Resonant Wood's anomaly diffraction condition in dielectric and plasmonic grating structures

TL;DR

This paper analyzes the conditions for resonant Wood's anomalies in dielectric and plasmonic gratings, providing spectral-angular expressions and comparing them to surface plasmon-polariton resonances to deepen understanding of light scattering phenomena.

Contribution

It introduces a unified expression for Wood's anomaly in plasmonic and dielectric gratings and compares these anomalies with surface plasmon-polariton resonances.

Findings

Derived spectral-angular dependence of Wood's anomalies.

Compared resonant Wood's anomalies with surface plasmon-polariton resonances.

Highlighted differences between dielectric and plasmonic grating behaviors.

Abstract

The general features of the light scattering resulting in the so-called resonant Wood's anomalies in the reflection and transmission spectra are described using the effective parameters of a quasi-guided mode. The expression determining the spectral angular dependence of Wood's anomaly in the case of plasmonic grating structures is given and compared to the analogous expression for dielectric grating structures. Comparison of the resonant Wood's anomalies (RWA) with the surface plasmon-polariton resonances (SPPRs) is discussed as well.