Article
Physics, Multidisciplinary
Zhi Ren, Wanqing Wang, Yinghui Zhao, Siqi Chang, Guanhua Ren, Songtao Li, Ruoxing Wang
Summary: Based on the phase change properties of vanadium dioxide (VO2), we propose a terahertz metamaterial absorber that can be switched flexibly between ultra-broadband and dual bands. The absorber achieves switching by changing the conductivity of VO2 through thermal control. Simulation results show that the absorber realizes high absorption bandwidth in the ultra-broadband mode and dual-band absorption at specific frequencies in the dual-band mode. This design significantly improves absorption performance compared to previous studies and has potential applications in terahertz devices.
FRONTIERS IN PHYSICS
(2023)
Article
Optics
Tingting Lv, Guohua Dong, Chunhua Qin, Jia Qu, Bo Lv, Wenjia Li, Zheng Zhu, Yuxiang Li, Chunying Guan, Jinhui Shi
Summary: The article presents a thermally switchable terahertz metamaterial absorber based on VO2 phase transition, capable of switching absorption effects in different frequency bands, with polarization-dependency and absorption switching effects under metallic VO2 state at different polarization angles.
Article
Optics
Yan Liu, Rui Huang, Zhengbiao Ouyang
Summary: An absorber based on hybrid metamaterial with vanadium dioxide and graphene achieves dynamically switchable dual-broadband absorption in the terahertz regime by controlling the phase transition of vanadium dioxide and the Fermi energy level of graphene. The absorber can achieve high absorptance in high-frequency broadband and low-frequency broadband, with the absorption intensity being continuously adjustable by electrically controlling the Fermi energy level of graphene. The absorption window can be further broadened by adjusting geometrical parameters, making the absorber suitable for applications such as filtering, sensing, cloaking objects, and switches in the terahertz regime.
Article
Materials Science, Multidisciplinary
Guozheng Wu, Chao Li, Dong Wang, Wenya Chen, Song Gao, Haijun Guo, Chunwei Zhang, Shijing Guo
Summary: In this paper, a terahertz absorber with switchable absorption modes is introduced using patterned graphene-vanadium dioxide. By thermally tuning vanadium dioxide and electrically controlling graphene, the device can switch between two distinct absorption modes. The device achieves an ultra-broadband absorption with a bandwidth of 4.62 THz when the conductivity of vanadium dioxide is 200,000 S/m and a narrower bandwidth of 0.95 THz when the conductivity is 200 S/m. Controlling the Fermi energy of graphene allows for control over the amplitude and frequency shift of the broadband mode. The device also exhibits remarkable symmetry and robust absorption characteristics. Potential applications include broadband mirrors and electromagnetic shielding.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Optics
Zhen Peng, Zesong Zheng, Zhisheng Yu, Huiting Lan, Min Zhang, Shixing Wang, Ling Li, Huawei Liang, Hong Su
Summary: By introducing vanadium dioxide with the metal to insulate phase transition, a broadband absorption and polarization conversion switchable terahertz metamaterial device can be achieved. In the metallic state of vanadium dioxide, the device exhibits broadband absorption with over 90% absorption from 1.03 THz to 2.62 THz, which is insensitive to incident angle and polarization. In the insulate state of vanadium dioxide, the device functions as a polarization converter, converting linear to cross polarization and linear to circular polarization. The proposed bifunctional device shows great potential in tunable and diverse functionalities for THz devices.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Biao Wu, Xiaoshan Liu, Guolan Fu, Guiqiang Liu, Zhengqi Liu, Jing Chen
Summary: A novel and simple design of switchable broadband terahertz metamaterial absorber is proposed and demonstrated, combining graphene as electrically adjusting material and vanadium dioxide (VO2) as temperature-related phase-change material in a multi-channel manipulation design. The absorber can achieve broadband absorption with adjustable rates in different frequency ranges by manipulating the states of VO2 and the Fermi energy level of graphene. The design has potential applications in terahertz wave technologies, such as intelligent switching and tunable filtering.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Lingyun Zhuang, Wenjing Zhang, Jietao Liu, Minghao Chao, Qingsong Liu, Bo Cheng, Yun Xu, Guofeng Song
Summary: A multilayer terahertz absorber composed of hybrid graphene and vanadium dioxide (VO2) is proposed in this paper. Three different switchable absorption states are achieved in one structure by controlling graphene and tuning VO2. The absorber has potential applications in modulation, filtering, detection, and other fields.
Article
Chemistry, Multidisciplinary
Guan Wang, Tong Wu, Yang Jia, Yang Gao, Yachen Gao
Summary: This paper presents a multifunctional switchable terahertz (THz) absorber based on graphene and vanadium dioxide (VO2), which can switch between single or double broadband absorption by adjusting the temperature of VO2. The absorptivity's amplitude can be adjusted by changing the Fermi energy level of graphene or the conductivity of VO2 separately. The physical mechanism of the absorber and the effects of incidence angle on absorption have been studied, indicating that the absorber is insensitive to the polarization of electromagnetic waves.
Article
Optics
Baoqing Wang, Cuiping Ma, Peng Yu, Alexander O. Govorov, Hongxing Xu, Wenhao Wang, Lucas V. Besteiro, Zhimin Jing, Peihang LI, Zhiming Wang
Summary: In this work, an ultra-broadband nanowire metamaterial absorber composed of vertically aligned dielectric nanowires with coaxial metallic rings is proposed. The absorber exhibits strong absorption from 0.2 to 7 μm wavelength range, making it suitable for various applications.
PHOTONICS RESEARCH
(2022)
Article
Physics, Multidisciplinary
Zekai Zhou, Zhengyong Song
Summary: A terahertz switchable metamaterial is proposed with bifunctional properties based on a mixed structure of graphene and vanadium dioxide (VO2). It can be used for anomalous reflection and broadband absorption by adjusting the material's properties and structure effectively controlling terahertz waves.
Article
Optics
Lei Yang, Hao Wang, Xudong Ren, Xiaoxian Song, Mingyang Chen, Yanqun Tong, Yunxia Ye, Yunpeng Ren, Shenyi Liu, Sibo Wang, Liang Yin, Jianquan Yao
Summary: The terahertz absorber designed using metamaterial and employing photosensitive semiconductor material GaAs shows tunability in absorption peak with significant changes. Qualitative analyses on electromagnetic responding modes are conducted to understand the physical mechanisms, showing great potential in various applications.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Zhe Chen, Jinjiang Chen, Haowen Tang, Tao Shen, Hui Zhang
Summary: This paper proposes a terahertz absorber with a simple four-layered structure that can be dynamically switched between broadband and triple-band absorption by controlling the chemical potential of graphene. The absorber demonstrates high absorption efficiency, insensitivity to incident polarization, and shows potential in terahertz applications such as detectors, modulators, and sensors.
Article
Chemistry, Physical
Kavitha Muthukrishnan, Venkateswaran Narasimhan
Summary: Terahertz metamaterial absorbers (MMA) have shown promising research prospects in the development of multiband absorbers, with applications in THz imaging, wireless communication, and bolometric detectors. By utilizing a GaAs substrate and a metallic pattern on a gold layer, this design achieved 9-band absorption in the THz spectral region. The absorption mechanism was studied using electric field dispersion analysis and impedance matching, demonstrating nine bands within a narrow frequency range and potential applications in hyperspectral imaging and clinical sensing.
Article
Chemistry, Multidisciplinary
Hengli Feng, Zuoxin Zhang, Jingyu Zhang, Dongchao Fang, Jincheng Wang, Chang Liu, Tong Wu, Guan Wang, Lehui Wang, Lingling Ran, Yang Gao
Summary: This article proposed a dual broadband terahertz bifunction absorber that can be actively tuned to achieve perfect modulation of absorptance and absorption bandwidth. It also has the advantages of being polarization insensitive and maintaining stable absorption at wide angles of oblique incidence.
Article
Multidisciplinary Sciences
Nanli Mou, Bing Tang, Jingzhou Li, Hongxing Dong, Long Zhang
Summary: Researchers have developed a thermally switchable terahertz metasurface that can achieve high transmission and ultra-broadband absorption at different temperatures, making it insensitive to the incident angle. The structure is highly scalable and has potential applications in areas such as optical switching, terahertz imaging, and filtering.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Condensed Matter
Yuanyuan Jiang, Xiaoqin Zhu, Zhengyong Song
Summary: A new type of terahertz switchable metamaterial is proposed with dual functions, utilizing the properties of vanadium dioxide to switch between an absorber and an analog of electromagnetically induced transparency. The performance of bifunctionality is omnidirectional and efficient in two modes, enabling advanced applications in the fields of modulator and filter.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Yuanyuan Jiang, Man Zhang, Weihua Wang, Zhengyong Song
Summary: This research presents a metamaterial configuration utilizing the phase transition characteristic of vanadium dioxide to achieve reflective and transmissive cross-polarization converters. The design demonstrates efficient polarization conversion in different states and frequency ranges.
Article
Engineering, Electrical & Electronic
Feng Zhao, Jiashuai Xu, Zhengyong Song
Summary: This paper utilizes graphene-based Pancharatnam-Berry metasurfaces to achieve beam steering in the terahertz band, designing metasurfaces that can generate multiple beams in space.
IEEE PHOTONICS JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Jinjin Zhong, Zhengyong Song, Long Zhang, Xiang Li, Qingzu He, Yuer Lu, Sarah Kariko, Peter Shaw, Liyu Liu, Fangfu Ye, Ling Li, Jianwei Shuai
Summary: This study reports a polarization-insensitive broadband reflection in a spider based on the type and arrangement of guanine crystals, providing insights into similar reflections in biological optical systems. The findings highlight the importance of crystallographic characteristics and 3D arrangement in optimizing natural optical effects.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Optics
Canhui He, Zhengyong Song
Summary: Polarization state of terahertz wave is controlled by changing the Fermi energy level of graphene in this study. Four graphene-based meta-atoms are designed to emit cross-polarized wave with a phase difference of 90 degrees and nearly disappear the wave when adjusted to different Fermi energy levels. Additionally, three dynamic metasurfaces are developed using selected elements to control the wavefront of the reflected beam, combining wavefront control and polarization manipulation successfully.
Article
Engineering, Electrical & Electronic
Hongyuan Zhu, Zhengyong Song
Summary: Based on the phase change material germanium antimony telluride, reflective metasurfaces are constructed using the Pancharatnam-Berry phase, allowing for manipulation of the reflection mode of terahertz waves. Three examples including a gradient metasurface, vortex beam generator, and focusing lens were demonstrated to showcase the functionality of these metasurfaces.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Zekai Zhou, Zhengyong Song
Summary: Gradient metasurface provides a new way for controlling electromagnetic wave by adjusting the wavefront, and graphene-based metasurfaces can dynamically adjust the wavefront of circularly polarized waves in the terahertz band, which is beneficial for improving wireless communication performance.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Zhiqiang Du, Zhengyong Song
Summary: Due to the increasing complexity of modern communication systems, the requirements for electromagnetic wave are becoming more and more rigorous. Metasurfaces based on Ge3Sb2Te6 are designed to control electromagnetic wavefront in the mid-infrared range by changing the state of Ge3Sb2Te6. By designing specific structures, deflection of electromagnetic wavefront and vortex beams with orbital angular momentum can be achieved. This design may lead to novel types of metasurfaces.
Article
Physics, Multidisciplinary
Hongyuan Zhu, Canhui He, Runxuan Zhang, Zhengyong Song
Summary: Metalens is a compact and flexible lens composed of subwavelength metal or dielectric meta-atoms arranged according to phase distribution. This study presents spin-sensitive plasmonic metasurfaces with independent phase modulation capability for controlling circularly polarized waves. Different types of metasurfaces are designed and numerically displayed to confirm their effectiveness in focusing and splitting circularly polarized beams.
Article
Physics, Multidisciplinary
Chaoyan Sun, Canhui He, Ruixing Nie, Runxuan Zhang, Zhengyong Song
Summary: This paper presents Ge3Sb2Te6 meta-atoms to achieve polarization switching for mid-infrared waves. The proposed meta-atoms with 90 degrees phase shift achieve high-efficiency polarization conversion and 360 degrees phase coverage. With the transition to the amorphous state, phase coverage drops to only 36 degrees. Three metasurfaces are implemented at 76.5 THz, which can dynamically switch between specular reflection and anomalous reflection, realize switching between focusing and defocusing, and reconstruct the mode of orbital angular momentum (OAM).
Article
Physics, Multidisciplinary
Heyi Zhang, Runxuan Zhang, Canhui He, Changqing Li, Zhengyong Song
Summary: This study presents anisotropic plasmonic metasurfaces with linear polarization-dependent focusings. Phase modulation in different polarization channels is achieved by adjusting the dimensions of cross-shaped gold. Three metasurfaces are demonstrated to verify the linear polarization-dependent focusings at 200 THz. The work provides a novel platform for near-infrared integrated photonics.
ANNALEN DER PHYSIK
(2023)
Article
Physics, Multidisciplinary
Canhui He, Zimo Pan, Zhengyong Song
Summary: This paper presents a spin-dependent plasmonic metasurface for manipulating circularly polarized waves. By tuning the dimension and rotation angle of the meta-atoms, the propagating phase and geometric phase are synthesized, enabling control of vortex beams under different spin incidences. This approach provides a new solution for nanophotonic devices and systems.
ANNALEN DER PHYSIK
(2023)
Article
Physics, Applied
Jinxin Yang, Zekai Zhou, Zhengyong Song
Summary: This research presents a method of noninterleaved spin-selective metasurfaces, which combines geometric phase and propagating phase to achieve independent phase control and imaging at desired angles. Two broadband plasmonic metasurfaces are designed for multichannel holographic imaging in the near-infrared band.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Chaoxian Tang, Canhui He, Changqing Li, Zhengyong Song
Summary: Vanadium dioxide (VO2) is used to achieve dynamic tuning of holograms in the terahertz band. VO2 meta-atoms composed of a VO2 block, silica spacer, and gold substrate are designed to manipulate phase and amplitude. Three types of metasurfaces are designed to manipulate holograms, enabling state switching of the hologram generator, hologram deflection, and multi-beam hologram. This research has potential applications in optical holography and information privacy.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Jinhao Xin, Zhiqiang Du, Zekai Zhou, Zhengyong Song
Summary: This paper presents three plasmonic metasurfaces, which implement multiple functions including normal reflection, focused beam, anomalous reflection, and computational focusing, on a single plasmonic metasurface. By fine-tuning the geometric dimensions and orientation angle of the meta-atom, the geometric phase is combined with the propagation phase to produce an independent phase response, providing novel approaches for the integration of multifunctional EM modulation.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
