Electromagnetic Grazing Anomaly: Energy Flux Resonance Behaviour and Brewster Angle Analogy

TL;DR

This paper investigates electromagnetic wave diffraction at high-contrast periodic surfaces, revealing energy flux resonance behaviors and analogies to Brewster angles, with a focus on TM polarization and grazing diffraction phenomena.

Contribution

It provides a detailed analysis of energy flux anomalies and resonance effects in electromagnetic diffraction at structured interfaces, highlighting new resonance behaviors and their relation to classical anomalies.

Findings

Identification of strong energy flux maxima and minima at grazing diffraction angles

Relation of observed anomalies to Rayleigh and resonance effects

Insights into Brewster angle-like phenomena in diffraction patterns

Abstract

The diffraction of electromagnetic waves at the surface periodic structures accompanied by strong anomalous effects in different diffraction orders is considered in great detail for high-contrast interfaces. We restrict our discussion to the TM polarization of the incident wave (the magnetic field is orthogonal to the plane of incidence) and the simplest geometry when the plane of incidence is orthogonal to the grating grooves. The most attention is focused on the strong maxima and minima of the energy flux density accompanying specific grazing propagation of some diffraction order. Relation to other anomalies, both Rayleigh and the resonance ones is discussed as well.