Article
Materials Science, Multidisciplinary
Muhammad Hafidzurrahman, Hadi Teguh Yudistira, Teuku Meurah Indra Riayatsyah, Adhitya Gandaryus Saputro
Summary: Multilayer metamaterials have been used to tailor material properties, but the alignment of each layer remains a critical challenge. This study focuses on the performance of negative refractive index using a touching circular unit cell of single-layer metamaterials, with varying dielectric thickness. Simulation and experimental results reveal that negative refractive index values occur for each dielectric thickness variation in single-layer metamaterials. The peaks of negative refractive index values shift with the varied dielectric thickness, and although there are disparities between simulation and experimental results due to imperfect fabrication samples, the trend in the simulation result is similar to the experimental result.
Article
Physics, Multidisciplinary
Hailin Ren, Shijun Ji, Ji Zhao, Handa Dai
Summary: A plasmon-induced terahertz metamaterial absorber is introduced, using a gold bottom layer to block the transmission of terahertz waves, with a topas layer separating the pattern layer and ground layer. The absorber exhibits a 90% absorption bandwidth frequency range of 4.6-7.7 THz, with an average absorption rate of 97.6% in this range. It has polarization insensitivity due to its geometric symmetry, and can maintain over 80% absorption even at an incidence angle of 60 degrees. The absorber also shows good linear frequency shift with refractive index change, with a sensitivity of 1100 GHz per refractive index unit (GHz/RIU), making it suitable for complex electromagnetic scenarios or as a sensing element.
Article
Engineering, Electrical & Electronic
Haizi Yao, Hongying Mei, Weiwei Zhang, Shuncong Zhong, Xiangfeng Wang
Summary: This study proposes a terahertz metamaterial refractive index/thickness sensor with low-frequency Fano resonance and high-frequency electromagnetically induced transparent (EIT) resonance. The simulated and experimental results demonstrate that the sensor has high sensitivity in refractive index and thickness sensing, making it suitable for biological and chemical sensing applications.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Weijian Cai, Jianfang Zhu, Youpeng Yang, Xiaoran Wang, Zhengfang Qian, Shuting Fan
Summary: In this study, a double-open hexagonal ring metamaterial (MM) with high refractive index sensitivity was designed and fabricated to improve the detection sensitivity of terahertz (THz) biosensors. The resonant properties of the MMs were demonstrated through simulations and experiments. The MM sensor showed high sensitivity and low detection limits to glucose and bovine serum protein (BSA) solutions, indicating potential applications in the THz biomedical field.
IEEE SENSORS JOURNAL
(2023)
Article
Instruments & Instrumentation
Ruonan Zeng, Yujing Bian, Xun Zhang, Zhenqi Zhu, Bin Yang
Summary: The THz band provides valuable information about vibration and rotational energy levels of amino acid molecules. By using THz time-domain spectroscopy, different kinds of amino acids and isomers can be effectively identified. The absorption spectra of threonine isomers were investigated and the results showed similarities in the infrared band but noticeable differences in the THz band. Simulation calculations combined with density functional theory were conducted to understand the origin of the THz absorption characteristics of isomer molecules. The refractive index and dielectric loss spectrum of threonine isomers in the THz band revealed the response characteristics of dipole orientation polarization.
APPLIED SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Meng Liu, Eric Plum, Hua Li, Shaoxian Li, Quan Xu, Xueqian Zhang, Caihong Zhang, Chongwen Zou, Biaobing Jin, Jiaguang Han, Weili Zhang
Summary: Chiral media exhibit optical activity by differential retardation and attenuation of circularly polarized electromagnetic waves. Control of chirality, optical activity, and refractive index is demonstrated using a terahertz metamaterial based on 3D-chiral metallic resonators and achiral vanadium dioxide inclusions. The chiral structure shows pronounced optical activity and a negative refractive index at room temperature, while becoming achiral and having a positive refractive index upon heating. The chiral response originates from magnetic coupling and transitions to electric dipole excitations. Rotationally symmetric design allows the structure to function as a tunable polarization rotator, adjustable linear polarization converter, and switchable circular polarizer.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Ayesha Mohanty, Om Prakash Acharya, Bhargav Appasani, S. K. Mohapatra, Mohammad S. Khan
Summary: This paper presents and evaluates a new terahertz metamaterial absorber (MMA) for sensing applications, which offers high sensitivity and good detection performance for changes in refractive index of the environment.
IEEE SENSORS JOURNAL
(2021)
Article
Optics
Yong Gang Zhang, R. U. Zhang, Lan Ju Liang, Hai Yun Yao, Xin Yan, Cheng Cheng Huang, Ke Hao Ying
Summary: A multifunctional terahertz absorber based on Dirac semimetal and vanadium dioxide (VO2) is proposed in this paper. By modulating the temperature of VO2, the absorber can switch between narrow and wide band absorption. It has broadband absorption effect with a bandwidth of approximately 4 THz when VO2 is in the metallic state. In the insulating state, the absorber has two absorption peaks with high absorptivity, making it suitable for sensitive cell detection.
Article
Optics
Long Cheng, Fabio Formisano, Kirill A. Grishunin, Sergey D. Gorelov, Paul H. M. van Loosdrecht, Jian Yan, Xuan Luo, Zhigao Sheng, Evgeny A. Mashkovich
Summary: This study demonstrates the efficient induction of the quadratic electro-optic effect (Kerr effect) by a terahertz (THz) electric field in the quasi-two-dimensional material MnPS3. The findings suggest that MnPS3 has the potential to be a promising candidate for practical applications in future ultrafast electro-optical devices.
Article
Chemistry, Multidisciplinary
Zhao Chen, Yaolun Yu, Yilin Wang, Zhiling Hou, Li Yu
Summary: This study proposes a novel nanophotonics system that utilizes the interaction between high refractive index dielectric and two-dimensional metallic photonic crystal to achieve plasmon-induced transparency (PIT). The transmission and reflection characteristics of the system are demonstrated through simulations. The results show the successful implementation of stable 3D atom trapping, indicating significant potential for practical applications.
Article
Crystallography
Ibuki Takegami, Tsutomu Nagayama, Seiji Fukushima, Toshio Watanabe
Summary: This paper introduces a design theory for electromagnetic metamaterials with negative refractive indices using a distributed transmission-line model, and applies it to the design of acoustic metamaterials. The design formulas and calculations with small adjustments are used to rigorously design the unit cell structures of metamaterials with negative refractive indices and background media with positive refractive indices. The validity of the design theory is demonstrated through calculations, eigenvalue analysis, and full-wave simulations.
Article
Engineering, Multidisciplinary
Bhargav Appasani, Avireni Srinivasulu, Cristian Ravariu
Summary: A nearly perfect metamaterial absorber is proposed for terahertz sensing applications, consisting of two concentric elliptical ring resonators. The design achieves dual band absorption with near perfect absorption through appropriately set parameters. The absorption peaks are caused by currents in the resonators and the sensitivity to the refractive index of the surrounding medium is observed. A sensor based on this design is demonstrated for detecting Methane and Chloroform with high Q-factor and sensitivity.
DEFENCE TECHNOLOGY
(2023)
Article
Optics
Zhuo Wang, Yao Liang, Jiaqi Qu, Mu Ku Chen, Mingjie Cui, Zhi Cheng, Jingcheng Zhang, Jin Yao, Shufan Chen, Din Ping Tsai, Changyuan Yu
Summary: This study demonstrates the precise control of light-matter interaction through plasmonic resonances empowered by bound states in the continuum (BICs). By exploiting BICs in the parameter space, sharp resonances with ultra-weak angular dispersion effect and polarization-independent performance are achieved on symmetric plasmonic metasurfaces. These results provide a way to achieve efficient near-field enhancement using focused light produced by high numerical aperture objectives.
PHOTONICS RESEARCH
(2023)
Article
Optics
Zhiyong Wang, Yanghong Ou, Shiyu Wang, Yanzi Meng, Zi Wang, Xiang Zhai, Lingling Wang, Shengxuan Xia
Summary: In this paper, an easy-to-implement metamaterial absorber based on bulk Dirac semimetal is presented. The device achieves ultrahigh quality factor and excellent sensing performance, with precise control over resonance wavelength by adjusting the parameters. It has high-performance applications in terahertz filtering, detection, and biochemical sensing.
Article
Engineering, Electrical & Electronic
Guangsheng Deng, Linying Fang, Haisheng Mo, Jun Yang, Ying Li, Zhiping Yin
Summary: This article proposes a new metamaterial absorber for liquid sensing, which demonstrates good sensitivity. The sensor structure consists of dual quartz substrates, and the enhanced spectral shift per refractive index unit is achieved by incorporating dual semitoroidal resonators. Experimental results validate the potential application of this sensor in detecting solutions with different concentrations and commonly used oils.
IEEE SENSORS JOURNAL
(2022)
Article
Physics, Applied
Keisuke Takano, Yoku Tanaka, Gabriel Moreno, Abdallah Chahadih, Abbas Ghaddar, Xiang-Lei Han, Francois Vaurette, Yosuke Nakata, Fumiaki Miyamaru, Makoto Nakajima, Masanori Hangyo, Tahsin Akalin
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Physics, Applied
Melvin John F. Empizo, Kohei Yamanoi, Kazuyuki Mori, Keisuke Iwano, Yuki Iwasa, Yuki Minami, Ren Arita, Kazuhito Fukuda, Keisuke Takano, Toshihiko Shimizu, Makoto Nakajima, Masashi Yoshimura, Nobuhiko Sarukura, Takayoshi Norimatsu, Masanori Hangyo, Hiroshi Azechi, Tsuguo Fukuda, Bess G. Singidas, Roland V. Sarmago, Makoto Oya, Yoshio Ueda
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Engineering, Electrical & Electronic
Takaya Higashira, Tomoaki Kageyama, Kouhei Kashiwagi, Hidetoshi Miyashita, Keisuke Takano, Makoto Nakajima, Sang-Seok Lee
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
(2017)
Article
Nanoscience & Nanotechnology
Yasunori Tokuda, Koichiro Sakaguchi, Yuki Yamaguchi, Keisuke Takano
Article
Physics, Applied
Keisuke Takano, Hirofumi Harada, Masashi Yoshimura, Makoto Nakajima
APPLIED PHYSICS LETTERS
(2018)
Article
Materials Science, Multidisciplinary
Hiroki Miyaji, Adam Pander, Keisuke Takano, Hideo Kohno, Akimitsu Hatta, Makoto Nakajima, Hiroshi Furuta
DIAMOND AND RELATED MATERIALS
(2018)
Article
Physics, Applied
Yasunori Tokuda, Keisuke Takano, Koichiro Sakaguchi, Kosaku Kato, Makoto Nakajima, Koichi Akiyama
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Optics
Hongsong Qiu, Takayuki Kurihara, Hirofumi Harada, Kosaku Kato, Keisuke Takano, Tohru Suemoto, Masahiko Tani, Nobuhiko Sarukura, Masashi Yoshimura, Makoto Nakajima
Article
Multidisciplinary Sciences
Kotaro Makino, Kosaku Kato, Keisuke Takano, Yuta Saito, Junji Tominaga, Takashi Nakano, Goro Isoyama, Makoto Nakajima
SCIENTIFIC REPORTS
(2018)
Article
Nanoscience & Nanotechnology
Yasunori Tokuda, Keisuke Takano, Koichiro Sakaguchi, Kosaku Kato, Makoto Nakajima, Koichi Akiyama
Article
Nanoscience & Nanotechnology
K. Kan, M. Gohdo, J. Yang, I. Nozawa, Y. Yoshida, H. Kitahara, K. Takano, R. Kuroda, H. Toyokawa
Summary: The longitudinal electric field profile of coherent transition radiation was measured using a large-aperture photoconductive antenna, showing a reasonable response signal in the low-frequency region as low as 0.1 THz. Time-domain measurement of CTR was conducted by sweeping the timing of laser irradiation, limited by the response time of charge carriers in the semiconductor.
Article
Multidisciplinary Sciences
Keisuke Takano, Motoki Asai, Kosaku Kato, Hideaki Komiyama, Akihisa Yamaguchi, Tomokazu Iyoda, Yuzuru Tadokoro, Makoto Nakajima, Michael I. Bakunov
SCIENTIFIC REPORTS
(2019)
Article
Chemistry, Multidisciplinary
Lei Wang, Hongsong Qiu, Thanh Nhat Khoa Phan, Kosaku Kato, Boyoung Kang, Keisuke Takano, Yanqing Lu, Lujian Chen, Peng Lv, Kehan Yu, Wei Wei, Biaobing Jin, Makoto Nakajima
APPLIED SCIENCES-BASEL
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
Kotaro Makino, Kosaku Kato, Keisuke Takano, Yuta Saito, Junji Tominaga, Takashi Nakano, Goro Isoyama, Makoto Nakajima
2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
Yusuke Akamine, Dmitry Bulgarevich, Kohji Yamamoto, Takashi Furuya, Hideaki Kitahara, Jessica Afalla, Valynn Mag-Usara, Keisuke Takano, Makoto Nakajima, Khoa Nhat Thanh Phan, Kosaku Kato, Masahiko Tani
2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)
(2018)
