激光与光电子学进展, 2019, 56 (19): 192302, 网络出版: 2019-10-14
余弦-高斯光束在太赫兹平行平板波导中的传输研究 下载: 1044次
Cos-Gaussian Beams Propagating Inside Terahertz Parallel-Plate Waveguides
光学器件 平行平板波导 太赫兹波 金属光学 余弦-高斯光束 optical devices parallel-plate waveguide terahertz wave metal optics cos-Gaussian beam
摘要
基于平行平板波导的TE1模式理论和电场是近似线偏振的假设,推导了余弦-高斯光束在平行平板波导中的电场传输表达式。在傍轴近似的条件下,余弦-高斯光束可以作为平行平板波导的一个基础解。当频率为0.35 THz时,对余弦-高斯光束在金属铜平行平板波导中的传输进行了数值模拟,结果表明模拟的幅值和相位与根据电场表达式所得结果符合得很好,同时也讨论了z轴方向上模拟的相位与理论结果的偏差和电场散度方程的完备性。
Abstract
Herein, based on the TE1 mode theory of the parallel-plate waveguide and assumption of approximately linearly polarized electric fields, we derive the expression of electric-field propagation of a cos-Gaussian beam in the parallel-plate waveguide. Under the paraxial approximation, the cos-Gaussian beam can be used as a fundamental solution for parallel-plate waveguides. The derived beam is tested by numerical simulation in copper parallel-plate waveguides at a frequency of 0.35 THz. Results show that the simulated amplitude and phase are in good agreement with those from the analytical expression of electric field. The deviation between the simulated phase and theoretical results at the z-axis and completeness of the electric-field divergence equation are also discussed.
吴登明, 滕达, 曹清, 白丽华, 李哲. 余弦-高斯光束在太赫兹平行平板波导中的传输研究[J]. 激光与光电子学进展, 2019, 56(19): 192302. Dengming Wu, Da Teng, Qing Cao, Lihua Bai, Zhe Li. Cos-Gaussian Beams Propagating Inside Terahertz Parallel-Plate Waveguides[J]. Laser & Optoelectronics Progress, 2019, 56(19): 192302.