The modal properties of a double layer, metal-dielectric line-wave waveguide are studied in a wide frequency range, both inside and outside the homogenization limit. Utilizing a sampling-and-fitting approach on the aperture plane, the generally complex longitudinal propagation constant is reconstructed in amplitude and phase. It is observed that, when raising the frequency above a certain threshold, because of intrinsic granularity of the device due to the periodic arrangement of unit cells, the dominant mode evolves to the form of a Bloch wave, which represents the solution of the wave equation in a periodic medium. The modal dispersion of the line wave is then compared to those pertaining to surface waves supported by the substrates, with a slow-wave, plasmonic propagation observed from 10 to 50 GHz.
Madji, M., Baccarelli, P., Monti, A., Toscano, A., Bilotti, F., Burghignoli, P. (2025). Modal Analysis of a Center-Symmetric Line Waveguide. In NTERNATIONAL CONFERENCE ON ELECTROMAGNETICS IN ADVANCED APPLICATIONS (pp.676-679). Institute of Electrical and Electronics Engineers Inc. [10.1109/ICEAA65662.2025.11305832].
Modal Analysis of a Center-Symmetric Line Waveguide
Baccarelli P.;Monti A.;Toscano A.;Bilotti F.;
2025-01-01
Abstract
The modal properties of a double layer, metal-dielectric line-wave waveguide are studied in a wide frequency range, both inside and outside the homogenization limit. Utilizing a sampling-and-fitting approach on the aperture plane, the generally complex longitudinal propagation constant is reconstructed in amplitude and phase. It is observed that, when raising the frequency above a certain threshold, because of intrinsic granularity of the device due to the periodic arrangement of unit cells, the dominant mode evolves to the form of a Bloch wave, which represents the solution of the wave equation in a periodic medium. The modal dispersion of the line wave is then compared to those pertaining to surface waves supported by the substrates, with a slow-wave, plasmonic propagation observed from 10 to 50 GHz.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
