Zhe Li, Da Teng, Lihua Bai, Qing Cao. Approximate Formula for Effective Refractive Index of TE1 Mode in Terahertz Parallel-Plate Metal Waveguides[J]. Laser & Optoelectronics Progress, 2020, 57(19): 192302
- Laser & Optoelectronics Progress
- Vol. 57, Issue 19, 192302 (2020)
Fig. 1. Schematic of metal PPWG structure
Fig. 2. Normalized tangential electric field distribution of TE1 mode in metal PPWG. (a)(d) Normalized mode field distribution obtained by simulation; (b)(e) electric field distribution in air and metal; (c)(f) electric field distribution in metal
Fig. 3. Comparison of approximate expressions and simulation results. (a) Real part of neff changes with a/λ0; (b) imaginary part of neff changes with a/λ0; (c) real part of neff changes with frequency; (d) imaginary part of neff changes with frequency
Fig. 4. Relative error of approximate expression. (a) Relative error changes with frequency; (b) relative error changes with a/λ0
Fig. 5. Variation of group velocity dispersion and real part of effective refractive index with frequency and partial enlarged view of TE1 mode
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Table 1. Calculation results of different metals
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