【摘 要】
：
A systematic study of the aperture efficiency and mode constituent for orbital angular momentum (OAM) vortex beam generated by digital metasurface is presented.
【机 构】
：
Air Force Engineering University, Xi’an 710077, China
论文部分内容阅读
A systematic study of the aperture efficiency and mode constituent for orbital angular momentum (OAM) vortex beam generated by digital metasurface is presented.The aperture efficiency and OAM spectrum are computed for different bit numbers.It is found that the aperture efficiency declines for digital metasurface due to the phase quantization error,especially for 1-bit device.Fortunately,the OAM spectrum is barely affected by phase quantization and the designated main mode keeps dominant for different bit numbers,indicating that high purity OAM vortex beam can be generated by digital metasurface.Besides,the influence of topological charge l is also investigated.For a fixed metasurface,the radiation performance deteriorates sharply with the growing of l and the parasitic OAM mode becomes dominant at certain angle.At last,a prototype of 1-bit metasurface was simulated,fabricated and measured in anechoic chamber.The simulation and experiment results verify the correctness of the numerical analysis.
其他文献
Elastic properties are important in fundamental understanding of multiferroic materials. However, up to now, there is no work about anisotropy of elastic proper
The ionized dopants, working as quantum dots in silicon nanowires, exhibit potential advantages for the development of atomic-scale transistors. We investigate
如何研究新教材,按照高中学生的个性特点和认知结构,设计出指导学生高效学习的有效方法,以便使学生尽快适应新教材,培养其自主、合作、探究和创新的能力,充分体现新课程标准
本文用“因声求气吟咏诗韵”的方法,赏读了李白的,学习了“吟诵”这一中华文化的绝学,希望大家在今后的学习生活中,多多朗读诗歌美文,把这一绝学发扬光大.
数学思维方法是对数学内容的思维运动形式的认识.学习数学思维,就是学习数学思维运动形式.因此,数学的思维方法就成为学生数学学习的重要方面,同时,学生数学思维方法的掌握,
We theoretically investigated the properties of the high-order harmonic generation from an argon atom by bichromatic counter-rotating circularly polarized (BCCP
本文以新疆和田“皮雅曼”石榴叶和加工废弃物石榴皮、石榴籽为试验材料,对石榴黄酮类化合物进行了定性定量试验,结果表明总黄酮的含量在石榴皮中比其它部位含量高;在此基础
ZnO/graphene/polyaniline (PANI) composite is synthesized and used for photoelectrocatalytic oxidation of methane under simulated sun light illumination with amb
在课堂教学过程中,只要充分尊重和发挥学生的主体作用,让他们在课堂教学的每一个环节上愉快地动脑、动口、动手,让他们主动地去求知、去发现,就会成为学习的主人,不断提高学
Multiple phase transitions are detected in sodium amide (NaNH2),an important hydrogen storage material,upon compression in diamond anvil cells (DAC) by using Ra