Article
Engineering, Electrical & Electronic
Michael S. Shur
Summary: The terahertz (THz) technology has wide applications, with Beyond 5G Wi-Fi and Internet of Things (IoT) as its expected killer applications. Plasmonic TeraFETs with feature sizes down to 3 nm could enable a dramatic expansion of these applications.
IEEE SENSORS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Xinxin Gao, Bao Jie Chen, Kam-Man Shum, Qian Ma, Wen Yi Cui, Tie Jun Cui, Chi Hou Chan
Summary: The next-generation wireless communications and intrachip and interchip communications require high-speed terahertz (THz) interconnects, which can be achieved using spoof surface plasmon polaritons (SSPPs). This study proposes and experimentally demonstrates planar multifunctional THz plasmonic devices based on the interaction between SSPPs and spoof localized surface plasmon (SLSPs). These devices enable pass-through transmission, multifrequency resonances, and phase shift in THz plasmonic systems, making them promising for on-chip integrations, wireless communications, and sensing systems.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Optics
Ayato Iba, Calvin W. Domier, Makoto Ikeda, Atsushi Mase, Makoto Nakajima, Anh-Vu Pham, Neville C. Luhmann
Summary: The super-oscillatory lens described in the letter has been experimentally and theoretically investigated, demonstrating high spatial resolution and depth of focus, making it suitable for industrial inspections.
Article
Engineering, Electrical & Electronic
Wei Kou, Wenqiao Shi, Yaxin Zhang, Ziqiang Yang, Ting Chen, Jianqiang Gu, Xilin Zhang, Qiwu Shi, Shixiong Liang, Feng Lan, Hongxin Zeng
Summary: This study presents a tunable focusing planar lens based on a phase gradient vanadium dioxide composite metasurface controlled by an external thermal stimulus. The composite metasurface can show a different phase gradient distribution through the insulator-metal phase transition characteristics of the vanadium dioxide components, enabling switchable focusing.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2022)
Article
Optics
Jose Sasian
Summary: A simple and accurate method for determining the focal length of a lens is proposed in this paper. The method does not require knowing the distance between lens principal planes and can be conducted with readily available and inexpensive hardware. Depending on the f-number of the test lens (TL), the error in determining the focal length can be as small as 0.1% of the focal length. The paper discusses several equations, including the Newton equation, Bessel equation, and other equations, for determining the focal length.
OPTICAL ENGINEERING
(2023)
Article
Optics
Liyong Jiang, Jianli Jiang, Zebin Zhu, Guanghui Yuan, Ming Kang, Ze Xiang Shen
Summary: Understanding the origin of modes in planar metamaterials is crucial for applications in nanophotonics and plasmonics. The proposed mode evolution method with plasmonic evolution maps can provide a simple, efficient, and universal approach for mode analysis in different types of planar metamaterials, revealing the role of structure symmetry in the mode formation process.
PHOTONICS RESEARCH
(2021)
Article
Physics, Multidisciplinary
P. Sai, V. V. Korotyeyev, M. Dub, M. Slowikowski, M. Filipiak, D. B. But, Yu. Ivonyak, M. Sakowicz, Yu. M. Lyaschuk, S. M. Kukhtaruk, G. Cywinski, W. Knap
Summary: In this study, we investigated resonant two-dimensional plasmon excitations in grating-gated quantum well heterostructures, which allows for electrical control of charge carrier density. Our results show that all terahertz plasmonic resonances in these structures can be explained within the plasmonic crystal model, and we identified two different plasmonic crystal phases. By gate controlling the modulation degree, we observed a continuous transition between these phases. We also discovered that the resonant plasma frequencies of ungated regions still depend on the gate voltage. These findings have implications for understanding THz plasma physics and developing all-electrically tunable devices for THz optoelectronics.
Article
Optics
Xinyu Ma, Yanfeng Li, Jiaguang Han
Summary: An ultracompact terahertz mode division multiplexer based on THz spoof SPPs is proposed. The mode multiplexer can be designed with a reduced footprint by exploiting more degrees of freedom in the parameters of the unit cell. It can simultaneously support the propagation of four mode channels: TM0, TM1, TM2, and TM3 modes.
Article
Optics
Chenglong Wang, Xiang Guo, Xidong Wu
Summary: This paper proposes and investigates a graphene plasmonic lens with an electrically tunable focal length. By controlling the gate voltage of graphene, the lens can be continuously tuned from a Maxwell Fisheye lens to a Luneburg lens, and excellent focusing performances are achieved.
Article
Optics
L. I. Wei - Fan, Q. Feng, W. A. N. G. Ye - Long, L. I. U. Peng - Xiang
Summary: The focal shift effect of terahertz beam focusing with wide-aperture refractive lens was investigated. Reference values of relative focal shifts and combinations of different lens parameters were analyzed and discussed. Two approaches, using commercial lens and customized lens design, were proposed to ensure the working efficiency and performance of a THz system.
JOURNAL OF INFRARED AND MILLIMETER WAVES
(2023)
Review
Nanoscience & Nanotechnology
Taiichi Otsuji, Stephane Albon Boubanga-Tombet, Akira Satou, Deepika Yadav, Hirokazu Fukidome, Takayuki Watanabe, Tetsuya Suemitsu, Alexander A. Dubinov, Vyacheslav V. Popov, Wojciech Knap, Valentin Kachorovskii, Koichi Narahara, Maxim Ryzhii, Vladimir Mitin, Michael S. Shur, Victor Ryzhii
Summary: This paper reviews recent advancements in graphene-based plasmonic metamaterials for terahertz (THz) laser transistors. The researchers investigate various approaches using graphene plasmonic metamaterials to achieve room-temperature, dry-cell-battery operated intense THz lasing with fast direct modulation. The paper discusses device structures and design constraints for coherent light sources applicable to future THz wireless communication systems.
Article
Engineering, Multidisciplinary
Yueqiang Hu, Ling Li, Rong Wang, Jian Song, Hongdong Wang, Huigao Duan, Jiaxin Ji, Yonggang Meng
Summary: A parallel plasmonic direct-writing nanolithography system has been established to achieve a minimum flying height of around 15 nm with high parallelism at a rotating speed of 8-18 m/s. Additionally, a multi-stage metasurface-based polarization insensitive plasmonic lens is proposed to couple more power and realize more confined spot compared to conventional plasmonic lenses. The prototyping system enables parallel lithography of nanostructures with the smallest linewidth around 26 nm.
Article
Optics
Zhibin Jiang, Yilun Wang, Liao Chen, Yu Yu, Shixing Yuan, Wentao Deng, Ruolan Wang, Ziwei Wang, Qizhi Yan, Xiaojun Wu, Xinliang Zhang
Summary: The technique of photo-mixing, along with the development of graphene photodetectors, has led to the emergence of integrated THz emitters. The SPG sub-THz emitter is capable of emitting sub-THz waves in the frequency range of 50 to 300 GHz, offering significant potential for various THz applications.
Article
Nanoscience & Nanotechnology
Wendao Xu, Wenzhang Fang, Teng Shi, Xin Ming, Yingli Wang, Lijuan Xie, Li Peng, Hou-Tong Chen, Yibin Ying
Summary: Researchers have developed an alternative approach to achieve tunable terahertz photonic devices by postprocessing nanothickness graphene films. These films have widely tunable conductivity and enable versatile THz applications, such as high-performance electronics, photonics, and sensors. The researchers successfully detected diphenylamine using this method, demonstrating its potential in molecular sensing.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Georgii Shamuilov, Katerina Domina, Vyacheslav Khardikov, Alexey Y. Nikitin, Vitaliy Goryashko
Summary: The article introduces a new type of tunable Optical Magnetic Lens (OML) which focuses photon beams using a subwavelength-thin layer of magneto-optical material in a non-uniform magnetic field. The OML concept has been applied to a wide range of materials and has shown to have effects in a broad frequency range.
