Article
Nanoscience & Nanotechnology
Maosheng Yang, Tengteng Li, Xin Yan, Lanju Liang, Haiyun Yao, Zhaoqing Sun, Jing Li, Jie Li, Dequan Wei, Meng Wang, Yunxia Ye, Xiaoxian Song, Haiting Zhang, Jianquan Yao
Summary: This study presents a dual-optoelectronic metadevice that integrates different materials to achieve ultra-wideband and multidimensional manipulation of higher-order Fano resonances, showing different manipulation behavior in thermal imbalance state. The device exhibits remarkable performance in modulation depth, resonant frequency shift, and tunable frequency range.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
Zongtang Zhang, Hung Luyen, John H. Booske, Nader Behdad
Summary: The study introduces a dual-band reflectarray antenna capable of generating two beams at X and Ku bands with independent control of their maximum radiation directions. By using new dual-band polarization-rotating unit cells, independent phase control is achieved for the two frequency bands.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Optics
Tong Wu, Huifang Zhang, Sivaloganathan Kumaran, Yuehong Xu, Qingwei Wang, Wladislaw Michailow, Xueqian Zhang, Harvey E. Beere, David A. Ritchie, Jiaguang Han
Summary: In this study, we propose and experimentally demonstrate several spin-dependent wavefront control metasurfaces using all-silicon dielectric structures. These metasurfaces are easy to fabricate and have potential applications in terahertz optical systems and communication systems.
PHOTONICS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Dongjie Wang, Xunjun He, Bowen Yang, Jiuxing Jiang, Yongtao Yao, Guangjun Lv
Summary: Graphene-functionalized metasurfaces have the potential to actively control linearly polarized waves in the terahertz region, enabling anomalous reflection and amplitude tuning. They can be applied in THz telecommunications, high-resolution THz displays, and advanced THz imaging devices.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Kamalesh Jana, Emmanuel Okocha, Soren H. Moller, Yonghao Mi, Shawn Sederberg, Paul B. Corkum
Summary: This study demonstrates the use of structured light instead of structured materials to construct metasurfaces, transferring structure from light to transient currents in a semiconductor. The spatial light modulator is utilized to control the spatial structure of currents and resulting terahertz radiation with exceptional flexibility, enabling the metasurface to be reconfigured with unprecedented flexibility.
Article
Optics
Shuangqi Zhu, Bowen Dong, Guanxuan Guo, Xueguang Lu, Quan Xu, Jiaguang Han, Wanxia Huang, Hua Ma, Yongtian Wang, Xueqian Zhang, Lingling Huang
Summary: This paper proposes a dynamic THz metasurface combined with the phase-change material VO2 that can be thermally controlled for optical encryption. By arranging antennas in advance and utilizing the electromagnetically induced transparency effect, a secret image can be encoded into the metasurface. When the temperature exceeds the phase-change temperature, the encrypted hologram can be reconstructed. With the distinct characteristics of VO2, the phase-change temperature required for decryption is not very high, and the entire process is reversible. It is expected that such metasurfaces can be practically applied to the next generation of optical encryption or optical anticounterfeiting in the future with updated processing technology.
LASER & PHOTONICS REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Qingqing Cheng, Juncheng Wang, Ling Ma, Zhixiong Shen, Jing Zhang, Xiaoying Zheng, Tao Chen, Ye Yu, Dong Yu, Qiong He, Wei Hu, Tao Li, Songlin Zhuang, Lei Zhou
Summary: By designing and fabricating an achromatic Airy-beam metalens, achromatic Airy beams with autofocusing and self-healing properties are successfully demonstrated, with a larger depth of focus. This paves the way for flat photonic devices for noninvasive biomedical imaging and light-sheet microscopy applications, with a numerical demonstration of a device protocol provided.
Article
Materials Science, Multidisciplinary
Zhipeng Zhang, Zhao Zhang, Zijin Tong, Mingyu Yang, Junneng Guan, Yaqi Jin, Chunhua Tan, Faqiang Wang, Zhongchao Wei, Hongyun Meng
Summary: In this paper, a multifunctional metalens with three operating modes is designed by combining the phase-change material antimony selenide (Sb2Se3) with the bilayer Pancharatnam-Berry (P-B) phase. The metalens can achieve arbitrary switching among different focus modes by reversibly transforming the nanofins between crystalline and amorphous states. The proposed metalens has high focusing efficiency and can be applied in various fields, such as biomedical imaging and optical communication systems.
RESULTS IN PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Zhenfei Li, Jurui Qi, Wenman Hu, Ji Liu, Jin Zhang, Linda Shao, Chiben Zhang, Xiong Wang, Ronghong Jin, Weiren Zhu
Summary: In this paper, a dispersion-assisted dual-phase hybrid strategy is proposed for dual-frequency independent control of amplitude and phase. By controlling dispersion and energy allocation, frequency and phase decoupling is achieved, and the design and verification of dual-frequency multi-focal point are demonstrated.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Optics
Yun Bo Li, He Li, Hai Peng Wang, Tie Jun Cui
Summary: The study proposes a method to shape radiated beams at two different wavelengths using a single-layer multiplexing holographic impedance metasurface, achieving broadside beams with different circular polarizations at two wavelengths. Experimental results confirm the effectiveness of the design, demonstrating that the proposed metasurface can effectively control the radiation performance at different wavelengths.
Article
Chemistry, Multidisciplinary
Zhedong Wang, Chao Qian, Zhixiang Fan, Hongsheng Chen
Summary: Polarization, a fundamental aspect of electromagnetic waves, is essential for various applications. Conventional methods for determining polarization state are bulky and complex. A new approach using neuro-metasurfaces enables direct polarization readout, manipulating orthogonal waves to synthesize arbitrary polarization waves. By designing specific output focus points, a unique polarization atlas allows intensity ratio to polarization state correspondence. Numerical simulation and microwave experiments validate the feasibility of this strategy, paving the way for integrated and multifunctional detectors.
Article
Chemistry, Multidisciplinary
Zhen Yue, Jingyu Liu, Jitao Li, Jie Li, Chenglong Zheng, Guocui Wang, Mingyang Chen, Hang Xu, Qi Wang, Xiaohua Xing, Yating Zhang, Yan Zhang, Jianquan Yao
Summary: This study introduces a novel technology based on dynamic phase and spatial interleaving unit arrangement for metasurfaces, enabling multiple wavefront manipulations including spin and linear polarization transformations. By designing a bifocal metasurface, various forms of wavefront manipulations can be achieved, offering a new platform for the development of terahertz integrated photonics.
Article
Nanoscience & Nanotechnology
Chenglong Zheng, Jie Li, Guocui Wang, Jingyu Liu, Jitao Li, Zhen Yue, Hongliang Zhao, Xuanruo Hao, Yating Zhang, Yan Zhang, Jianquan Yao
Summary: The study introduces a silicon bifunctional metasurface capable of independent amplitude and phase modulation in two circular polarized channels, demonstrating versatility and flexibility with results consistent with theoretical expectations. The proposed method has applications in dynamic holography, dynamic display, and other fields.
Article
Chemistry, Multidisciplinary
Yuehong Xu, Quan Xu, Xueqian Zhang, Xi Feng, Yongchang Lu, Xixiang Zhang, Ming Kang, Jiaguang Han, Weili Zhang
Summary: This study proposes a new design scheme using all-metal stereo U-shaped meta-atoms for efficient and broadband manipulation of terahertz polarization. The design is experimentally verified to demonstrate superior performance in polarization control and enriches the design freedom of polarization-related metasurfaces.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Optics
Shoujun Zhang, Xieyu Chen, Kuan Liu, Haiyang Li, Yuehong Xu, Xiaohan Jiang, Yihan Xu, Qingwei Wang, Tun Cao, Zhen Tian
Summary: This article introduces a nonvolatile, reconfigurable, and dynamic Janus metasurface using phase-change material Ge2Se2Te5 (GST) in the terahertz (THz) regime. The reversible switching characteristic of GST on large areas is demonstrated, and a multiplex metasurface scheme is proposed. Various applications such as dynamic beam splitter, bifocal metalens, and switchable metalens/focusing optical vortex generators are designed and experimentally characterized. The development of multifunctional and compact THz devices can be facilitated by this scheme.
PHOTONICS RESEARCH
(2022)
Article
Optics
Yi Liu, Chunmei Ouyang, Quan Xu, Jiajun Ma, Yanfeng LI, Jiaguang Han, Weili Zhang
Summary: This study investigates a magnetic moire hyperbolic metasurface in the terahertz region, which enables topological transition and a variety of magnetic moire effects. The results have important implications for applications in quantum physics, energy transfer, and planarized magnetic plasmonic devices.
Article
Materials Science, Multidisciplinary
Xi Feng, Xieyu Chen, Yongchang Lu, Qingwei Wang, Li Niu, Quan Xu, Xueqian Zhang, Jiaguang Han, Weili Zhang
Summary: This paper proposes and experimentally demonstrates a new method for directly emitting focused THz vortex beams with desired orbital angular momentums. The method utilizes patterned ITO film to generate nonlinear THz emission, achieving effective integration of THz emission and vortex-beam generation.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Tong Wu, Quan Xu, Xueqian Zhang, Yuehong Xu, Xieyu Chen, Xi Feng, Li Niu, Fan Huang, Jiaguang Han, Weili Zhang
Summary: Light is a complex vectorial field characterized by its amplitude, phase, and polarization properties. This study proposes a new metasurface paradigm that can manipulate the amplitudes and phases of two spin components using only two different meta-atoms based on the interference effect. Two five-channel meta-holograms for imaging and information encryption are designed and experimentally characterized to demonstrate the potential of the interference method in achieving compact complex and multifunctional meta-devices.
Article
Optics
Xiaolin Zhuang, Wei Zhang, Kemeng Wang, Yangfan Gu, Youwen An, Xueqian Zhang, Jianqiang Gu, Dan Luo, Jiaguang Han, Weili Zhang
Summary: A C-shape-split-ring-based phase discontinuity metasurface with a liquid crystal elastomer substrate is introduced for infrared modulation of terahertz wavefront. By manipulating the deflection of the substrate, controllable and broadband wavefront steering is achieved, with a maximum output angle change of 22 degrees at 0.68 THz. The liquid crystal elastomer metasurface also demonstrates the performance of a beam steerer, frequency modulator, and tunable beam splitter, which are highly desired in terahertz wireless communication and imaging systems.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Fan Huang, Quan Xu, Wanying Liu, Tong Wu, Jianqiang Gu, Jiaguang Han, Weili Zhang
Summary: A method for generating superposed optical vortices in the terahertz frequency range with orthogonal circular polarization incidences is proposed and demonstrated. This method provides opportunities for developing ultracompact terahertz functional devices.
PHOTONICS RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Qingwei Wang, Xueqian Zhang, Quan Xu, Xi Feng, Yongchang Lu, Li Niu, Xieyu Chen, Eric Plum, Jianqiang Gu, Quanlong Yang, Ming Fang, Zhixiang Huang, Shuang Zhang, Jiaguang Han, Weili Zhang
Summary: Coupling between different meta-atoms within the unit-cell can be used to control nonlinear THz generation, where achiral coupling provides control over THz field amplitude and chiral coupling makes THz generation sensitive to pump polarization. Multiplexed pump-handedness-selective nonlinear metasurfaces can be realized, allowing for the generation of THz beams with different orbital angular momentum. This approach enables the development of various integrated nonlinear THz devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yi Xu, Jianqiang Gu, Yufei Gao, Quanlong Yang, Wanying Liu, Zhibo Yao, Quan Xu, Jiaguang Han, Weili Zhang
Summary: This study presents a novel meta-atom scheme using a silicon-silica-silicon sandwich-shaped structure, which enlarges the propagation phase and improves the dispersion engineering capability at low losses. An achromatic metalens is constructed using these meta-atoms, which exhibits remarkable achromatic focusing performance in the THz domain. This research not only demonstrates an outstanding terahertz achromatic metalens but also provides innovative ideas for constructing achromatic metasurfaces in various applications, beyond the THz domain.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Applied
Jiajun Ma, Chunmei Ouyang, Yuting Yang, Hongyi Li, Li Niu, Xinyue Qian, Yi Liu, Bin Yang, Quan Xu, Yanfeng Li, Liyuan Liu, Zhen Tian, Jianqiang Gu, Jiaguang Han, Weili Zhang
Summary: Topological photonics has advanced from theoretical concept to practical applications, with valley topological photonic crystals being a key candidate for future functional devices. However, the design and arrangement limitations have hindered the exploration of multichannel valley topological beam splitters. In this study, we investigate and demonstrate the robustness of different domain walls in valley topological photonic crystals and present a highly integrated multichannel valley topological beam splitter. Compared to traditional beam splitters, it is more robust, compact, and offers higher integration and more output ports. This brings new opportunities for engineering the flow of light and designing miniaturized integrated photonic devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Guanxuan Guo, Xueqian Zhang, Li Niu, Tong Wu, Xieyu Chen, Quan Xu, Jiaguang Han, Weili Zhang
Summary: We propose a programmable graphene metasurface based on the quantum effect analogue, electromagnetically induced transparency, which enables continuous amplitude and phase tuning of cross-polarized transmission in the terahertz (THz) regime. This programmable scheme allows flexible control over the diffraction angles and focal lengths of the transmitted THz beams, providing new inspirations for THz programmable metasurface devices.
Article
Chemistry, Physical
Jiaqi Zhang, Yuyue Yan, Hongwei Zhao, Xudong Niu, Liyuan Liu, Chunmei Ouyang, Weili Zhang
Summary: The GHz and THz complex dielectric spectra of a polyethylene glycol dimethyl ether (2000 g/mol) aqueous solution were investigated. The reorientation relaxation of water in this type of macro-amphiphilic molecule solution can be well described by three Debye models: under-coordinated water, bulk-like water, and slow hydrating water. The reorientation relaxation timescales of bulk-like water and slow hydration water both increase with concentration. By calculating the experimental Kirkwood factors of bulk-like and slow hydrating water, the changes in their dipole moments were estimated. The estimated water molecule numbers of three water components around monomers also support the sorting of water components.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Optics
Xiaohan Jiang, Quan Xu, Yuanhao Lang, Wanying Liu, Xieyu Chen, Yuehong Xu, Hang Ren, Xibin Wang, Su Xu, Xueqian Zhang, Chunmei Ouyang, Zhen Tian, Jianqiang Gu, Jiaguang Han, Weili Zhang
Summary: Geometric phase metasurfaces, a branch of meta-optics, have gained significant attention in recent years. The concept has been extended to near-field regime for the control of surface plasmons (SPs) by rotating dipole sources. However, there are still puzzles and shortcomings, such as the explanation for the reported geometric phases equal to the rotation angle and twice the rotation angle of the dipole sources for SP controls, and the limited control strategies for a single wavelength. In this study, a rigorous derivation of SP excitation by circularly polarized illumination is performed, clarifying the rotation dependence and coordinate correlation of geometric phase control of SPs. Furthermore, a holographic approach is proposed to implement multiplexed geometric phase control, demonstrating the ability to couple and steer incident circular polarizations of different wavelengths and spin directions to specific SP focusing beams. This work paves the way for integrated and multiplexed SP devices.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Min Zhang, Shoujun Zhang, Qingwei Wang, Yihan Xu, Liwen Jiang, Yuyue Yan, Jiao Li, Zhen Tian, Weili Zhang
Summary: An ultrathin, flexible terahertz metamaterial based on biogel has been developed to detect the transmission of terahertz waves through biomolecules in aqueous solutions. The metamaterial can detect glucose in water, human serum, and human sweat with high sensitivity and can be used for long-term management of diabetes as a wearable device.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Jiaqi Zhang, Yuyue Yan, Bin Wang, Liyuan Liu, Shaoxian Li, Zhen Tian, Chunmei Ouyang, Jianqiang Gu, Xueqian Zhang, Yu Chen, Jiaguang Han, Weili Zhang
Summary: This study investigated the reorientational dynamics of water molecules in the hydration shell of HPEI using dielectric relaxation spectroscopy. The results showed that different types of water molecules exhibited different time scales, and the hydrophilic amino groups of HPEI influenced the time scales of water molecules.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Wanying Liu, Quanlong Yang, Quan Xu, Xiaohan Jiang, Tong Wu, Jianqiang Gu, Jiaguang Han, Weili Zhang
Summary: This article introduces an all-dielectric multifunctional metasurface for generating multichannel terahertz vortex beams, realizing quasi-perfect vortex beams with controllable divergence angles. This method has a smaller divergence angle and thinner ring width compared to conventional vortex beams, providing a new approach for generating vortex beams in compact terahertz systems.
Article
Optics
Quan Xu, Xiaoqiang Su, Xueqian Zhang, Lijuan Dong, Lifeng Liu, Yunlong Shi, Qiu Wang, Ming Kang, Andrea Alu
Summary: Metasurfaces have enabled the realization of optical functionalities on an ultrathin platform, driving the field of flat optics. Traditional metasurfaces have static meta-atoms, while reconfigurable and programmable metasurfaces offer customized functionality with individually reprogrammable meta-atoms.
ADVANCED PHOTONICS
(2022)