Article
Chemistry, Multidisciplinary
Jinhai Sun, Yong-Qiang Liu, Jining Li, Xutao Zhang, He Cai, Xianli Zhu, Hongcheng Yin
Summary: A terahertz flexible metamaterial quarter-wave plate (QWP) is designed and fabricated using polyimide as the substrate, which exhibits a 3 dB axial ratio bandwidth of 0.51 THz, high polarization conversion efficiency, and transmittance. The effects of incidence angle on the polarization conversion performance and the blocking effect of the QWP combined with a polarizer on the backward reflection of terahertz waves are studied. The flexible terahertz metamaterial QWPs and polarizers have the potential to effectively block harmful reflected waves in terahertz communication and other systems, and they offer advantages such as a simple structure, ultra-thinness and flexibility, easy integration, and no external magnetic field or low-temperature requirements.
Article
Optics
Zhuo Zhang, Yandong Gong, Kai Pang
Summary: This work realizes a broadband terahertz achromatic quarter wave plate by stacking multiple metasurface layers, enabling arbitrary polarization control and ideal applicability in other frequency bands.
Article
Chemistry, Multidisciplinary
James Davis, Durdu Guney
Summary: Metamaterial-based quarter-wave plates (QWPs) offer great potential in optical applications due to their ultra-thin profiles and tailored spectral responses. In this study, an ultra-thin, high-efficiency, and broadband QWP based on a TiO2/Au grating structure is designed. The challenges posed by multiple reflections and near-field effects in integrating these devices are discussed, along with insights for improved design methodology and optimization of integrated metamaterial QWPs and other metadevices.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Yanli Chen, Jiaqi Li, Changpei He, Jinsong Qin, Xianhua Chen, Shilin Li
Summary: This paper presents a dual-band THz metamaterial filter based on VO2, which shows temperature sensitivity and can modulate transmission peaks and resonance frequencies by heating or cooling, transforming two transmission peaks into a broad transmission band with temperature increasing.
Article
Optics
Shi-Tong Xu, Fei Fan, Yun-Yun Ji, Sheng-Jiang Chang
Summary: In this study, a carbon nanotube integrated metamaterial for orthogonal polarization control in the THz regime was fabricated and investigated. The mechanism of multilayer polarization selection and multiple reflections in CNT constructed micro-cavity achieved perfect orthogonal polarization conversion. The combination of nanomaterials with optical microstructures brings new ideas for designing novel THz devices.
Article
Optics
Shengnan Guan, Jierong Cheng, Yiwu Yuan, Xipu Dong, Fei Fan, Xianghui Wang, Shengjiang Chang
Summary: A dielectric grating structure is proposed as a wideband quarter-wave plate at terahertz frequencies, offering alleviated structure complexity and wide bandwidth. The superposition of waveguide modes is used to achieve wideband linear-to-circular polarization conversion.
OPTICAL ENGINEERING
(2022)
Article
Optics
Dongming Liu, Tingting Lv, Guohua Dong, Chao Liu, Qiang Liu, Zheng Zhu, Yuxiang Li, Chunying Guan, Jinhui Shi
Summary: This study introduces a single-layer terahertz anisotropic metasurface quarter-wave plate for broadband linear to pure circular polarization conversion, with robust performance across various incident angles. Angle-tunable arbitrary polarization states can be achieved by changing the angle of incidence at other frequencies, promoting the development of broadband polarization conversion components.
OPTICS COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Lilit Gevorgyan, Hovhannes Haroyan, Henrik Parsamyan, Khachatur Nerkararyan
Summary: We propose a simple design of an ultra-broadband metamaterial absorber (MMA) for terahertz (THz) radiation based on vanadium dioxide (VO2) configurations. The MMA consists of orderly distributed VO2 strips, a dielectric spacer, and an Au reflector. The absorption properties of an individual VO2 strip are characterized using theoretical analysis, and the results are used to design the MMA. It is shown that the MMA exhibits efficient absorption in a broad spectrum of 0.66-1.84 THz, with an absorption band relative to the center frequency reaching as high as 94.4%. Wide polarization and incidence angle tolerance are achieved by adding an identical parallel layer rotated by 90 degrees. The absorption mechanism of the structure is elucidated using interference theory, and the possibility of modulating the electromagnetic response of the MMA is demonstrated based on the tunable THz optical properties of VO2.
Article
Optics
Kwang-Jin Ri, Chung-Ho Ri, Song-Yun Ri
Summary: In this study, a highly efficient ultra-broadband terahertz metamaterial absorber (MA) is proposed by using a simple design method. The absorption performance of the absorber is significantly improved compared to previous absorbers. It exhibits co-polarization ultra-broadband absorption with absorptivity above 90% in the range of 2.65-6.76 THz, and maintains high absorptivity above 80% for incident angles up to 40 degrees under both TE and TM polarizations.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Zhengli Han, Yuma Takida, Seigo Ohno, Hiroaki Minamide
Summary: This article presents a metamaterial-based thin-film lens that can focus light at the terahertz frequency with high transmittance, short focal length, and subwavelength thickness. By alternating concentric metamaterial-patterned and un-patterned zones, the lens achieves a diffraction-limited resolution of 0.6 mm for imaging applications.
Article
Physics, Applied
Yongjun Yu, Pingyuan Sun, Yunfan Wang, Zhaoyang Chen
Summary: The proposed ultra-wideband microwave metamaterial absorber features a sandwich structure with a top metal pattern arranged periodically on a copper background. Combining Fe-Co composites and metamaterials, it effectively solves the narrow-band problem of microwave absorption, achieving over 90% absorptivity in the 2.16-18 GHz frequency band for normal incidence. The absorber's performance is not sensitive to the polarization of incident waves.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yao Wen, Kunlin Chen, Yu-Sheng Lin
Summary: The study introduces two tunable terahertz metamaterial resonators, TTM-1 and TTM-2, which can modulate resonant frequency by moving the metal frame, with tuning ranges of 0.19 THz and 0.79 THz respectively. The devices also demonstrate anti-inference capability by transversely moving the metal frame.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Mechanical
Xinlei Fan, Jinqiang Li, Xueyi Zhang, Fengming Li
Summary: In this paper, a metamaterial plate with low and wide frequency bandgaps is designed using complex resonators. The transmission and vibration characteristics of the plate are studied through finite element simulation and experiment, showing that the bandgaps can be adjusted by changing the structure of the complex resonators.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Wei Cui, Yixuan Wang, Jingjing Xue, Zhihui He, Hui He
Summary: The Fano resonance in a simple graphene metamaterial was investigated using the finite-difference time-domain (FDTD) method. The results show that the transmission spectra of the Fano resonance can be tuned by the Fermi level and carrier mobility, with the proposed graphene metamaterial showing potential for sensing applications in the terahertz band with a high Figure of Merit (FoM) reaching up to 106.92. This proposal may lead the way for designing graphene-based terahertz sensing applications.
RESULTS IN PHYSICS
(2021)
Article
Physics, Applied
Shengnan Li, Liuyang Zhang, Xuefeng Chen
Summary: The study combines 3D printing technology with magnetron sputtering to realize additive manufacturing of terahertz metamaterials. Experimental results show that the 3D printed absorber has a near-unity narrow-band absorption peak at 0.8THz, demonstrating potential for bio-sensing applications.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Yuma Takida, Kouji Nawata, Hiroaki Minamide
Summary: This study introduces a gas detection platform based on THz-wave spectroscopy, which can detect and identify trace gases. By using multipass gas absorption cells of different path lengths, gas components can be sensitively detected and applied to security screening applications.
Article
Optics
Yuma Takida, Kouji Nawata, Takashi Notake, Taiichi Otsuji, Hiroaki Minamide
Summary: A nonlinear optical mixing technique is used to detect and characterize sub-nanosecond terahertz (THz)-wave pulses. The frequency up-conversion and parametric amplification methods are employed for sensitive detection and intensity cross-correlation characterization. The experimental results reveal the temporal profile of THz-wave pulses generated by the injection-seeded THz-wave parametric generator (is-TPG) in the tunable range of 0.95-2.00 THz to have a pulse width of 150-190 ps at full width at half-maximum.
Article
Optics
Zhengli Han, Yuma Takida, Seigo Ohno, Hiroaki Minamide
Summary: This article presents a metamaterial-based thin-film lens that can focus light at the terahertz frequency with high transmittance, short focal length, and subwavelength thickness. By alternating concentric metamaterial-patterned and un-patterned zones, the lens achieves a diffraction-limited resolution of 0.6 mm for imaging applications.
Article
Physics, Applied
Yu Tokizane, Seigo Ohno, Yuma Takida, Jun-ichi Shikata, Hiroaki Minamide
Summary: This study investigates multiple resonances in extraordinary transmission through a bull's-eye structure in the terahertz frequency region. The resonances are observed with both normal and oblique incident waves, revealing the potential coupling mechanisms for designing THz biosensing devices and THz antennas.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Zhengli Han, Christian Frydendahl, Noa Mazurski, Uriel Levy
Summary: This article introduces a cost-effective and fast full-range electrically controlled RGB color display. It utilizes plasmonic metasurfaces and MEMS technology with common materials such as aluminum and silicon oxide, allowing for color filter modulation and transmission control. The display demonstrates high-speed response and adjustable transparency, which is significant for future ultrafast displays.
Article
Materials Science, Multidisciplinary
Daichi Suzuki, Yuma Takida, Yukio Kawano, Hiroaki Minamide, Nao Terasaki
Summary: This study reports the thermal and optical characteristics of CNT films and presents an optimal device structure and improved sensor performance. By serially connecting multiple elements and designing with the optimal structure, the detection sensitivity was significantly enhanced. Furthermore, the potential of CNT films for THz spectroscopy applications was demonstrated.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2022)
Article
Optics
Yuye Wang, Changhao Hu, Chao Yan, Kai Chen, Yuma Takida, Hiroaki Minamide, Degang Xu, Jianquan Yao
Summary: This study demonstrates a highly sensitive multi-stage terahertz wave detector based on parametric upconversion. By utilizing a KTiOPO4 crystal, the terahertz wave is converted into near-infrared light, and detection sensitivity is improved through signal amplification using phase matching techniques. The detector exhibits rapid response in the frequency ranges of 4.26-4.50 THz and 4.80-4.92 THz, and simultaneous detection of dual-color terahertz waves is achieved.
Article
Nanoscience & Nanotechnology
Nir Levanon, S. R. K. Chaitanya Indukuri, Christian Frydendahl, Jonathan Bar-David, Zhengli Han, Noa Mazurski, Uriel Levy
Summary: High-index dielectric metasurfaces have great potential in nanophotonics due to their controllable optical properties and small size. This article focuses on the numerical and experimental study of symmetry-breaking metasurfaces made of amorphous silicon nanodisks. The results show that the angular response of the metasurfaces varies with the tilt direction of the incident light.
Article
Optics
Kobi Ben-Atar, Zhengli Han, Christian Frydendahl, Noa Mazurski, Zhanghua Han, Uriel Levy
Summary: Achieving high-Q resonances in the THz frequency range is important for various applications. This letter investigates a complementary metal-lic disk-hole array (CMA) that combines lattice resonances with Fabry-Perot cavity resonances to achieve record-breaking Q-factors of up to 750 at THz frequencies. This is the highest quality factor measured for a metallic metamaterial structure at THz frequencies to date. (c) 2023 Optica Publishing Group.
Article
Optics
Koichi Tamura, Chao Tang, Daichi Ogiura, Kento Suwa, Hirokazu Fukidome, Yuma Takida, Hiroaki Minamide, Tetsuya Suemitsu, Taiichi Otsuji, Akira Satou
Summary: In this study, a new epitaxial graphene field-effect transistor with an asymmetric dual-grating-gate (ADGG) structure was designed and fabricated to achieve fast and sensitive detection of terahertz radiation. The experimental results demonstrated its promising performance in high-speed wireless communication systems.
Proceedings Paper
Engineering, Electrical & Electronic
Changhao Hu, Yuye Wang, Kai Chen, Chao Yan, Degang Xu, Yuma Takida, Hiroaki Minamide, Jianquan Yao
Summary: This paper demonstrates a highly sensitive terahertz parametric up-conversion detector based on a KTiOPO4 crystal, which enables terahertz wave detection in a high-frequency range.
INFRARED, MILLIMETER-WAVE, AND TERAHERTZ TECHNOLOGIES IX
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Yuma Takida, Kouji Nawata, Takashi Notake, Hiroaki Minamide
Summary: We have demonstrated injection-seeded backward terahertz-wave parametric oscillators based on a periodically poled lithium niobate crystal. By optical injection seeding for the forward-propagating idler wavelength, we achieved a significant enhancement in backward-propagating THz-wave output energy and long-term stable operation. Furthermore, the oscillation frequency of backward-propagating THz waves can be continuously tuned by angle tuning of the crystal.
TERAHERTZ PHOTONICS II
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Zhengli Han, Christian Frydendahl, Noa Mazurski, Uriel Levy
Summary: This technology enables dynamic control of plasmonic colors by using MEMS cantilevers to switch the colors provided by nano hole structures.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Article
Materials Science, Multidisciplinary
Zhengli Han, Seigo Ohno, Hiroaki Minamide
Summary: Metamaterial resonances have shown remarkable abilities in controlling electromagnetic waves, allowing for the creation of a unique channel for electromagnetic wave tunneling through barriers. This study demonstrates an electromagnetic wave tunneling effect using an antiparallel dipole resonance in a multilayer metamaterial, with assistance from a magnetic response creating a bypass bridge, enabling the wave to pass through barriers.
ADVANCED PHOTONICS RESEARCH
(2021)
