Abstract
Resonant transmission of microwaves through a subwavelength slit in a thick metal plate, into which subwavelength cuts have been made, is explored. Two orientations of the cuts, parallel and perpendicular to the long axis of the slit, are examined. The results show that the slits act as though filled with a medium with anisotropic effective relative permeability which at low mode numbers has the two values ∼(1, 9.1), increasing to ∼(1, 14.4) for higher mode numbers.
Highlights
We explore the effect of making cuts into the metal, both parallel and perpendicular to the long axis of the slit, arranged in a subwavelength pitch array
Numerical values are presented for the relative permeability at various plate separations, and a maximum experimental value of μ = 14.4 (n = 3.8) is found for a plate separation of 50 μm for high order resonant modes
Simple Fabry–Perot theory for the resonant frequencies fFP of a cavity formed by a slit in a metal plate of thickness, d, filled with a dielectric of refractive index n, gives fFP
Summary
We explore the effect of making cuts into the metal, both parallel and perpendicular to the long axis of the slit, arranged in a subwavelength pitch array. In sample (b), figure 1(b), cuts are made into the metal parallel to the long axis of the slit.
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