Article
Multidisciplinary Sciences
Theodor S. Becker, Dirk-Jan Van Manen, Thomas Haag, Christoph Baerlocher, Xun Li, Nele Boersing, Andrew Curtis, Marc Serra-Garcia, Johan O. A. Robertsson
Summary: This paper presents a method for achieving active acoustic cloaking and holography without prior knowledge of the wavefield, allowing objects to remain invisible and illusions intact even for broadband moving sources. This opens up previously inaccessible research directions and facilitates practical applications such as architectural acoustics, education, and stealth.
Article
Physics, Applied
Junjie Zhan, Yujian Mei, Kai Li, Yi Zhou, Jian Chen, Yungui Ma
Summary: In this work, a bi-physical metamaterial invisible coating technique is proposed, which can effectively hide underwater objects from being detected via both magnetic fields and acoustic waves. This technique has the potential for important applications in military and civilian fields.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Ruijia Xu, Xiaocan Xu, Bo-Ru Yang, Xuchun Gui, Zong Qin, Yu-Sheng Lin
Summary: The integration of MEMS with metamaterial has provided a novel route to achieve programmability, and the use of switchable metamaterial in a MEMS-based metadevice demonstrates multifunctional characteristics, capable of performing logic operations of OR and AND gates simultaneously.
PHOTONICS RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Yong Pan, Lun Huang, Wei Sun, Dangli Gao, Long Li
Summary: An anti-near-infrared detection CoGaZnSe multilayer film was designed and prepared using pulsed laser deposition technology, successfully reducing the quantum efficiency of infrared detection and showing a significant effect on wool materials. This research offers new ideas and methods for stealth technology and materials, enhancing the efficiency of anti-infrared detection and potential applications in military, detection, and stealth technology.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Farhang Loran, Ali Mostafazadeh
Summary: This study provides a precise characterization of a higher-dimensional generalization of the unidirectional invisibility effect and identifies the conditions for its realization in scalar and electromagnetic wave scattering. The approach allows for the construction of potentials and linear dielectric media that exhibit perfect directional invisibility in a finite frequency domain.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Mansour Zaremanesh, Ali Bahrami
Summary: This study proposes a concentric cylindrical cloak structure for achieving acoustic cloaking phenomenon. By optimizing the shell design and using a composite lattice structure, the scattering of objects can be greatly reduced, simplifying the fabrication process of cloaking shells.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Jing Zhao, Xianfeng Wu, Di Cao, Mingchao Zhou, Zhijie Shen, Xiaopeng Zhao
Summary: This study presents a novel optical metamaterial that achieves negative refraction and inverse Doppler effect across most of the visible spectrum. The metamaterial is randomly assembled using a bottom-up approach and features narrowband, omnidirectional, and ultra low-loss characteristics.
PHOTONICS RESEARCH
(2023)
Article
Optics
Ming Zhang, Najiao Zhang, Peng Dong, Lin Yang, Baozhu Wang, Ruihong Wu, Weimin Hou
Summary: With the rapid advancement of modern technology and radar detection systems, electromagnetic (EM) stealth technology has become increasingly significant, particularly in aircraft stealth and military radar applications. In this work, an all-metal metasurface is designed for broadband terahertz radar cross-section (RCS) reduction and infrared invisibility. The proposed method combines MATLAB and CST simulations with a genetic algorithm to optimize the random phase distribution of metasurfaces and achieve high performance. The results show that the metasurface can simultaneously achieve broadband terahertz RCS reduction and infrared invisibility in specific frequency ranges.
Article
Optics
Yichao Liu, Fei Sun, Yibiao Yang, Yuying Hao, Shaowei Liang, Zheng Wang
Summary: A full space omnidirectional cloak is designed by thrice coordinate transformations inside the optic-null medium (ONM) shell. The cloak can be realized using subwavelength dielectric channels and metallic plates, along with a uniform dielectric restoring core in air, without the need for metamaterials or waveguide structures. The electromagnetic parameters of the cloak are strict in accordance with transformation optics, resulting in a nearly perfect omnidirectional cloaking effect achieved by natural materials at the design frequency. The shape, size, and position of the concealed region can be freely adjusted due to the transformation-invariant feature of the ONM.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Physics, Applied
Kyu-Tae Lee, Chengang Ji, Hideo Iizuka, Debasish Banerjee
Summary: Optical invisibility, a scientific journey that has intrigued humankind for over a century, has seen recent advancements in various limited cloak designs in narrowband microwave, infrared, and optical wavelengths. Efforts are being made to overcome traditional limitations and achieve wider operation, while also exploring the possibilities of unidirectional cloaking.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Maixia Fu, Jinyi Wang, Shaoshuai Guo, Zhaoying Wang, Pengxu Yang, Yingying Niu
Summary: A polarization-insensitive broadband terahertz absorber with a sandwich structure of metal-dielectric-graphene has been designed and simulated. The absorption performance is enhanced by altering the physical dimensions of the graphene pattern and actively adjusted by changing the chemical potential of graphene. The proposed absorber offers broad relative bandwidth, high absorption rate, polarization insensitivity, and a wide incident angle, making it potentially useful in terahertz technology applications such as imaging, detection, and cloaking.
Article
Optics
Francisco J. Diaz-Fernandez, Javier Marti, Carlos Garcia-Meca
Summary: Invisibility cloaks are a significant development in the field of metamaterials. While most efforts have been focused on improving the effectiveness of cloaks, little attention has been paid to the development of efficient techniques for detecting invisibility devices. This study proposes a different approach using diffraction tomography to enhance efficiency in detecting and obtaining images of invisibility cloaks, leading to improved sensitivity and potential application in sound cloaks.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Multidisciplinary
Cheng-Fu Yang, Li-Jun Yun, Jun-Wei Li
Summary: A reusable reciprocal invisibility and phantom device is proposed and designed based on multi-folded transformation optics and equivalent components. The device has homogeneous material parameters and does not require any anti-object to hide the target, breaking through the limitations of previous reciprocal cloak designs. The device also has a perfect illusion effect, which can confuse detection radars while hiding the target. Additionally, the open structure of the device allows the target object to exchange materials and transfer information with the outside world, enabling stealth or phantom of new target objects without changing any parameters of the device.
Article
Materials Science, Multidisciplinary
Sajad Eslamzadeh, Mohsen Ghaffari-Miab, Bijan Abbasi-Arand
Summary: This paper presents an acoustic cylindrical-to-plane-wave conversion system based on metamaterials, which utilizes a broadband lens and has potential applications in a wide frequency range for sonar systems and biomedical imaging.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Multidisciplinary Sciences
V Kozlov, D. Vovchuk, P. Ginzburg
Summary: This study proposes a new method to address the issue of concealing targets from radar systems from a signal-processing standpoint.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Jie Han, Yuehong Xu, Huifang Zhang, Yuanhao Lang, Xiaohan Jiang, Xieyu Chen, Xi Feng, Li Niu, Yanfeng Li, Xueqian Zhang, Quan Xu, Quan Li, Jiaguang Han, Weili Zhang
Summary: A new directional coupling strategy for controlling surface plasmons (SPs) by utilizing interference effects between different resonance responses of slit resonators is introduced. The strategy demonstrates versatile design capability and flexibility in various polarized incidence situations. This approach paves the way for practical on-chip applications in developing innovative and on-demand plasmonic devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
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
Rihan Hai, Guangbin Shao, Henry Oliver T. Ware, Evan Hunter Jones, Cheng Sun
Summary: The past decade has seen significant progress in miniaturizing optical imaging systems. Challenges still remain in manufacturing and assembling the optomechanical components. This study reports the use of 3D printing for digitalized optomechanical component manufacturing, reducing part count, and including passive alignment features to facilitate system assembly. A penny-sized accommodating optical microscope with 3D printed optomechanical components demonstrates its ability to focus on specimens at different distances and extends depth of field with focus stacking. This microscope can be customized and manufactured rapidly to meet specific needs in form and optics.
ADVANCED MATERIALS
(2023)
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
Instruments & Instrumentation
Ki-Hee Song, Cheng Sun, Hao F. Zhang
Summary: Spectroscopic single-molecule localization microscopy (sSMLM) has become a key tool in functional super-resolution imaging by providing spatial and spectral information of single molecules at nanoscale resolution. A recently developed dual-wedge prism (DWP) imaging spectrometer has expanded the accessibility of sSMLM with improved imaging resolution and system reliability. Understanding the key system parameters is crucial for optimizing the DWP imaging spectrometer and achieving better multi-color functional imaging.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Review
Nanoscience & Nanotechnology
Youngseop Lee, Hao F. Zhang, Cheng Sun
Summary: Photoacoustic imaging enables noninvasive volumetric imaging of biological tissues by capturing the endogenous optical absorption contrast. Polymer micro-ring resonators (MRRs) in the form of integrated photonic circuits (IPC) offer a promising solution for ultrasound detection in PA imaging. The continued engineering innovation has further expanded the applications of MRRs, including multi-modality optical microscope, PA endoscope, and photoacoustic computed tomography (PACT).
Article
Chemistry, Multidisciplinary
Wei-Hong Yeo, Yang Zhang, Amy E. Neely, Xiaomin Bao, Cheng Sun, Hao F. Zhang
Summary: Single-molecule localization microscopy (SMLM) allows visualization of cellular nanostructures in vitro with sub-20 nm resolution. However, understanding the structural information from SMLM images has been challenging. To address this, a Monte Carlo (MC) simulation based on experimental imaging parameters was developed to generate synthetic SMLM images. This MC model was used to optimize a clustering algorithm for the separation of fluorescently labeled nuclear pore complex (NPC) proteins and to generate cellular substructures with different angles of labeling.
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)
