Abstract
We present here the first theoretical demonstration of enhanced transmission (up to 90%) through annular aperture arrays engraved into opaque metallic plates thanks to the excitation of the TEM guided mode inside each coaxial cavity. The generation of this peculiar mode is obtained, first, by illuminating the structure under oblique incidence and, second, by considering a TM polarization. Analytical demonstration is performed to confirm the involvement of these two conditions for the emergence of this guided mode. The originality of this configuration comes, first, from the fact that the TEM mode has no cut-off wavelength and, second, from the fact that the transmission peak position is independent of the angle of incidence.
Highlights
We present here the first theoretical demonstration of enhanced transmission through annular aperture arrays engraved into opaque metallic plates thanks to the excitation of the TEM guided mode inside each coaxial cavity
This paper deals with the study of a frequency-selective surfaces (FSSs) structure based on periodically arranged subwavelength coaxial apertures engraved into metallic layers
The first idea that brought Baida and Van Labeke [4] to propose this kind of structure to enhance the light transmission is linked to the fact that a coaxial waveguide made in a perfect conductor has a guided mode without cut-off, i.e. the TEM mode
Summary
We present here the first theoretical demonstration of enhanced transmission (up to 90%) through annular aperture arrays engraved into opaque metallic plates thanks to the excitation of the TEM guided mode inside each coaxial cavity. We will demonstrate the possible generation and the propagation of this TEM mode inside each annular aperture when illuminating the whole structure by a linearly polarized incident plane wave under oblique incidence. For a perfect metallic coaxial waveguide, the TEM mode is completely determined by only two components of the EM field, i.e. Er and Hφ.
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