Nan Zhao

Guangdong Polytechnic Normal University

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Jiaming Li

University of Science and Technology of China

Jinyan Li

Huazhong University of Science and Technology

Qingmao Zhang

South China Normal University

Xiangyou Li

Huazhong University of Science and Technology

Guiyao Zhou

South China Normal University

Yongfeng Lu

University of Nebraska–Lincoln

Nengli Dai

Huazhong University of Science and Technology

Lüyun Yang

Huazhong University of Science and Technology

Zhiyun Hou

South China Normal University

Jinggang Peng

Huazhong University of Science and Technology

Cooperative Institutions

Huazhong University of Science and Technology

Chinese Academy of Sciences

Wuhan National Laboratory for Optoelectronics

South China Normal University

Beijing Institute of Technology

University of Chinese Academy of Sciences

Peking University

University of Electronic Science and Technology of China

Hebei University of Technology

Xi'an University of Architecture and Technology

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Planar Luneburg Lens Based on the High Impedance Surface for Effective Ku-Band Wave Focusing

IEEE Access (2018)

Gong Cheng Yu-Ming Wu Jun-Xiang Yin Nan Zhao Tian Qiang

In this paper, a planar Ku-band Luneburg lens is designed, fabricated, and measured. Based on the high impedance surface, metamaterial units are designed and arranged in an array with gradient equivalent refractive index to achieve good wave focusing effects in the Ku band. The proposed 2-D lens is superior at its compact size and more feasible fabrication process when compared with the conventional 3-D lens. Both theoretical analysis and measurement results have been provided for a systematic study on this lens’ performance, and good agreement between them has been achieved. Benefiting from flexible beam steering, the proposed lens has helpful applications in estimating the direction of arrival in the passive direction finding system, improving the directive radiation for an antenna, and simulating increased target’s radar cross-section characteristic by adding a reflector.

Luneburg lens

Beam steering

Reflector (photography)

10.1109/access.2018.2805805

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Citations (15)

Thermal modeling and cooling analysis of high-power lithium ion cells

Journal of Thermal Science (2011)

Zhuqian Zhang Li Jia Nan Zhao Xin Yang

Heat Generation

10.1007/s11630-011-0512-3

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Citations (33)

Robust Q-switching based on stimulated Brillouin scattering assisted by Fabry-Perot interference

Optics Express (2019)

Shaodong Hou Yang Lou Nan Zhao Ping Chen Fangfang Zhang

Q-switching operation based on stimulated Brillouin scattering (SBS) has been developed for decades due to its inexpensive configuration, high pulse energy output, and the potential to be free from wavelength and material limitations. However, unstable and uncontrollable pulse output affected by SBS's stochastic nature hinders its development. In this work, we demonstrated a unique robust SBS-based Q-switched all-fiber laser. Firstly, a numerical model is developed and a general analysis about the robust Q-switching mechanism is presented. Simulation results show that the spectrum modulation effect such as FP interference is efficient for system to realize steady and controllable output. Secondly, we incorporated a Fabry-Perot (FP) interferometer made of two un-contact end faces of fiber connectors into a SBS-based Q-switched system and demonstrated passively robust Q-switching with simpler and cheaper configuration than most reported ones. Under 600 mW pump power, the SNR was measured to be as high as 62.96 dB, which is the highest SNR obtained from SBS-based Q-switched lasers. To our best knowledge, this is the first demonstration of robust SBS-based Q-switching without any external measures.

Q-switching

Switching time

Modulation (music)

10.1364/oe.27.005745

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Citations (9)

FeS2-doped MoS2 nanoflower with the dominant 1T-MoS2 phase for Enhanced Peroxidase Activity

Solid State Sciences (2025)

Jianjiao Xin Yan Jiang Kun Song Nan Zhao Zhuanfang Zhang

Nanoflower

10.1016/j.solidstatesciences.2025.107867

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Effect of the Interlayer Phase Angle on the Characteristics of Ti-6al-4v Fabricated by Laser Powder Bed Fusion

Duosheng Li Qingxiao Feng Yin Ye Wugui Jiang Nan Zhao

Laser powder bed fusion (LPBF) is a potential additive manufacture technology due to its high forming efficiency and precision. This paper focuses on the influence of the interlayer phase angle (laser printing scanning strategy) on the characteristics of Ti-6Al-4V. A three-dimensional finite element model was established to explore the effect of different interlayer phase angles on the thermal stress evolution and residual stress of Ti-6Al-4V. At the same time, the effect of the interlayer phase angle on the porosity, microstructure and mechanical properties of Ti-6Al-4V was also studied. The results show that when the phase angle increases from 0° to 135° and then to subarea-135° (S-135°), the residual stress gradually decreases and presents a stable trend. The printed Ti-6Al-4V is composed of needle-shaped α' martensite in the growth direction of ±45° with the β grain boundary. The phase angle increases, which makes the temperature distribution more uniform during the thermal cycle, and the columnar crystal size also raises. After the partition strategy, the mechanical properties of Ti-6Al-4V are significantly improved. The study provides a valuable guidance for optimizing the scanning strategy of laser powder bed fusion.

10.2139/ssrn.4443100

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Stability Improvement of Nuclear Magnetic Resonance Gyroscope with Self-Calibrating Parametric Magnetometer

arXiv (Cornell University) (2023)

Guoping Gao Jinbo Hu Feng Tang Wenhui Liu Xiangdong Zhang

In this paper, we study the stability of nuclear magnetic resonance gyroscope (NMRG), which employs Xe nuclear spins to measure inertial rotation rate. The Xe spin polarization is sensed by an in-situ Rb-magnetometer. The Rb-magnetometer works in a parametric oscillation mode (henceforth referred to as the Rb parametric magnetometer, or Rb-PM), in which the Larmor frequency of the Rb spins is modulated and the transverse components of Xe nuclear spin polarization are measured. As the measurement output of the Rb-PM, the phase of the Xe nuclear spin precession is eventually converted to the Xe nuclear magnetic resonance (NMR) frequencies and the inertial rotation rate. Here we provide a comprehensive study of the NMR phase measured by the Rb-PM, and analyze the influence of various control parameters, including the DC magnetic field, the frequency and phase of the modulation field, and the Rb resonance linewidth, on the stability of the NMR phase. Based on these analysis, we propose and implement a self-calibrating method to compensate the NMR phase drift during the Rb-PM measurement. With the self-calibrating Rb-PM, we demonstrate a significant improvement of the bias stability of NMRG.

Larmor precession

Free induction decay

Laser linewidth

10.48550/arxiv.2305.15847

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WITHDRAWN: Research about the structure of Trichromatic LED Backlight

Optik (2009)

Jun Chang Zhihui Sun Muhammad Talha Yongtian Wang Nan Zhao

Backlight

Trichromacy

10.1016/j.ijleo.2009.02.018

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Uncertainty Analysis and Maneuver Simulation of Standard Ship Model

Journal of Marine Science and Engineering (2024)

Hui Li Nan Zhao Jian Zhou Xiang‐Yu Chen Chenxu Wang

Maneuver simulation of a standard ship model gives indication of numerical accuracy. In the numerical calculation of ship maneuvering, uncertainty analysis is a necessary step to ensure the accuracy of the calculation. In this study, uncertainty pair analysis is carried out in the simulation of the turning circle motion of the standard ship model ONRT in waves. According to the uncertainty analysis procedure recommended by the International Towing Tank Conference (ITTC), the change of ship resistance caused by the number of grids is studied to determine the influence of grid density on the numerical prediction. The simulation of turning motion in waves is carried out based on the uncertainty analysis. It is found that the minimum number of overset grids for this simulation is 1.4 million. The numerical results are fairly accurate compared to experimental results, and this technique provides a method with low calculated cost for this simulation.

Towing

Response amplitude operator

Ship motions

10.3390/jmse12071230

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Citations (1)

Experimental demonstration of optical fiber laser with octagonal-shaped core

Applied Physics A (2015)

Yibo Wang Lei Liao Nan Zhao Jinggang Peng Nengli Dai

Cladding (metalworking)

Double-clad fiber

Slope efficiency

All-silica fiber

Plastic-clad silica fiber

10.1007/s00339-015-9032-4

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Citations (1)

Accuracy Improvement For Minor Elements Determination Using Modified Self-Absorption Correction And One-Point Calibration Laser-Induced Breakdown Spectroscopy

Atomic Spectroscopy (2024)

Nan Zhao

Determination of minor elements is the weakness of one-point calibration laser-induced breakdown spectroscopy (OPC-LIBS), which greatly hinders the further development of OPC-LIBS.The normalization in minor elements determination is seriously influenced by self-absorption effect of matrix element in laser-induced plasma.In this work, a modified self-absorption correction method was proposed in OPC-LIBS.The plasma temperature was determined by the slope of Saha-Boltzmann plots established for minor elements, and the electron number density was calculated from the Hα line.The internal reference line of the matrix element was corrected and iterated, until the maximum value of the self-absorption coefficient in the analytical line of minor elements was less than 1.The correction factors were determined based on elemental concentration in the reference sample and Boltzmann plots, and then were used in other samples for elemental determination.Twelve certified 6061 reference aluminum alloy samples and seven micro-alloy steel samples were used as examples for demonstration.Compared with both conventional OPC-LIBS and IRSAC & OPC, the dist in the proposed method (modified IRSAC & OPC) was reduced to 0.537-1.632wt.% and 0.891-2.805wt.% for the aluminum alloy and micro-alloy steel, respectively.These results showed that the proposed method can improve the accuracy of detecting minor elements using only one reference sample, which greatly facilitates the application of LIBS.

Laser-induced breakdown spectroscopy

Minor (academic)

10.46770/as.2023.314

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