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Low angular-dispersion microwave absorption of a metal dual-period nondiffracting hexagonal grating
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View: Figures


Image of FIG. 1.
FIG. 1.

The unit cell (light region) and coordinate system illustrating the angle of incidence , azimuth angle , and plane of incidence together with the reciprocal lattice vectors. Primitive lattice vectors are omitted for clarity. Also shown is a schematic representation of a single dual-period grating profile.

Image of FIG. 2.
FIG. 2.

-polarized reflectivity data obtained for , clearly showing seven resonances as reflectivity minima. The modeled response of the structure (solid line) is obtained using a FEM modeling code.

Image of FIG. 3.
FIG. 3.

The experimental and modeled dispersion curves of modes 1 through 7 (1 being the lowest-energy mode and 7 being the highest) at . The position in frequency of each mode in the range is plotted against the associated in-plane momentum , where is the resonant frequency and is the speed of light. Also shown is the light line and the (1,0) diffracted light line.

Image of FIG. 4.
FIG. 4.

(a) -polarized and (b) -polarized reflectivity data as a function of both frequency and azimuth angle at a fixed polar angle of 38°. Light regions correspond to strong reflection, while dark regions correspond to absorption.

Image of FIG. 5.
FIG. 5.

Time-averaged electric field magnitude at the resonant frequencies of modes 1 and 2 respectively, modeled over a plane parallel to the surface of the grating, at (where is defined as the uppermost surface of the metallic structure in the plane). Radiation is incident in the plane at an angle of to the normal and is -polarized. Deep grooves are labeled “D,” shallow grooves are labeled “S.”


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Scitation: Low angular-dispersion microwave absorption of a metal dual-period nondiffracting hexagonal grating