Wood's anomalies and excitation of cyclic Sommerfeld resonances under plane wave scattering from a single dielectric cylinder at oblique incidence of light

TL;DR

This paper investigates how plane waves scatter from a dielectric cylinder at an oblique angle, leading to the excitation of cyclic Sommerfeld resonances, which are similar to Wood's anomalies in metallic gratings, and analyzes conditions for their effective excitation.

Contribution

It introduces the concept of cyclic Sommerfeld resonances in dielectric cylinders and compares them to Wood's anomalies, providing conditions for their high-quality excitation.

Findings

Cyclic Sommerfeld resonances can be excited under oblique incidence.

These resonances are analogous to Wood's anomalies in metallic gratings.

Conditions for high-quality excitation of CSWs and CSRs are identified.

Abstract

In this paper we consider a process of plane wave scattering from a single dielectric cylinder at oblique incidence under which it is possible to excite long range cyclic Sommerfeld waves (CSWs) and consequently cyclic Sommerfeld resonances (CSRs) of different orders. It is shown that the CSRs are analogous to Wood's anomalies occurred under plane wave scattering from one dimensional (1D) metallic diffraction gratings. The conditions which are necessary for an effective excitation of CSWs and CSRs with high quality factors are analyzed.