells.
Article
Chemistry, Multidisciplinary
Zhangjie Luo, Xueyao Ren, Lin Zhou, Yu Chen, Qiang Cheng, Hui Feng Ma, Tie Jun Cui
Summary: This article proposes a novel nonlinear-absorbing metasurface that targets spatial waves. By improving the impedance match between the metasurface and free space, the absorption of strong waves is enhanced, protecting weak signals from interference. Experimental results demonstrate the wide incident angle scope, dual polarizations, and wide instantaneous bandwidth.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Bahareh Amini, Zahra Atlasbaf
Summary: This paper presents an efficient circuit model of functional thin-film graphene-assisted metamaterial devices and verifies its accuracy using MATLAB code and Finite Element Method. Two new broadband graphene metasurface absorbers at terahertz frequencies are proposed, and their circuit models are extracted and validated. The suggested method is easy to apply to other subwavelength structures in a wide frequency range.
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Aboutaleb Haddadi, Evangelos Farantatos, Manish Patel, Ilhan Kocar
Summary: In traditional short circuit models, loads are often omitted due to the high and reactive fault current from synchronous generators. However, inverter-based resources (IBRs) in the grid can have fault currents comparable to load currents, which may cause inaccuracies in fault analysis and potentially impact relay operations during power system disturbances.
IEEE TRANSACTIONS ON POWER DELIVERY
(2023)
Article
Multidisciplinary Sciences
Xing Liu, Xiaochen Zhang, Weikang Dong, Qinghua Liang, Chang-Yin Ji, Jiafang Li
Summary: By adding an out-of-plane degree of freedom to the double split-ring resonators (DSRR), the nano-kirigami method enables broadband and high-efficiency linear polarization conversion in the near-infrared wavelength range. The polarization conversion ratio (PCR) of more than 90% is achieved in a wide spectral range by transforming the two-dimensional DSRR precursors into 3D counterparts. The high-performance and broadband PCR can be tailored by adjusting the vertical displacement or structural parameters.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
Esteban S. Pulido, Luis A. Moran, Jose J. Silva, Isaac Gonzalez-Torres, Jaime A. Rohten, Felipe A. Villarroel, Jose R. Espinoza
Summary: This article introduces a new concept for actively reducing short-circuit currents in power distribution grids and experimentally verifies its feasibility. The new configuration uses a specific power converter to attenuate the fault current and successfully demonstrates its effectiveness in the tests.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Chenchen Wang, Jinling Zhang, Shuobing Bai, Xiongzhi Zhu, Zhanqi Zheng
Summary: This article presents a high-efficiency harmonic suppression metasurface energy collector which improves system conversion efficiency by integrating harmonic suppression function into energy collection metasurface. By eliminating harmonic suppression networks, an 8x8 finite element MS array achieved a conversion efficiency of 96%.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Materials Science, Multidisciplinary
M. A. Butt, S. N. Khonina, N. L. Kazanskiy, R. Piramidowicz
Summary: This work presents a comprehensive study of the sensing capabilities of a hybrid metasurface perfect absorber (HMSPA) based on square meta-atoms (S-MAs) and hollow-square meta-atoms (HS-MAs). Both designs show high absorption rates in the narrowband region, making them suitable for filtering applications. The HMSPA with HS-MAs is particularly sensitive to variations in the refractive index, which is ideal for biosensing applications. Additionally, the deposition of a temperature-sensing material on the metasurface enables temperature sensing. The proposed HMSPA structures have potential applications in filtering, biosensing, and temperature sensing.
Article
Engineering, Electrical & Electronic
Junxiao Liu, Yunxin Tan, Dainan Zhang, Qiye Wen, Yulong Liao, Zhiyong Zhong, Tianlong Wen
Summary: A nanocomposite with a light-responsive dielectric constant was prepared using a template printing method. The dielectric constant of the nanocomposite can be effectively tuned by laser illumination, enabling dynamic modulation of absorption peak. A tunable broadband absorber was obtained by double printing, showing immense potential in THz absorption and other THz functional devices.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Elisa Sani, Diletta Sciti, Simone Failla, Cesare Melandri, Alessandro Bellucci, Stefano Orlando, Daniele M. Trucchi
Summary: By using femtosecond laser machining, this study demonstrates the successful enhancement of solar absorptance in tantalum boride, which has significant implications for Concentrating Solar Power.
Article
Chemistry, Multidisciplinary
Wenbing Liu, Lirong Huang, Jifei Ding, Chenkai Xie, Yi Luo, Wei Hong
Summary: Asymmetric optical transmission is crucial in many optical systems. In this study, a dielectric-metal metasurface is introduced to achieve high-performance asymmetric transmission for linearly polarized light in the near-infrared region. The metasurface supports a forward transmittance peak and a backward transmittance dip at the same wavelength of 922 nm, significantly enhancing operation bandwidth and contrast ratio.
Article
Nanoscience & Nanotechnology
Meng-Ju Yu, Chih-Li Chang, Hao-Yu Lan, Zong-Yi Chiao, Yu-Chia Chen, Ho Wai Howard Lee, Yia-Chung Chang, Shu-Wei Chang, Takuo Tanaka, Vincent Tung, Ho-Hsiu Chou, Yu-Jung Lu
Summary: Research has shown that a titanium nitride metasurface absorber demonstrates broadband absorption with over 92% average absorption in the wavelength range of 400 to 750 nm, attributed to localized surface plasmon resonance. By integrating this technology with a polymer photocatalyst, a 300% increase in hydrogen evolution rate was observed due to enhanced rates of light absorption, carrier separation, and hot-carrier transfer, providing a new approach for high-efficiency solar energy harvesting systems.
Article
Chemistry, Multidisciplinary
Hiroki Wakatsuchi, Jiang Long, Daniel F. Sievenpiper
ADVANCED FUNCTIONAL MATERIALS
(2019)
Article
Engineering, Electrical & Electronic
H. Wakatsuchi
ELECTRONICS LETTERS
(2019)
Article
Engineering, Electrical & Electronic
D. Ushikoshi, M. Tanikawa, K. Asano, K. Sanji, M. Ikeda, D. Anzai, H. Wakatsuchi
ELECTRONICS LETTERS
(2020)
Article
Physics, Applied
Kosei Asano, Tomoyuki Nakasha, Hiroki Wakatsuchi
APPLIED PHYSICS LETTERS
(2020)
Article
Multidisciplinary Sciences
Ryoya Aihara, Hiroki Wakatsuchi
SCIENTIFIC REPORTS
(2020)
Article
Multidisciplinary Sciences
Mizuki Tanikawa, Daiju Ushikoshi, Kosei Asano, Kenichiro Sanji, Masakazu Ikeda, Daisuke Anzai, Hiroki Wakatsuchi
SCIENTIFIC REPORTS
(2020)
Article
Multidisciplinary Sciences
Tomoyuki Nakasha, Sendy Phang, Hiroki Wakatsuchi
Summary: Linear metasurfaces have been shown to exhibit waveform-selective responses, while nonlinear metasurfaces offer more flexibility in addressing electromagnetic challenges involving waves at the same frequency. The waveform-selective responses in linear structures are derived from dispersion behaviors, referred to as pseudo-waveform-selective metasurfaces.
ADVANCED THEORY AND SIMULATIONS
(2021)
Article
Nanoscience & Nanotechnology
Haruki Homma, Muhammad Rizwan Akram, Ashif Aminulloh Fathnan, Jiyeon Lee, Christos Christopoulos, Hiroki Wakatsuchi
Summary: By embedding controllable transient circuits, tunable anisotropic impedance surfaces can be achieved to control surface wave propagation based on the incident waveform.
Article
Physics, Applied
Ashif Aminulloh Fathnan, Haruki Homma, Shinya Sugiura, Hiroki Wakatsuchi
Summary: By modeling a metasurface as time-varying admittance sheets, an analytical calculation method is provided to predict the metasurface time-domain responses, allowing the derivation of design specifications in the form of equivalent sheet admittance. Using this method, a waveform-selective Fresnel zone plate with variable focal length depending on the incoming pulse width is synthesized. The proposed synthesis method can be extended to design metasurfaces with more complex spatiotemporal wave manipulation, benefiting applications such as sensing, wireless communications, and signal processing.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Masaya Tashiro, Ashif Aminulloh Fathnan, Yuta Sugiura, Akira Uchiyama, Hiroki Wakatsuchi
Summary: The authors present metasurface-inspired maintenance-free IoT tags that can be characterized by both frequency-domain and time-domain profiles. The waveform-selective mechanisms of circuit-based metasurfaces allow the tags to behave differently at the same frequency based on the pulse duration of the incident wave. The proposed designs are validated numerically and experimentally, and potentially contribute to increasing the capacity of IoT tags within a single wireless network while reducing maintenance effort.
ELECTRONICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Daiju Ushikoshi, Riku Higashiura, Kaito Tachi, Ashif Aminulloh Fathnan, Suhair Mahmood, Hiroki Takeshita, Haruki Homma, Muhammad Rizwan Akram, Stefano Vellucci, Jiyeon Lee, Alessandro Toscano, Filiberto Bilotti, Christos Christopoulos, Hiroki Wakatsuchi
Summary: Metasurface-based antennas can adjust antenna performances according to the time width of electromagnetic pulses, which advances the design of antennas and wireless communication environments. The proposed concept goes beyond conventional performance and can be applied for sensing, selective reception, and mutual communications based on pulse width, thus expanding existing frequency resources.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Shiori Imai, Haruki Homma, Kairi Takimoto, Mizuki Tanikawa, Jin Nakamura, Masaya Kaneko, Yuya Osaki, Kiichi Niitsu, Yongzhi Cheng, Ashif Aminulloh Fathnan, Hiroki Wakatsuchi
Summary: This study demonstrates numerically that the response of circuit-based metasurfaces can be characterized by their circuit parameters. The metasurfaces, consisting of a four-diode full wave rectifier, can sense different waves based on the incident waveform, specifically the pulse width. The study reveals the relationship between the electromagnetic response of waveform-selective metasurfaces and the SPICE parameters of the diodes used, providing design guidelines for optimal diodes selection and enhancing performance in various applications.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
Yongzhi Cheng, Yingjie Qian, Haruki Homma, Ashif Aminulloh Fathnan, Hiroki Wakatsuchi
Summary: In this study, two types of waveform-selective microwave metasurface absorbers (MMAs) were numerically and experimentally demonstrated. By designing specific circuit and geometrical parameters, these absorbers can selectively absorb signals of specific waveforms at the same frequencies, including higher-order modes. These waveform-selective MMAs have a wide range of applications in electromagnetic shielding, detection, sensing, and wireless communications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Nanoscience & Nanotechnology
Kairi Takimoto, Hiroki Takeshita, Ashif Aminulloh Fathnan, Daisuke Anzai, Shinya Sugiura, Hiroki Wakatsuchi
Summary: We propose a novel concept of metasurface filters that can selectively extract pulsed waveforms at a constant frequency from complex superimposed input signals. Our filters overcome the challenge of eliminating unnecessary pulses under simultaneous incidence without relying on commonly used modulation schemes. By integrating waveform-selective metasurface unit cells with delay lines and interference cancellation processes, our concept allows for simultaneous filtering and can be extended to incorporate broadband signals and other modulation scheme variables. This study opens up new possibilities for controlling electromagnetic waves and has potential applications in wireless power transfer and communications.
Article
Physics, Applied
Hiroki Takeshita, Daisuke Nita, Yongzhi Cheng, Ashif Aminulloh Fathnan, Hiroki Wakatsuchi
Summary: In this study, a design method for waveform-selective metasurface absorbers operating in multiple frequency bands is presented and validated through numerical and experimental verification. The method allows the absorbers to preferentially absorb target electromagnetic waves of the same frequency based on the incident waveform, specifically the pulse width. By adjusting the spatial ratio of unit cells assigned to different frequencies, the performance of the dual-band approach is enhanced. This study opens up possibilities for the utilization of waveform-selective metasurfaces in diverse frequency bands, providing a valuable and versatile solution for various applications.
APPLIED PHYSICS LETTERS
(2023)
