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Chinese Physics B

Resumen/Descripción – provisto por la editorial en inglés
Chinese Physics B covers the latest developments and achievements in all branches of physics. Articles, including papers and rapid communications, are those approved as creative contributions to the whole discipline of physics and of significance to their own fields.
Palabras clave – provistas por la editorial

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Historia

Continúa: Chinese Physics

Disponibilidad
Institución detectada Período Navegá Descargá Solicitá
No detectada desde ene. 2008 / hasta dic. 2023 IOPScience

Información

Tipo de recurso:

revistas

ISSN impreso

1674-1056

Editor responsable

Chinese Physical Society (CPS)

País de edición

China

Fecha de publicación

Cobertura temática

Tabla de contenidos

Near-field multiple super-resolution imaging from Mikaelian lens to generalized Maxwell’s fish-eye lens

Yangyang Zhou; Huanyang Chen

<jats:title>Abstract</jats:title> <jats:p>Super-resolution imaging is vital for optical applications, such as high capacity information transmission, real-time bio-molecular imaging and nanolithography. In recent years, technologies and methods of super-resolution imaging have attracted much attention. Different kinds of novel lenses, from the superlens to the super-oscillatory lens, have been designed and fabricated to break through the diffraction limit. However, the effect of the super-resolution imaging in these lenses is not satisfactory due to intrinsic loss, aberration, large sidebands and so on. Moreover, these lenses also cannot realize multiple super-resolution imaging. In this research, we introduce the solid immersion mechanism to Mikaelian lens (ML) for multiple super-resolution imaging. The effect is robust and valid for broadband frequencies. Based on conformal transformation optics as a bridge linking the solid immersion ML and generalized Maxwell’s fish-eye lens (GMFEL), we also discover the effect of multiple super-resolution imaging in the solid immersion GMFEL.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. No disponible

Formation of quaternary all-d-metal Heusler alloy by Co doping fcc type Ni2MnV and mechanical grinding induced B2-fcc transformation

Lu Peng; Qiangqiang Zhang; Na Wang; Zhonghao Xia; Yajiu Zhang; Zhigang Wu; Enke Liu; Zhuhong Liu

<jats:title>Abstract</jats:title> <jats:p>The structure of the all-<jats:italic>d</jats:italic>-metal alloy Ni<jats:sub>50-<jats:italic>x</jats:italic> </jats:sub>Co<jats:sub> <jats:italic>x</jats:italic> </jats:sub>Mn<jats:sub>25</jats:sub>V<jats:sub>25</jats:sub> (<jats:italic>x</jats:italic> = 0-50) was investigated by theoretical and experimental methods. The first-principles calculations indicate that the most stable structure of Ni<jats:sub>2</jats:sub>MnV alloy is face-centered cubic (<jats:italic>fcc</jats:italic>) type structure with ferrimagnetic state and the equilibrium lattice constant is 3.60 Å, which is in agreement with the experimental result. It is remarkable that replacing partial Ni with Co can turn the alloy from <jats:italic>fcc</jats:italic> structure to B2-type Heusler structure as Co content <jats:italic>x</jats:italic> &gt; 37 by using melting spinning method, implying that the <jats:italic>d</jats:italic>-<jats:italic>d</jats:italic> hybridization between Co/Mn elements and low-valent elements V stabilizes the Heusler structure. The Curie temperature <jats:italic>T</jats:italic> <jats:sub> <jats:italic>C</jats:italic> </jats:sub> of all-<jats:italic>d</jats:italic>-metal Heuser alloy Ni<jats:sub>50-<jats:italic>x</jats:italic> </jats:sub>Co<jats:sub> <jats:italic>x</jats:italic> </jats:sub>Mn<jats:sub>25</jats:sub>V<jats:sub>25</jats:sub> (<jats:italic>x</jats:italic> &gt; 37) increases almost linearly with the increase of Co due to that the interaction of Co-Mn is stronger than Ni-Mn. A magnetic transition from ferromagnetic state to weak magnetic state accompanying with grinding stress induced transformation from B2 to the dual-phase of B2 and <jats:italic>fcc</jats:italic> has been observed in these all-<jats:italic>d</jats:italic>-metal Heusler alloys. This phase transformation and magnetic change provide a guide to overcome the brittleness and make the all-<jats:italic>d</jats:italic>-metal Heusler alloy interesting in stress and magnetic driving structural transition.</jats:p>

Palabras clave: General Physics and Astronomy.

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Memristor hyperchaos in a generalized Kolmogorov-type system with extreme multistability

Xiaodong Jiao; Mingfeng Yuan; Jin Tao; Hao Sun; Qinglin Sun; Zengqiang Chen

<jats:title>Abstract</jats:title> <jats:p>Memristor chaotic systems have aroused great attention in recent years with their potentials expected in engineering applications. In this paper, a five-dimension (5D) double-memristor hyperchaotic system (DMHS) is modeled by introducing two active magnetron memristor models into the Kolmogorov-type formula. The boundness condition of the proposed hyperchaotic system is proved. Coexisting bifurcation diagram and numerical verification explain the bistability. The rich dynamics of the system are demonstrated by the dynamic evolution map and the basin. The simulation results reveal the existence of transient hyperchaos and hidden extreme multistability in the presented DMHS. The NIST tests show the generated signal sequence is highly random which is feasible for encryption purposes. Furthermore, the system is implemented based on a FPGA experimental platform, which benefits the further applications of the proposed hyperchaos.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. No disponible

Spatially modulated scene illumination for intensity-compensated 2D array photon-counting LiDAR imaging

Jiaheng Xie; Zijing Zhang; Mingwei Huang; Jiahuan Li; Fan Jia; Yuan Zhao

<jats:title>Abstract</jats:title> <jats:p>Photon-counting LiDAR using a two-dimensional (2D) array detector has the advantages of high lateral resolution and fast acquisition speed. The non-uniform intensity profile of the illumination beam and non-uniform quantum efficiency of the detectors in the 2D array deteriorate the imaging quality. Herein, we propose a photon-counting LiDAR system that uses a spatial light modulator to control the spatial intensity to compensate for both the non-uniform intensity profile of the illumination beam, and the variation in the quantum efficiency of the detectors in the 2D array. Using a 635 nm peak wavelength and 4 mW average power semiconductor laser, lab-based experiments at a 4.27 m stand-off distance were performed to verify the effectiveness of the proposed method. Compared with the unmodulated method, the standard deviation of the intensity image of the proposed method is reduced from 0.109 to 0.089 for a whiteboard target, with an average signal photon number of 0.006 per pixel.</jats:p>

Palabras clave: General Physics and Astronomy.

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The Effects of Mesoscale Eddies on Spatial Coherence of Middle Range Sound Field in Deep Water

Fei Gao; Fang-Hua Xu; Zheng-Lin Li

<jats:title>Abstract</jats:title> <jats:p>The mesoscale eddies have a remarkable influence on the sound field underwater, and many previous studies investigate the effects of eddies on transmission loss (TL), convergence zone, time delay, etc. However, the effects of eddies on spatial coherence are less studied and remain unclear. In this paper, the effects of eddies on spatial coherence at the subsurface in deep water is investigated. The eddy environments are simulated with Gaussian eddy equations, the complex pressure field is obtained using a range dependent parabolic equation (PE) model, and the associated mechanism is analyzed based on ray theories and models. The results show that the cold/warm mesoscale eddies affect the spatial coherence in high intensity zone, by changing the locations and width of the convergence zone. In the shadow zone, the horizontal correlation radius (HCR) and the vertical correlation radius (VCR) increases with range and decreases with depth, and they are increased by warm eddies and decreased by cold eddies, mainly caused by variation of multipath structure.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. No disponible

Ultra-wideband surface plasmonic bandpass filter with extremely wide upper-band rejection

Xue-Wei Zhang; Shao-Bin Liu; Qi-Ming Yu; Ling-Ling Wang; Kun-Liao; Jian Lou

<jats:title>Abstract</jats:title> <jats:p>An ultra-wideband bandpass filter (BPF) with a wide out-of-band rejection based on surface plasmonic waveguide (SPW) slotline with ring grooves is designed and analyzed. A pair microstrip to slotline transition is designed for quasi-TEM to TM mode conversion by using a microstrip line with the circular pad and the slotline with the same circular slot. The mode conversion between the TM and the surface plasmon polaritons (SPP) mode is realized by using gradient slotline with ring grooves and impedance matching technique. The upper cut-off frequencies of the passband can be adjusted by using these proposed SPP units, while the lower frequencies of the passband are created by using the microstrip to slotline transitions, an ultra-wideband BPF is realized. The dispersion curves of SPP units, electric field distribution, and the transmission spectra of the proposed ultra-wideband bandpass filter are all calculated and analyzed by the finite difference time domain (FDTD) method. The simulated results show that the presented filter has good performance including a wide 3-dB bandwidth of 149% from 0.57 GHz to 3.93 GHz, an extremely wide 40-dB upper-band rejection from 4.2 to 18.5 GHz, and low loss and high selectivity in the passband. To prove the design validity, a prototype of the BPF has been manufactured and measured, showing a reasonable agreement with simulation results. The unique feature of the proposed BPF may be applicable for integrated circuit and plasmonic devices in microwave or THz frequency.</jats:p>

Palabras clave: General Physics and Astronomy.

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Bandwidth expansion and pulse shape optimized for 10 PW laser design via spectral shaping

Da-Wei Li; Tao Wang; Xiao-Lei Yin; Li Wang; Jia-Mei Li; Hui Yu; Yong Cui; Tian-Xiong Zhang; Xing-Qiang Lu; Guang Xu

<jats:title>Abstract</jats:title> <jats:p>We demonstrated a scheme of bandwidth expansion and pulse shape optimized to afford 10 PW laser design via spectral shaping, which uses the existing Nd:glass amplifier chain of the SG PW laser. Compared to the amplified pulse with gain-narrowing effect, the required parameters of injected pulse energy, spectral bandwidth, and shape are analyzed, together with their influence on the system <jats:italic>B</jats:italic>-integral, energy output capability, and temporal intensity contrast. A bandwidth expansion to 7 nm by using LiNbO<jats:sub>3</jats:sub> birefringent spectral shaping resulted in an output energy of 2 kJ in a proof-of-principle experiment. The results are consistent with the theoretical prediction which suggests that the amplifier chain of SG PW laser is capable of achieving 6 kJ at the bandwidth of 7 nm and the <jats:italic>B</jats:italic>-integral &lt; π. This will support a 10 PW laser with a compressed pulse energy of 4.8 kJ (efficiency=80%) at 480 fs.</jats:p>

Palabras clave: General Physics and Astronomy.

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X-ray phase-sensitive microscope imaging with a grating interferometer: theory and simulation

Jiecheng Yang; Peiping Zhu; Dong Liang; Hairong Zheng; Yongshuai Ge

<jats:title>Abstract</jats:title> <jats:p>In this work, a general theoretical framework is presented to explain the formation of the phase signal in an X-ray microscope integrated with a grating interferometer, which simultaneously enables the high spatial resolution imaging and the improved image contrast. Using this theory, several key parameters of phase contrast imaging can be predicted, for instance, the fringe visibility and period, the conversion condition from the differential phase imaging (DPI) to the phase difference imaging (PDI). Additionally, numerical simulations are performed with certain X-ray optical components and imaging geometry. Comparison with the available experimental measurement[Appl. Phys. Lett. <jats:bold>113</jats:bold>, 063105 (2018)] demonstrates the accuracy of this developed quantitative analysis method of X-ray phase-sensitive microscope imaging.</jats:p>

Palabras clave: General Physics and Astronomy.

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Dynamic range and linearity improvement for zero-field single-beam atomic magnetometer

Kai-Feng Yin; Ji-Xi Lu; Fei Lu; Bo Li; Bin-Quan Zhou; Mao Ye

<jats:title>Abstract</jats:title> <jats:p>Zero-field single-beam atomic magnetometers with transverse parametric modulation for ultra-weak magnetic field detection have attracted widespread attention recently. In this study, we present a comprehensive response model and propose a modification method of conventional first harmonic response by introducing the second harmonic correction. The proposed modification method gives improvement in dynamic range and reduction of linearity error. Additionally, our modification method shows suppression of response instability caused by optical intensity and frequency fluctuations. An atomic magnetometer with single-beam configuration is built to compare the performance between our proposed method and the conventional method. The results indicate that our method's magnetic field response signal achieves a 5-fold expansion of dynamic range from 2 nT to 10 nT, with the linearity error decreased from 5% to 1%. Under the fluctuations of 5% for optical intensity and ±15 GHz detuning of frequency, the proposed modification method maintains intensity-related instability &lt; 1% and frequency-related instability &lt; 8% while the conventional method suffers 15% and 38% respectively. Our method is promising for future high-sensitive and long-term stable optically pumped atomic sensors.</jats:p>

Palabras clave: General Physics and Astronomy.

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Application of Galerkin spectral method for tearing mode instability

Wu Sun; Jiaqi Wang; Lai Wei; Zhengxiong Wang; Dongjian Liu; Qiaolin He

<jats:title>Abstract</jats:title> <jats:p>Magnetic reconnection and tearing mode instability play a critical role in many physical processes. The application of Galerkin spectral method for tearing mode instability in two-dimensional geometry is investigated in this paper. A resistive magnetohydrodynamic code is developed, by the Galerkin spectral method both in the periodic and aperiodic directions. Spectral schemes are provided for global modes and local modes. Mode structures, resistivity scaling, convergence and stability of tearing modes are discussed. The effectiveness of the code is demonstrated, and the computational results are compared with the results of using Galerkin spectral method only in the periodic direction. The numerical results show that the code using Galerkin spectral method individually allows larger time step in global and local modes simulations, and has better convergence in global modes simulations.</jats:p>

Palabras clave: General Physics and Astronomy.

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