Topological-phase effects and path-dependent interference in microwave structures with magnetic-dipolar-mode ferrite particles

TL;DR

This paper investigates topological-phase effects and path-dependent interference in microwave fields scattered by magnetic-dipolar-mode ferrite particles, revealing unique topological properties and resonance behaviors through numerical, analytical, and preliminary experimental methods.

Contribution

It introduces the analysis of topological-phase effects and path-dependent interference in microwave fields with MDM ferrite particles, highlighting their topological and resonance characteristics.

Findings

Identification of rotating topological-phase dislocations.

Observation of path-dependent interference effects.

Detection of split-resonance states in coupled MDM particles.

Abstract

Different ways exist in optics to realize photons carrying nonzero orbital angular momentum. Such photons with rotating wave fronts are called twisted photons. In microwaves, twisted fields can be produced based on small ferrite particles with magnetic-dipolar-mode (MDM) oscillations. Recent studies showed strong localization of the electric and magnetic energies of microwave fields by MDM ferrite disks. For electromagnetic waves irradiating MDM disks, these small ferrite samples appear as singular subwavelength regions with time and space symmetry breakings. The fields scattered by a MDM disk are characterized by topologically distinctive power-flow vortices and helicity structures. In this paper we analyze twisted states of microwave fields scattered by MDM ferrite disks. We show that in a structure of the fields scattered by MDM particles, one can clearly distinguish rotating topological-phase dislocations. Specific long-distance topological properties of the fields are exhibited clearly in the effects of path-dependent interference with two coupled MDM particles. Such double-twisted scattering is characterized by topologically originated split-resonance states. Our studies of topological-phase effects and path-dependent interference in microwave structures with MDM ferrite particles are based on numerical analysis and recently developed analytical models. We present preliminary experimental results aimed to support basic statements of our studies.