Excitation and coupling of volume and surface fields on complex electrodynamic surfaces at Mm-wave and THz frequencies

MacLachlan, A. J. and Robertson, C. W. and Cross, A. W. and Ronald, K. and Phelps, A. D. R. (2020) Excitation and coupling of volume and surface fields on complex electrodynamic surfaces at Mm-wave and THz frequencies. IET Microwaves, Antennas & Propagation. ISSN 1751-8725 (In Press)

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    Abstract

    Analytical theory describing the resonant excitation and coupling of volume and surface fields on the surface of two dimensional complex electrodynamic structures is presented. The theoretical analysis is valid over a broad frequency spectrum from mm-wave frequencies through THz and even optical frequencies. An experimental study of planar periodic structures has been carried out using a Vector Network Analyzer calibrated to operate in the 140-220 GHz frequency range. Experimental results compare resonant eigenmode formation in two periodic surface lattice structures designed to operate within the 140 GHz -220 GHz frequency band; one periodic surface lattice etched onto a metal-backed substrate and the other arranged to have an equivalent air separation. Dispersion diagrams derived from the analytical theory are presented. The results and theory are fundamental to some of the routes to the innovation of high power, mm-wave and THz sources, solar cells and novel subwavelength absorbers.