Dr. Zhenhai Wu Profile

Dr. Zhenhai Wu

at Southwest Petroleum University

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Publications (4)

Proceedings Article | 12 March 2021 Paper

A photonic beamformer based on integrated optical delay line

Yongchuan Xiao, Jingxian Liu, Tao Zhou, Xin Zhong, Minhui Long, Pengfei Qu, Zhiyu Chen, Jianxiao Leng, Zhenhai Wu

Proceedings Volume 11763, 117637V (2021) https://doi.org/10.1117/12.2587489

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SPIE Journal Paper | 3 November 2014 Open Access

Super-resolution photoacoustic microscopy using photonic nanojets: a simulation study

Paul Kumar Upputuri, Zhuo-Bin Wen, Zhenya Wu, Manojit Pramanik

JBO, Vol. 19, Issue 11, 116003, (November 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.11.116003

KEYWORDS: Photonic nanostructures, Super resolution, Photoacoustic microscopy, Image resolution, Photonic microstructures, Sensors, Water, Biomedical optics, Tissue optics, Transducers

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Optical resolution photoacoustic microscopy (ORPAM) is important for various biomedical applications, such as the study of cellular structures, microcirculation systems, and tumor angiogenesis. However, the lateral resolution of a conventional ORPAM is limited by optical diffraction. In this work, we report a simulation study to achieve subdiffraction-limited super-resolution in ORPAM using microspheres. Laser radiation is focused through a microsphere to generate a photonic nanojet, which provides the possibility to break the diffraction limit in ORPAM by reducing the size of the excitation volume. In our simulations using microspheres, we observed improvement in the lateral resolution up to ∼fourfold compared to conventional ORPAM. The method is simple, cost effective, and can provide far-field resolution. This approach may provide new opportunities for many biomedical imaging applications that require finer resolution.

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Proceedings Article | 14 March 2013

Research on the net amount of air traffic network

Jun Hu, Zhenya Wu

Proceedings Volume 8768, 87683W (2013) https://doi.org/10.1117/12.2011104

KEYWORDS: Picosecond phenomena, Mechanics, Computer programming, Computer science, Information science, Information technology, Fluid dynamics, Computational fluid dynamics, Motion analysis, Computer simulations

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As accurate prediction of traffic flow states could reduce the congestion possibility, the theoretical study of air traffic was how to determinate the next time the state with fluid mechanics based on random condition. Then, a novel depicting method of air traffic flow is proposed, which calculated the change of net amount in flow conservation equation with discrete time loss queuing, further, it could determine the relationship between flow and density. Compared to the existing general algorithm, the threshold of net amount was presented in the method, and it had good adaptability.

SPIE Journal Paper | 1 November 2011

Bends and splitters for self-collimated beams in two-dimensional triangular lattice photonic crystals

Zhenhai Wu, Kang Xie, Huajun Yang, Ping Jiang

OE, Vol. 50, Issue 11, 114002, (November 2011) https://doi.org/10.1117/12.10.1117/1.3651796

KEYWORDS: Beam splitters, Photonic crystals, Finite-difference time-domain method, Photonic integrated circuits, Light wave propagation, Waveguides, Dispersion, Scattering, Integrated circuit design, Structural design

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By introducing a line defect and a V-shaped defect into two-dimensional triangular lattice photonic crystals, a 60 deg beam bend, a Y-shaped beam slitter, and a one-to-three beam splitter are designed based on the self-collimation effect of photonic crystals (PCs). By analyzing the equi-frequency contours calculated with the plane wave expansion method, the frequency for self-collimation in the PC is determined. By using the finite-difference time-domain method, the beam bending efficiency and splitting ratios of the device as a function of the defect radius are calculated. These results are confirmed by computational simulations that provide field distributions of light propagating in the structures. The designed beam bend and splitters offer more choices for beam control in the design of photonic integrated circuits.

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