Terahertz vortex beam propagation through a magnetized plasma-ferrite structure

Abstract

Interaction of vortex beams with materials has proven to be a key for controlling and exploiting theirs properties. In this paper, we propose an adjustable stratified structure constructed from plasma and ferrite layers, which greatly manipulates the intensity and phase distributions of incoming terahertz vortex beam (TVB), and demonstrates a considerable amount of Faraday rotation. To obtain the output beam profiles, first using angular spectral expansion technique the incoming TVB is decomposed into a superposition of plane waves, then employing 4×4 matrix formalism total reflection and transmission coefficients are extracted. Numerical analysis reveals that how the variations of external static magnetic field, incident angle, and radial and angular indices of the TVB affect the features of reflected and transmitted beams. It is expected that this investigation will shed new light on the interaction of TVB with anisotropic magnetic materials, and open new possibilities for wavefront engineering and material characterization.