Narrow gaps for transmission through metallic structures gratings with subwavelength slits

DIANA CARINA SKIGIN; RICARDO DEPINE,

PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS

American Physical Society

Año: 2006 vol. 64 p. 66061 - 66066

1063-651X

Transmission dips in the response of metallic compound gratings formed by several wires and slits in eachperiod have been recently reported for normal illumination. These anomalies are generated by a particulararrangement of the magnetic field phases inside the subwavelength slits, and they are characterized by asignificant enhancement of the interior field. We investigate the microwave response of such systems undernon-normal illumination and show that new phase modes appear in this configuration. Contrary to the effectproduced by a defect in a photonic crystal, these systems exhibit forbidden channels within a permitted band.We also found that the appearance of these resonances is not highly dependent on the slits’ width andthickness, even though these parameters modify the overall transmittance.