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We use mixed-period dielectric grooves to surround a single metal slit to realize two-beam nonsymmetrical and symmetrical emitting for the transmitted light emerged from the subwavelength slit. This proposed slit–groove-based structure is formed by combining two typical slit–groove structures, both possessing unidirectional beaming but with different beaming angles. Here, the typical slit–groove structure...
In this paper, we use mixed-period grooves to surround a subwavelength slit to realize multiple extraordinary transmittance peaks for transmitted light. The mixed-period grooves refer to a set of 1-D grooves arranged with particular groove pitches, which are formed by merging two sets of 1-D periodic grooves with similar geometries but mainly different groove periodicities. The finite-difference time-domain...
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