Article
Materials Science, Multidisciplinary
Jun Zhu, Changsong Wu, Yihong Ren
Summary: The study proposed a metamaterial absorber composed of graphene, and demonstrated that dynamic tuning of the absorption range and absorption bandwidth could be achieved by adjusting the Fermi level of the graphene. This has theoretical and engineering significance in the domains of thermal photo-voltaics, solar cells, and sensors.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Lewis K. Piper, H. Johnson Singh, Jonathan R. C. Woods, Kai Sun, Otto L. Muskens, Vasilis Apostolopoulos
Summary: This study demonstrates a mechanically tunable metasurface perfect absorber that allows precise control over perfect absorption conditions by adjusting the length of the microcavity, achieving significant extinction in the terahertz range.
ADVANCED PHOTONICS RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Xiangbo Ji, Wenzhi Qin, Xuannan Wu, Yao Wang, Fuhua Gao, Liang Wang, Yidong Hou
Summary: This study demonstrates a high-performance Laser Driven Flyer (LDF) by using a perfect metamaterial absorber (PMA) to improve the energy utilization efficiency of light. The designed Ag nanopillar array in anodic aluminum oxide templates greatly reduces the reflectivity of the flyer, resulting in an increased final speed of the flyer generated in the PMA-enhanced LDF approach.
Article
Thermodynamics
Jun Wu, Yasong Sun, Biyuan Wu, Chunlei Sun, Xiaohu Wu
Summary: This article designs and studies a polarization insensitive, broadband and wide-angle perfect metamaterial absorber for solar energy harvesting, which has high absorption rate and large fabrication tolerance. The absorption spectra are consistent with solar spectrum and robust against incident angle changes.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Balu Ashvanth, Bactavatchalame Partibane, Govindanarayanan Idayachandran
Summary: This study presents a novel tunable metamaterial absorber with multiple bands, achieving a multiband absorption response; The absorber tunes absorption bands by controlling the chemical potential of graphene, providing tunable absorption characteristics in the optical regime.
BULLETIN OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Mahdi Rashki, Mohammad Reza Rakhshani
Summary: In this work, an adjustable perfect absorber metamaterial based on vanadium dioxide (VO2) was designed and theoretically investigated. By controlling the electrical conductivity of VO2, the absorption can be continuously adjusted from 3.92% to 100%. Compared to other published VO2-based terahertz absorbers, this absorber offers a wider bandwidth and flexibility in selecting perfect absorption in the frequency range of 6.5 to 7.90 Thz. Experimental validation was achieved through various physical approaches, and the influence of structure parameters on the absorption spectrum was also investigated. This THz perfect absorber holds great potential for applications such as photochemical energy absorption, modulation, sensing, cloaking, and stealth devices.
Article
Chemistry, Multidisciplinary
Jitendra K. Behera, Kuan Liu, Meng Lian, Tun Cao
Summary: The article presents a reconfigurable HMM perfect absorber based on alternating gold and GST225 layers for the near-infrared region, showing a red-shift of the absorptance peak and omnidirectional, polarization-independent characteristics. The absorptance peak can be reversibly switched in just five nanoseconds by changing the state of GST225.
NANOSCALE ADVANCES
(2021)
Article
Engineering, Electrical & Electronic
A. Beheshti Asl, D. Pourkhalil, A. Rostami, H. Mirtaghioglu
Summary: The proposed metamaterial absorber based on graphene can adjust its center frequency by changing the chemical potential of graphene, and increase the bandwidth by adding more cylinders in the unit cell. The absorber's frequency response is wider and the center frequency is adjustable by increasing the number of graphene layers.
JOURNAL OF COMPUTATIONAL ELECTRONICS
(2021)
Article
Optics
Yan Wang, Yanqing Qiu, Yingping Zhang, Tingting Lang, Fengjie Zhu
Summary: In this study, a perfect metamaterial absorber (PMMA) based on an indium antimonide temperature-sensitive material is designed and investigated in the terahertz region. It shows ideal narrow-band absorption properties with polarization-insensitive and wide-angle absorption. The numerical simulation results demonstrate that the proposed PMMA can function as a temperature sensor with a sensitivity of 21.9 GHz/K. By adding a graphene layer, the temperature sensitivity is increased to 24.4 GHz/K. Due to its excellent performance, the proposed PMMA has potential applications in thermal sensing, detection, and switching.
Article
Chemistry, Multidisciplinary
Joel Y. Y. Loh, Mahdi Safari, Chengliang Mao, Camilo J. Viasus, George Eleftheriades, Geoffrey A. Ozin, Nazir P. Kherani
Summary: Metamaterials are synthetic structures that achieve efficient light absorption by manipulating refractive index, and enhance catalytic reaction rates through intricate optical and plasmonic resonance processes. Compared to nanoparticles or films, metamaterial catalysts exhibit superior photocatalytic performance.
Article
Engineering, Electrical & Electronic
Sevda Seyyedmasoumian, Asma Attariabad, Ali Pourziad, Mohammad Bemani
Summary: This paper presents a metamaterial perfect absorber as a biosensor in the near-infrared region for bio-medical molecular detection. By utilizing a specially designed gold nanohole and graphene layer, the biosensor achieves high sensitivity and compact size, making it suitable for urine concentration, malaria infection, bacteria, and cancer cell detection.
IEEE SENSORS JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Mengqi Liu, Weijin Chen, Guangwei Hu, Shanhui Fan, Demetrios N. Christodoulides, Changying Zhao, Cheng-Wei Qiu
Summary: Perfect absorbers that can completely absorb all incoming energy have been extensively studied and found to be associated with topological spectral phase singularities (SPS). The order of the topological invariant depends on the number of degenerate outgoing channels. By examining mirror-backed and all-dielectric structures, the generation, evolution, and annihilation of SPSs with different orders are revealed. A strategy based on charge conservation of SPSs has been established to design dual-band perfect absorbers. These findings highlight the topological origin of perfect absorption and its potential applications in biosensing, topological metasurfaces, and micro/nano thermal radiation.
Article
Physics, Multidisciplinary
Liying Jiang, Yingting Yi, Yijun Tang, Zhiyou Li, Zao Yi, Li Liu, Xifang Chen, Ronghua Jian, Pinghui Wu, Peiguang Yan
Summary: An ultra-narrowband M-MoS2 metamaterial absorber with significantly improved absorption efficiency was obtained through theoretical analysis and numerical calculation. The resonant wavelength range of the M-MoS2 can be controlled by adjusting the geometric parameters of the structure. This design provides new possibilities for ultra-narrowband M-MoS2 perfect absorbers in the near-infrared spectrum.
Article
Physics, Applied
Weijia Luo, Xubin Wang, Shun Wang, Xueqian Wang, Zetan Liu, Lingxia Li, Fan Hu, Yongzheng Wen, Ji Zhou
Summary: Currently, the miniaturization requirements of microwave or terahertz perfect absorbers using dielectric ceramic-based metamaterials cannot be met due to the low dielectric constant. In this study, we introduced conductivity loss through the carburizing process in order to improve the absorbers, and demonstrated the mechanism using electromagnetic simulation. By establishing a carburizing channel in Ba4Sm9.33Ti18O54 ceramics with an appropriate dielectric constant, the microwave absorbance was doubled and the period was reduced by half compared to pure ceramic-based absorbers. This approach can be extended to various metamaterials using dielectric resonance, offering an effective strategy for device miniaturization and potentially breaking the restrictive relationship between device size and dielectric constant.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Khwanchai Tantiwanichapan, Habibe Durmaz
Summary: The article introduces the use of THz plasmonics and subwavelength scale artificial structures to detect residual herbicides/pesticides. Experimental results show that the THz MMA platform can detect herbicides/pesticides down to 5 ppm. This suggests that the THz MMA platform could be an important method for highly sensitive THz applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Computer Science, Hardware & Architecture
Sepehr Ashtari, Mahrokh Abdollahi, Mehran Abolhasan, Negin Shariati, Justin Lipman
Summary: Wireless cellular networks have evolved to be software-defined, creating opportunities for improving performance. Enabling programming and integration of multi-hop device-to-device (MD2D) at the edge requires an adaptable and scalable routing protocol. A study compared three routing protocols and found that VARP-S and SMDRP perform well in terms of energy consumption and cellular routing overhead, while HSAW excels in terms of end-to-end delay and packet loss for lower network and traffic densities.
COMPUTERS & ELECTRICAL ENGINEERING
(2022)
Article
Engineering, Civil
Mahdi Saki, Mehran Abolhasan, Justin Lipman, Abbas Jamalipour
Summary: In this paper, a novel mobility model is proposed to provide real-time train traffic traces for train-to-train communication models. The model works based on trip timetables without relying on GPS, making it a practical solution for urban areas or tunnels with poor or unavailable GPS signal. The proposed model also incorporates an energy optimization function to guide trains towards efficient operation, and an algorithm to determine contact specifications between trains for data exchange capacity estimation.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Majid Amiri, Mehran Abolhasan, Negin Shariati, Justin Lipman
Summary: This article introduces a new method for soil moisture monitoring and irrigation scheduling using IoT technology, which improves farming efficiency. The designed sensor is able to monitor soil moisture continuously without consuming energy, and provides different humidity level information based on the working states of two rectifiers.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Computer Science, Information Systems
Imran Makhdoom, Mehran Abolhasan, Daniel Franklin, Justin Lipman, Christian Zimmermann, Massimo Piccardi, Negin Shariati Moghadam
Summary: IoT devices, whether connected to the Internet or private networks, are at risk of cyber attacks from external or internal sources. Compromised devices can join botnets and engage in large-scale attacks, compromising data integrity. Existing device attestation methods have limitations in detecting compromised nodes. This study examines current approaches, highlights challenges, and proposes secure and cost-effective attestation protocols.
COMPUTERS & SECURITY
(2023)
Article
Computer Science, Interdisciplinary Applications
Ian Zhou, Justin Lipman, Mehran Abolhasan, Negin Shariati
Summary: This article proposes a frost prediction method based on spatial interpolation, which eliminates the dependency on on-site historical data and sensors. The method utilizes climate data, digital elevation models, and normalized difference vegetation index data to estimate a target site's next hour minimum temperature. Experimental results show that the proposed method achieves a detection rate up to 92.55%.
ENVIRONMENTAL MODELLING & SOFTWARE
(2023)
Article
Computer Science, Information Systems
Muhammad Ahmad Raza, Mehran Abolhasan, Justin Lipman, Negin Shariati, Wei Ni, Abbas Jamalipour
Summary: This article proposes a novel grant-free access scheme using a statistical learning approach in uplink dominant IIoT networks. The scheme allows IIoT entities to perform delay-sensitive and delay-tolerant transmissions over dynamically partitioned resources in a prioritized manner. The simulation results demonstrate that the proposed adaptive network access offers better channel utilization while meeting the application-specific latency bound in IIoT networks.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Rasool Keshavarz, Dan Winson, Justin Lipman, Mehran Abolhasan, Negin Shariati
Summary: In this work, a new dual-band slant-polarized MIMO antenna with HPBW of around 900 is designed, simulated, and measured. Four replicas of the antenna set are placed at four different poles around the vehicle to cover 360° in an omni-directional pattern. The designed antenna system, obtained using a genetic optimization algorithm, shows strong correlation between simulation and measurement results.
2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP
(2023)
Proceedings Paper
Energy & Fuels
Nastouh Nikkhah, Rasool Keshavarz, Mehran Abolhasan, Justin Lipman, Negin Shariati
Summary: This paper presents an efficient dual-band rectifier for radiofrequency energy harvesting applications. The rectifier has high RF-to-DC power conversion efficiency and wideband characteristics, making it suitable for ambient RF energy harvesting and wireless power transfer. It can also work with different load resistors, providing versatility for various applications.
2022 WIRELESS POWER WEEK (WPW)
(2022)
Article
Computer Science, Information Systems
Sepehr Ashtari, Mehran Abolhasan, Justin Lipman, Negin Shariati, Wei Ni, Abbas Jamalipour
Summary: This paper proposes a fuzzy-based participation and routing protocol for multi-hop device-to-device networking in intelligent transportation systems. The protocol uses fuzzy logic to determine nodes with the highest participation probability in routing, and thus creates more stable routes. Simulation results show that the proposed protocol improves network lifetime, decreases delay, and increases packet delivery ratio compared to existing routing protocols.
Article
Computer Science, Information Systems
Azadeh Arnaz, Justin Lipman, Mehran Abolhasan, Matti Hiltunen
Summary: Open RAN is an emerging advancement of the Radio Access Network (RAN) that aims to implement a vendor and network-generation agnostic RAN and incorporate artificial intelligence solutions. This paper introduces the architecture and components of Open RAN, explores AI use cases, and discusses AI deployment scenarios not covered by existing specifications.
Article
Computer Science, Information Systems
Imran Makhdoom, Justin Lipman, Mehran Abolhasan, Duncan Challen
Summary: This paper conducts an in-depth study of the characteristics of smart cities and science and technology parks, proposes the unique feature of Autonomous Systems as a Service, evaluates security and privacy challenges, and highlights the role of universities in the success of science and technology parks.
