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
Optics
Baoku Wang, Ke Gai, Ruoxing Wang, Fei Yan, Li Li
Summary: This paper presents an interesting scheme of an ultra-broadband perfect terahertz (THz) absorber using a periodic-conductivity graphene metasurface. By modulating the conductivity of graphene in a periodic manner, the absorber can generate dense high-order resonance modes and achieve ultra-broadband continuous absorption. This scheme is significant for the development of broadband THz absorbers and has promising application prospects in THz stealth, imaging, and communication fields.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Fuyin Ma, Hao Zhang, Xingzhong Wang, Chongrui Liu, Jiu Hui Wu
Summary: A space-shift phase-coherent cancellation acoustic metasurface is proposed to achieve broadband low-frequency sound absorption. By using an ultra-thin integrated structure composed of multiple units with weak absorption capability, the large-size required for low-frequency absorption is transformed into an extremely thin space layer through a space-shift design. The proposed metasurface demonstrates excellent sound absorption performance with a compact design and a thickness limitation that satisfies most equipment requirements. Rating
Article
Engineering, Multidisciplinary
Shobhit K. Patel, Juveriya Parmar, Vijay Katkar, Fahad Ahmed Al-Zahrani, Kawsar Ahmed
Summary: This study proposes a metasurface solar absorber based on the phase-changing material Ge2Sb2Te5, which shows enhanced absorption in the visible, infrared, and ultraviolet regions. Machine learning algorithms are used to predict the absorption values for different wavelengths, and experimental results demonstrate the efficacy of using a lower K value for prediction accuracy.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Qinyu Qian, Chinhua Wang, Li Fan, Liwen Cheng, Haitao Chen, Liang Zhao
Summary: This article introduces an ultra-broadband metasurface perfect absorber based on triple Mie resonances from three sets of nanopillars, suitable for visible and NIR region with high absorption and wide angular-insensitivity. Fabrication of the metasurface structures is efficiently achieved through double-beam UV interference lithography and sputter coating depositions. Experimental results show high absorption rates averaging 0.961 in the wavelength band from 400 to 1800 nm.
Article
Acoustics
Nansha Gao, Baozhu Wang, Kuan Lu, Hong Hou
Summary: The study optimized the average sound-absorption coefficient of an ultra-broadband parallel sound absorber using a teaching-learning-based optimization algorithm under certain conditions, achieving a high absorption coefficient of 0.9255. By optimizing the lengths of the lateral and micro-perforated plates, the surface impedance of the structure closely matched the surrounding air.
Article
Physics, Applied
Jingda Wen, Qiang Ren, Ruiguang Peng, Qian Zhao
Summary: This paper presents a water-based metasurface absorber capable of ultra-broadband absorption in both microwave and infrared radiation, with potential applications in EM radiation prevention, stealth technology, and energy harvesting. The absorber achieves over 90% polarization-insensitive and wide-angle absorption from 7.2 to 100 GHz, with a relative bandwidth of 173%. It also offers tunable absorption and infrared radiation with thermally tunable absorption, making it suitable for practical shaped structures in both civil and military domains.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Mostafa Abdelsalam, Mohamed A. Swillam
Summary: This study discusses a new structure of nanoprisms made of doped silicon that can act as an ultra-broadband absorber for thermo-electric generation. The effect of doping concentration and a pure silicon thin film on top of the prisms are also explored. An optimized structure is found that can absorb 92.6% of input power from 1 to 15 μm.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Zhipeng Ding, Wei Su, Hong Wu, Wenlong Li, Yuanhang Zhou, Lipeng Ye, Hongbing Yao
Summary: This article proposes a novel single-layered graphene metasurface absorber (GMSA) that achieves thinness, lightness, broadband, high absorption, and tunability. The GMSA differs from common hybrid patterns by adopting a graphene layer with a simple multi-square ring structure. The simulation results show that the GMSA can achieve broadband absorption in the terahertz frequency range, making it suitable for various applications.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Yujie Zhong, Yi Huang, Shuncong Zhong, Tingting Shi, Fuwei Sun, Tingling Lin, Qiuming Zeng, Ligang Yao, Xuefeng Chen
Summary: This study achieves frequency-agile absorption adjustments by utilizing the coupling between total reflection prism and electrically-driven MoS2. The redistribution of electric field and susceptible dielectric response are found to be attributed to limited spatial near-field perturbation. The study also demonstrates that perturbed MoS2 plasmon modes promote the formation of dual-phase singularities to suppress attenuation of absorption amplitude, extending the relative tuning range.
Article
Optics
Z. H. E. N. G. Q. Liu, G. U. I. Q. I. A. N. G. Liu, X. I. A. O. S. H. A. N. Liu, J. I. N. G. Chen, C. H. A. O. J. U. N. Tang
Summary: A 200-nm-thick random metasurface composed of refractory metal nanoresonators is demonstrated to achieve spatial and frequency-selective optical field coupling and absorption. The resonant optical field is found to be concentrated in different spatial areas depending on the frequency, enabling artificial manipulation of spatial coupling and optical absorption through spectral frequency. These methods have wide applicability and potential in frequency-selective nanoscale optical field manipulation.
Article
Materials Science, Multidisciplinary
Qing Xiong, Honghao Yu, Ye Zhang, Xiangyu Gao, Changhong Chen
Summary: A broadband all-dielectric metasurface absorber was presented, with elliptical nanohole arrays embedded in the doped device layer of a silicon-on-insulator wafer, achieving enhanced near infrared absorption. Magnetic dipole resonances were found to predominantly contribute to the absorption enhancement through detailed multipole decomposition, and the large bandwidth was attributed to the superposition of multiple absorption peaks from the resonances. This simple absorber design, compatible with CMOS techniques, shows potential for broadband photodetectors of Si and even Ge, where photocarrier excitation originates from interband transitions in Ge-based photodetectors.
RESULTS IN PHYSICS
(2021)
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
Engineering, Electrical & Electronic
Senfeng Lai, Yanpei Guo, Guiyang Liu, Yang Liu, Chen Fu, Huiyu Chang, Yanghui Wu, Wenhua Gu
Summary: This high-performance microwave absorber offers ultra-broadband absorption, mechanical flexibility, and high optical transparency, with an absorption rate of over 90% and over 99% in the range of 30 GHz to 33.6 GHz.
IEEE PHOTONICS JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Yuwei Huang, Kelson Kaj, Chunxu Chen, Zhiwei Yang, Sheikh Rubaiat Ul Haque, Yuan Zhang, Xiaoguang Zhao, Richard D. Averitt, Xin Zhang
Summary: This article introduces a thin membrane silicon metasurface absorber that achieves very high absorption over a bandwidth of approximately 500 GHz. The absorber can be used in terahertz devices such as detectors, modulators, and switches.
Article
Physics, Applied
Danwei Liao, Zichong Yue, Zhiwang Zhang, Hai-Xiao Wang, Ying Cheng, Xiaojun Liu
Summary: This study establishes the connection between acoustic Tamm mode and typical topological acoustic mode, and observes the existence and variation of Tamm edge modes and Tamm corner modes through experimental and numerical simulations. The findings are significant for the development of acoustic functional devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Yuanzhou Zhu, Houyou Long, Chen Liu, Haixiao Zhang, Ying Cheng, Xiaojun Liu
Summary: Recent progress in minimizing sound absorbers has led to the development of compact devices for low-frequency sound. A new ultra-thin metasurface has been constructed, achieving extreme absorption asymmetry at the scattering eigenvalue's exceptional point. Through the parallel connection of resonators with high dissipation loss and a non-resonant reactance-dominated boundary with high radiation loss, a deep subwavelength absorber with exceptional absorption characteristics has been realized. The proposed strategy provides a degree of freedom for design and demonstrates excellent robustness against geometrical reconfigurations.
APPLIED PHYSICS LETTERS
(2022)
Article
Acoustics
Baoguo Yuan, Jiyu Liu, Houyou Long, Ying Cheng, Xiaojun Liu
Summary: This work proposes a scheme and demonstrates a planar acoustic Luneburg lens that can focus broadband sound without aberration. The refractive indexes of the lens are obtained from acoustic metamaterials, and the lens is fabricated using 3D printing technology. The experimental results agree well with numerical simulations, and the lens is further utilized to construct a wide-angle acoustic reflector.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Physics, Multidisciplinary
Zichong Yue, Zhiwang Zhang, Hai-Xiao Wang, Wei Xiong, Ying Cheng, Xiaojun Liu
Summary: Research on the application of higher-order topological insulators in acoustic systems is highly significant. This study proposes a new design scheme for acoustic SOTIs and observes the state switching process experimentally. The results demonstrate the robustness of topological corner states in the presence of defects.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Applied
Taimin Wang, Chun Gong, Suying Zhang, Yuanzhou Zhu, Houyou Long, Ying Cheng, Xiaojun Liu
Summary: Emerging artificial acoustically soft boundaries (ASBs) have great potential for sound absorptive devices. However, current ASBs have narrow-band limitations that require stringent matching of resonant characteristics. This study proposes a method to construct a broadband ASB (BASB) by coupling two multi-band ASBs using coiled space resonators (CSRs), achieving ultra-broadband absorption.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Chen Liu, Zhiwang Zhang, Danwei Liao, Zichong Yue, Chengrong Ma, Ying Cheng, Xiaojun Liu
Summary: Over the recent decade, topological insulators have become a focus of research in the field of acoustics due to their unique properties for manipulating wave propagation. However, most studies currently are reported in a complex context, and it is still a challenge to achieve efficient acoustic rainbow trapping in a straightforward setup.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Bolun Hu, Zhiwang Zhang, Zichong Yue, Danwei Liao, Yimin Liu, Haixiao Zhang, Ying Cheng, Xiaojun Liu, Johan Christensen
Summary: The Su-Schrieffer-Heeger (SSH) model is a fundamental framework in condensed-matter topology, specifically for studying spinless electrons in chains with staggered bonds. The chiral symmetry of this model ensures the existence of surface states at zero energy within the energy gap. Symmetry plays a crucial role in artificial materials subjected to parity and time-reversal operations. In this study, we introduce the concept of anti-PT (APT) symmetric systems in an acoustic SSH lattice with gain and loss components. Our experiments demonstrate the importance of non-Hermitian phase in the topological defect states, where broken symmetry suppresses them and intact PT or APT symmetry leads to damped or evanescent decay, respectively.
PHYSICAL REVIEW LETTERS
(2023)
Article
Acoustics
Xuemei Ren, Qinxin Zhou, Jie Huang, Zheng Xu, Xiaojun Liu
Summary: This paper discusses a technique to simultaneously modulate the amplitude and phase of ultrasonic waves using holographic method with high transmission efficiency and accuracy. An Airy beam with high propagation invariance is generated based on this technique, and the advantages and disadvantages of the proposed method are compared with the conventional acoustic holographic method. Furthermore, a sinusoidal curve with a phase gradient and a constant pressure amplitude is designed to achieve the transportation of a particle on a water surface along the curve.
Article
Physics, Applied
Qinxin Zhou, Xuemei Ren, Jie Huang, Zheng Xu, Xiaojun Liu
Summary: To achieve precise modulation of ultrasonic beams, we developed a Fourier-transform acoustic beam-shaping system. This system reconstructs the wave front and optimizes the shape of the beam for amplitude and phase modulation. We conducted experiments to generate different types of beams and successfully generated a perfect acoustic vortex beam for flexible and accurate manipulation of particles.
PHYSICAL REVIEW APPLIED
(2023)
Article
Nanoscience & Nanotechnology
Fangfang Ju, Chen Liu, Ying Cheng, Shengyou Qian, Xiaojun Liu
Summary: This study extends parity-time symmetric systems to acoustics by using coupled Mie resonators, achieving PT symmetry with only passive materials. Coherent perfect absorption is observed in the PT symmetric phase, showcasing potential applications in tunable noise control and acoustic modulators.
Article
Physics, Applied
Qiuqin Mao, Weiwei Zhao, Zilong Zou, Xiaoqin Qian, Chao Tao, Xiaojun Liu
Summary: Researchers propose a virtual-transducer-based method to address the challenges of asymmetric spatial resolution and artifacts in volumetric photoacoustic imaging based on a one-dimensional array. Simulation and experimental results demonstrate excellent symmetric resolution and low artifact performance, indicating the potential biomedical application value of this method.
APPLIED PHYSICS LETTERS
(2023)