Some Advances in the Circuit Modeling of Extraordinary Optical Transmission

Abstract. The phenomenon of extraordinary optical trans-mission (EOT) through electrically small holes perforated on opaque metal screens has been a hot topic in the optics com-munity for more than one decade. This experimentally ob-served frequency-selective enhanced transmission of electro-magnetic power through holes, for which classical Bethe’s theory predicts very poor transmission, later attracted the attention of engineers working on microwave engineering or applied electromagnetics. Extraordinary transmission was first linked to the plasma-like behavior of metals at opti-cal frequencies. However, the primary role played by the periodicity of the distribution of holes was soon made ev-ident, in such a way that extraordinary transmission was disconnected from the particular behavior of metals at op-tical frequencies. Indeed, the same phenomenon has been observed in the microwave and millimeter wave regime, for instance. Nowadays, the most commonly accepted theory explains EOT in terms of the interaction of the impinging plane wave with the surface plasmon-polariton-Bloch waves (SPP-Bloch) supported by the periodically perforated plate. The authors of this paper have recently proposed an alter-native model whose details will be briefly summarized here. A parametric study of the predictions of the model and some new potential extensions will be reported to provide addi-tional insight