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
Engineering, Electrical & Electronic
Changqing Li, Canhui He, Zhengyong Song
Summary: This paper presents a design of dynamically switchable metasurfaces based on phase change material-vanadium dioxide. The metasurfaces consist of vanadium dioxide blocks, silicon dioxide spacer, and gold film. By changing the size of the vanadium dioxide block, a gradient metasurface with 360 degrees phase modulation capability is achieved. The design allows for switching between anomalous reflection and specular reflection, and can generate beams with different orbital angular momenta.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Ruixing Nie, Canhui He, Runxuan Zhang, Zhengyong Song
Summary: Reflective meta-atoms based on vanadium dioxide (VO2) are designed to achieve wavefront reconfiguration in terahertz frequency. The meta-atoms provide full phase coverage and high polarization conversion efficiency when VO2 is in the metal state. However, when VO2 undergoes phase transition to the insulating state, the phase coverage and polarization conversion capability decrease significantly. Three metasurfaces, including anomalous reflector, met-alens, and vortex beam generator, demonstrate wavefront manipulation and polarization conversion abilities when VO2 is in the metal state. On the other hand, when VO2 is in the insulating state, the metasurfaces function as specular reflectors. Simulations verify the wavefront modulation and polarization control abilities of the proposed metasurfaces.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Taoming Lu, Jiong Wu, Zhaoyang Shen, Youcheng Wang, Houyuan Cheng, Yujun Li, Yuejie Yang, Helin Yang
Summary: The metasurface is a subwavelength structure-based ultra-thin device with strong light field control ability. In this article, a novel ultrathin metasurface is proposed, which can function as a beam splitter and controls the polarization of electromagnetic waves. Broadband operation and phase control are achieved based on geometric phase theory.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Chemistry, Multidisciplinary
Jiajia Chen, Xieyu Chen, Zhen Tian
Summary: This work presents a new strategy for the development of tunable terahertz chiral devices by studying a switchable chiral metasurface. The metasurface, based on a phase change material, can switch between left-handed and right-handed circularly polarized mirrors and find applications in polarization-dependent fields.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Yizhen Chen, Xiaoying Zheng, Feifei Liu, Weikang Pan, Zhuo Wang, Muhan Liu, Zhiyan Zhu, Yingying Wang, Liangwei Li, Qiong He, Lei Zhou, Shulin Sun
Summary: By constructing high-efficiency bifunctional metasurfaces, we have successfully generated two plasmonic vortices with distinct topological charges, which can find wide applications in on-chip photonics.
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
Engineering, Electrical & Electronic
Xujin Yuan, Zhenhong He, Xiuzhu Ye, Mingji Chen, Ying Li, Weiduan Li, Rui Zhang, Yixing Huang, Cunxi Liu, Xiaodong Cheng, Daining Fang
Summary: The paper introduces a wideband metamaterial ground cloak and validates its operational functions through experiments. A comparison between wideband and narrowband metamaterials shows the scattering improvement effect. Experimental results demonstrate the effectiveness of the proposed metamaterial within the gigahertz frequency range.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Materials Science, Multidisciplinary
Cheng Ni, Linhui Dong, Zhixiang Xu, Mucheng Wang, Ling Wu, Yongzhi Cheng
Summary: In this paper, a reflective metasurface composed of a dielectric substrate sandwiched with a double-split-ring (DSR) structure InSb and a metal ground plane was proposed to achieve high-efficient thermal switchability of circular-polarization (CP) conversion, anomalous reflection, and planar reflective focusing effect in a broadband manner in the terahertz (THz) region. The simulation results showed that the designed InSb metasurface structure can achieve high-efficient reflective CP conversion with a magnitude of over 0.8 on average from 0.7 THz to 1.55 THz under the external higher thermal condition (On state), while the magnitude is nearly zero under the external lower thermal condition (Off state). Furthermore, the proposed metasurface structure can achieve a high-efficient reflective CP conversion with an efficiency of about 0.7 under the On state and a 2π phase full coverage by adjusting the oriented rotation angle (α) of the DSR structure InSb. As proof of concept, two InSb metasurfaces were constructed to demonstrate the broadband switchable anomalous reflection phenomenon and reflective focusing effect based on Pancharatnam-Berry (PB) phase principle. The proposed metasurface has great potential for future THz wavefront modulation applications.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Jiashuai Xu, Wenwen Liu, Zhengyong Song
Summary: This paper presents a graphene-based coding metasurface for dynamic beam steering of terahertz waves, demonstrating its versatility in dynamically controlling electromagnetic waves. Experimental results verify the dynamic tunability of the proposed metasurface for various functionalities, showcasing its potential in terahertz wave applications.
IEEE PHOTONICS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Dongru Yang, Yongzhi Cheng, Fu Chen, Hui Luo, Ling Wu
Summary: In this paper, a broadband reflective metasurface (MS) with patterned graphene is proposed and numerically investigated for wavefront manipulation in the terahertz (THz) region. The unit-cell of the proposed reflective MS consists of a dielectric substrate, a single layer oval-hollow-structure (OHS) graphene, and a metal ground-plane, enabling cross-polarization conversion of circularly polarized (CP) waves in reflection mode. By changing the orientation angle of the OHS graphene, full 2 pi phase shifts of the reflected orthogonal CP wave can be achieved over a broadband frequency range with different Fermi energy levels (EF). Furthermore, the efficiency of reflection CP conversion is highly dependent on EF variation. Particularly, the efficiency of anomalous reflection and focusing effect of the reflective MS can be dynamically adjusted by changing EF. It has great prospects in THz applications such as communication and imaging.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Computer Science, Information Systems
Tianning Zhang, Chun Yun Kee, Yee Sin Ang, Erping Li, Lay Kee Ang
Summary: This paper presents an improved method for complex metasurface design using a deep learning model and network architecture search method. By combining spatial symmetry information, our method achieves significant improvements in identifying electromagnetic response locations and predicting response curves. It provides a platform for complex metasurface design problems.
Article
Physics, Multidisciplinary
Naitao Song, Nianxi Xu, Jinsong Gao, Xiaonan Jiang, Dongzhi Shan, Yang Tang, Qiao Sun, Hai Liu, Xin Chen
Summary: This paper proposes a method for achromatic generation of focused optical vortex beams with arbitrary homogeneous polarization states in the long-wave infrared. The method eliminates chromatic aberration and polarization sensitivity by superimposing a polarization-insensitive geometric phase and a dispersion-engineered dynamic phase. The feasibility of the method is validated and it may provide a new solution for chip-scale optical communication devices.
FRONTIERS IN PHYSICS
(2022)
Article
Optics
Xuzheng Zhu, Yongzhi Cheng, Fu Chen, Hui Luo, Wu Ling
Summary: This paper proposes an efficiency adjustable metasurface composed of bi-layered complementary Z-shaped structure graphene, which can control the terahertz wavefront's circular polarization in transmission mode. The simulation results demonstrate that the metasurface structure can achieve efficient circular polarization conversion and a full range of phase shift by adjusting the rotation angle of the graphene. Additionally, the adjustable graphene metasurface can realize anomalous refraction and planar focusing effects, and the efficiencies can be adjusted by changing the graphene's Fermi energy level. This research highlights the wide application prospects of adjustable graphene metasurfaces in communication, imaging, and other terahertz wavefront manipulation devices.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Simin He, Maoyan Wang, Hailong Li, Jian Zhang, Guiping Li, Xiaochuan Zhang, Jun Xu
Summary: In this study, the propagation matrix method (PMM) is developed to investigate the vortical dichroism (VD) of layered chiral media based on orbital angular momentum (OAM). By introducing the y component of the wavevector, the propagation matrices relating four eigenstates are derived and the VD of magnetoelectric coupling chiral media is calculated using the angular spectrum expansion method. The effects of chirality, permittivity, topological charge, and thickness on EM characteristics, including the VD for obliquely incident vortex waves of different polarizations, are studied. This finding opens up a promising avenue for detecting the chirality and permittivity of nonhomogeneous chiral structures through wavelength independent VD.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
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
Changqing Li, Canhui He, Zhengyong Song
Summary: This paper presents a design of dynamically switchable metasurfaces based on phase change material-vanadium dioxide. The metasurfaces consist of vanadium dioxide blocks, silicon dioxide spacer, and gold film. By changing the size of the vanadium dioxide block, a gradient metasurface with 360 degrees phase modulation capability is achieved. The design allows for switching between anomalous reflection and specular reflection, and can generate beams with different orbital angular momenta.
IEEE PHOTONICS JOURNAL
(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)
