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A broadband terahertz quarter wave plate based on asymmetric cross slots

Optoelectronics Letters 2019年第5期15卷 352-355页

作者： PAN Wu REN Xin-yu CHEN Qi WANG Xue-yin College of Photoelectronic Engineering Chongqing University of Posts and Telecommunications

In this paper, a transmissive terahertz(THz) quarter wave plate(QWP) has been proposed to realize the linear-to-circular polarization conversion in terahertz range. This quarter wave plate is composed of two dielectric layers and one metallic layer with asymmetric cross slots. In the range of 0.894-1.378 THz, the axis ratio of proposed device is less than 3 d B, and its polarization conversion efficiency is more than 45%. The distributions of surface currents and electromagnetic field density had been proposed to understand the physical mechanism of proposed device. The linear-to-circular polarization conversion can be attributed to the asymmetric transmission along slots. Finally, the simulation results are validated by experiments in terahertz region. The proposed device has simple geometry and good performance, which can be used as a key component in applications of terahertz communications, terahertz imaging and terahertz sensing.

关键词： transmissive terahertz(THz) quarter wave plate(QWP) asymmetric cross slots

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Alloy Gene Sequence Project and System Science Philosophy

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International Journal of Communications, Network and System Sciences 2017年第12期10卷 327-401页

作者： Youqing Xie Xiaobo Li Xinbi Liu Hongjian Peng Yaozhuang Nie School of Materials Science and Engineering Central South University Changsha China Powder Metallurgy Research Institute Central South University Changsha China State Key Laboratory of Powder Metallurgy Central South University Changsha China School of Materials Science and Engineering Xiangtan University Xiangtan China School of Chemistry and Chemical Engineering Central South University Changsha China School of Physical Science and Technique Central South University Changsha China

System Science Philosophy is a knowledge system constructed of universal principle and law sequences. Alloy gene is a characteristic atom existing in the center of coordination cluster and occupying the lattice point of a lattice cell, and carries holographic information about valence electron structure, physical and thermodynamic properties obtained by alloy gene theory. Alloy gene potential energy curve function has developed traditional atom pair interaction potential functions into many atoms’ interaction function associated with valence electron structure, bond length, bond energy, which makes alloy gene Gibbs energy function can be established. Alloy gene Gibbs energy transmissive function has developed traditional partition function. Its equilibrium and sub-equilibrium transmissive modes produce alloy holographic network positioning bank, which is operable platform to achieve transformation from “trial and error” method to the “whole obtained from a few part” law for getting advanced alloys. It has become possible to launch alloy gene sequence project.

关键词： Alloy Gene Sequence System Science Philosophy Alloy Gene Theory Alloy Gene Gibbs Energy transmissive Function Alloy Holographic Network Positioning Bank

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