Excitation of cyclical Sommerfeld waves and Wood’s anomalies in plane wave scattering from a dielectric cylinder at oblique incidence
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russian Federation
An analysis is presented of the scattering of a plane electromagnetic wave at oblique incidence from a circular dielectric cylinder. Under certain conditions this scattering process involves the excitation of cyclic surface Sommerfeld waves (SWs) capable of traveling large distances along the cylinder. It is shown that the interaction of SWs of low azimuthal order with the cylinder’s continuous (radiation) modes gives rise cyclic Sommerfeld resonances (SRs) analogous to the well-known Wood’s anomalies in the plane wave scattering from one-dimensional metallic diffraction gratings. Conditions necessary for the effective excitation of SWs and SRs are established and how SWs and SRs contribute to mode formation in microstructured optical fibers is discussed.