Extraordinary transmission through arrays of slits: a circuit theory model

FRANCISCO MEDINA; FRANCISCO MESA; DIANA CARINA SKIGIN

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES

IEEE

Año: 2009

0018-9480

Extraordinary transmission and other interestingrelated phenomena for 1D periodic arrays of slits (compounddiffraction gratings) have recently been the object of intenseresearch in the optics and solid state physics communities. Thiscase should be differentiated from the extraordinary transmissionthrough arrays of small apertures on metal screens, since smallholes only support below-cutoff modes whereas slits can also supporttransverse electromagnetic modes without cutoff frequency.In this paper an equivalent-circuit approach is proposed toaccount for the most relevant details of the behavior of slit-basedperiodic structures: extraordinary transmission peaks, Fabry-Pérot resonances, and transmission dips observed in compoundstructures. The proposed equivalent-circuit model, based on wellestablished concepts of waveguide and circuit theory, providesa simple and accurate description of the phenomenon that isappropriate for educational purposes as well as for the design ofpotential devices based on the behavior of the structures understudy.