Article
Materials Science, Multidisciplinary
Panpan Gao, Jianfeng Sun, Wenxuan Li, Chenxi Su, Zhuoyue Sun, Feng Xia, Kun Zhang, Lifeng Dong, Maojin Yun
Summary: We propose a temperature-tunable and dual-broadband switchable coherent perfect absorber (CPA) composed of an annulus-disk-shaped InSb pattern and a complementary graphene layer. By controlling the Fermi level of graphene, the temperature of InSb, or the relative phase of incident beams, the working frequency and absorption of the CPA can be continuously adjusted. The designed CPA exhibits broadband absorptance of over 90% in the frequency range of 0.145 THz to 1.24 THz, and can be thermally tuned in the THz region. Additionally, the absorptivity can be continuously varied between less than 1.2% and more than 90% in the dual-band and broadband modes by altering the relative phase of input beams.
RESULTS IN PHYSICS
(2023)
Article
Physics, Applied
Mohamed Farhat, Waqas W. Ahmad, Abdelkrim Khelif, Khaled N. Salama, Ying Wu
Summary: This study introduces an acoustic analog of laser with a proven amplification of over 10(4) at a frequency of a few kHz, utilizing the concept of coherent perfect absorber-laser. The obtained acoustic laser shows extremely high sensitivity and figure of merit, suggesting its potential for future acoustic pressure devices such as precise sensors.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Yevgeny Slobodkin, Gil Weinberg, Helmut Hoerner, Kevin Pichler, Stefan Rotter, Ori Katz
Summary: One of the key insights of non-Hermitian photonics is the concept of coherent perfect absorber (CPA), which can be achieved by reversing the operation of well-established concepts like lasers. This study demonstrates the possibility of overcoming the limitation of CPA by time-reversing a degenerate cavity laser based on a unique cavity that self-images any incident light field onto itself. The results show that placing a weak, critically coupled absorber into this cavity allows for nearly perfect absorption of any incoming wavefront, even complex and dynamically varying speckle patterns. This opens up new possibilities for applications in light harvesting, energy delivery, light control, and imaging.
Article
Optics
Pei Ju, Wenhui Fan, Wei Gao, Zhe LI, Qi Gao, Gang LI, Xiaoqiang Jiang, Tongyi Zhang
Summary: Based on coherent beam combining, this study proposes a method for generating perfect vectorial vortex beams (VVBs) using a specially designed radial phase-locked Gaussian laser array. The simulation results demonstrate successful generation of VVBs with correct polarization order and topological Pancharatnam charge. The diameter and thickness of the generated VVBs are independent of the polarization orders and topological Pancharatnam charges, further confirming their perfection. Additionally, the method allows for the generation of stable VVBs with elliptically polarized states by adjusting the intensity ratio between circularly polarized laser arrays.
Article
Engineering, Electrical & Electronic
Dwight W. W. Swett
Summary: The potential of Fourier transform infrared (FT-IR) on a chip as a disruptive technology for downhole chemical analysis in the oil and gas industry is discussed. The cooling requirements of conventional technologies have been a critical obstacle to downhole integration. A design and numerical analysis of an uncooled miniaturized Fourier transform mid-infrared (FTMIR) spectrometer compatible with downhole thermal environments is reported, featuring a metasurface detector/source combination derived from conformal mapping contours.
IEEE SENSORS JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Bingzhen Li, Yuhua Chen, Qingqing Wu, Yan Li, Yaxing Wei, Jijun Wang, Fangyuan Li, Xinwei Liu
Summary: A novel ultrathin narrowband metasurface absorber with bidirectional perfect absorption properties is proposed in this study, based on a tri-layer metal square-circular-square patch (SCSP) structure. Simulation results demonstrate a remarkable absorbance of 98.1% for the proposed absorber, which is consistent with experimental and theoretical calculations. The absorber exhibits stable wide-angle absorption properties for both TE and TM waves under various oblique incidence angles.
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, Multidisciplinary
Qiangguo Zhou, Wanli Ma, Tuntan Wu, Yongzhen Li, Qinxi Qiu, Jiaxin Duan, Jingbo Li, Lin Jiang, Wei Zhou, Yanqing Gao, Jingguo Huang, Zhiming Huang
Summary: In this paper, a metasurface terahertz perfect absorber with multi-frequency selectivity and good incident angle compatibility is designed and analyzed. The absorber exhibits five selective absorption peaks at different frequencies, and the effect of polarized electromagnetic wave modes and the size of the open rings on device performance is investigated. The designed metasurface absorber also shows excellent tunable modulation by adjusting two-dimensional materials and photosensitive semiconductor materials embedded in the unit structure. The results of this work have important implications for applications such as resonators, biodetection, beam-controlled antennas, hyperspectral thermal imaging systems, and sensors.
Article
Optics
Jianfeng Xie, Hanming Guo, Songlin Zhuang, Jinbing Hu
Summary: The perfect vortex beam generated using the propagation-phase method has high production efficiency and can be controlled in terms of radius and topological charge by adjusting polarization, making it useful in applications such as optical communication, particle trapping, and holographic display.
Article
Chemistry, Multidisciplinary
Qinyu Qian, Peiqing Sun, Cheng Zhang, Tingting Liu, Haitao Chen, Fan Li, Liwen Cheng, Liang Zhao, Xiaofeng Li, Chinhua Wang
Summary: This paper presents the preparation and performance of an ultra-broadband metasurface perfect absorber based on TiN nanostructures, demonstrating a method to achieve high absorption in the UV to NIR region and simulating a TiN-TiO2 hot-electron photoelectric conversion system. This novel material holds promise for playing an important role in efficient hot-electron optoelectronic and photocatalytic systems.
Article
Physics, Multidisciplinary
Yu Bai, Zhen-Fang Zhang, Hai-Bin Yang, Li Cai, Dian-Long Yu
Summary: This study proposes a gradually changing size sound absorbing metasurface based on the dual port asymmetric sound absorber principle to tackle the problem of low frequency engine noise. Theoretical and simulation models are established to analyze the noise reduction mechanism and influencing factors. An acoustic metasurface acoustic liner is designed and analyzed using three methods. The research demonstrates that the designed acoustic liner can achieve a noise reduction effect of over 3 dB in a frequency band range of 252 to 692 Hz.
ACTA PHYSICA SINICA
(2023)
Article
Optics
Qianwei Zhou, Mingze Liu, Wenqi Zhu, Lu Chen, Yongze Ren, Henri J. Lezec, Yanqing Lu, Amit Agrawal, Ting Xu
Summary: By utilizing a single-layer dielectric metasurface, the broadband generation of PVBs across the entire visible spectrum is demonstrated, with their perfect characteristics verified through rigorous optimization of structural parameters. Additionally, it is shown that the ellipticity and diameter of a PVB can be controlled by adjusting the structural parameters of the metasurface, increasing the design flexibility.
LASER & PHOTONICS REVIEWS
(2021)
Article
Nanoscience & Nanotechnology
Jiayi Jiang, Yan Cao, Xin Zhou, Haixia Xu, Kexin Ning, Xuan Xiao, Yanxin Lu, Cairong Ding, Yihang Chen, Jianwen Dong
Summary: In this study, a metasurface broadband perfect absorber with an ultrathin thickness of 148 nm and a large area of around 10 cm(2) was experimentally demonstrated. The absorption efficiency of this absorber exceeded 97% in the wavelength range of 400 to 800 nm. The broadband absorption was attributed to the overlapped resonances of Fabry-Perot, surface plasmon polariton, and localized surface plasmons. These findings provide a novel technique for the manufacturing of absorption-based devices at wafer-scale and low cost for applications such as high-contrast imaging and optical modulation.
Article
Instruments & Instrumentation
Kemeng Gong, Xin Zhou, Jiliang Mo
Summary: In this study, a continuously tunable acoustic metasurface is designed and fabricated to produce transmitted acoustic vortices with multiple orders. The proposed metasurface shows promising applications in real-time acoustic rotational manipulations such as acoustic microfluidics, cell manipulation, acoustic tweezers, and acoustic communication.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Physics, Applied
Hongxing Liu, Jiu Hui Wu, Fuyin Ma
Summary: An acoustic metasurface was proposed to achieve continuously tunable sound absorption at sub-wavelength thickness by introducing a rotatable plate into a variable-diameter semi-cylindrical cavity. This method enabled perfect impedance matching between structure and air within a frequency range of 300-1500 Hz.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
