PT Journal
AU Coves, A
   Maestre, H
   Archiles, R
   Andres, MV
   Gimeno, B
TI Surface-Impedance Formulation for Hollow-Core Waveguides Based on Subwavelength Gratings
SO IEEE Access
JI IEEE Access
PY 2022
BP 18843
EP 18854
VL 10
DI 10.1109/ACCESS.2022.3151163
LA English
DE Electromagnetic waveguides; Optical waveguides; Planar waveguides; Gratings; Surface waves; Surface impedance; Optical surface waves; hollow-core waveguide; surface-relief grating
AB A rigorous Surface Impedance (SI) formulation for planar waveguides is presented. This modal technique splits the modal analysis of the waveguide in two steps. First, we obtain the modes characteristic equations as a function of the SI and, second, we need to obtain the surface impedance values using either analytical or numerical methods. We validate the technique by comparison with well-known analytical cases: the parallel-plate waveguide with losses and the dielectric slab waveguide. Then, we analyze an optical hollow-core waveguide defined by two high-contrast subwavelength gratings validating our results by comparison with reported values. Finally, we show the potential of our formulation with the analysis of a THz hollow-core waveguide defined by two surface-relief subwavelength gratings, including material losses in our formulation.
ER