TY  - JOUR
AU  - Coves, A.
AU  - Maestre, H.
AU  - Archiles, R.
AU  - Andres, M. V.
AU  - Gimeno, B.
PY  - 2022
DA  - 2022//
TI  - Surface-Impedance Formulation for Hollow-Core Waveguides Based on Subwavelength Gratings
T2  - IEEE Access
JO  - IEEE Access
SP  - 18843
EP  - 18854
VL  - 10
PB  - Ieee-Inst Electrical Electronics Engineers Inc
KW  - Electromagnetic waveguides
KW  - Optical waveguides
KW  - Planar waveguides
KW  - Gratings
KW  - Surface waves
KW  - Surface impedance
KW  - Optical surface waves
KW  - hollow-core waveguide
KW  - 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.
SN  - 2169-3536
UR  - https://doi.org/10.1109/ACCESS.2022.3151163
DO  - 10.1109/ACCESS.2022.3151163
LA  - English
N1  - WOS:000760714900001
ID  - Coves_etal2022
ER  -