Polarization--universal rejection filtering by ambichiral structures made of indefinite dielectric--magnetic materials

TL;DR

This paper introduces a novel ambichiral structure made of indefinite dielectric-magnetic materials that can universally reject all circular polarizations, expanding the capabilities of polarization filtering.

Contribution

It demonstrates that using indefinite dielectric-magnetic materials in ambichiral structures enables universal polarization rejection, unlike traditional dielectric-only structures.

Findings

Rejection of one circular polarization in dielectric structures

Universal rejection achieved with indefinite dielectric-magnetic materials

Two wave components exhibit positive and negative phase velocities

Abstract

An ambichiral structure comprising sheets of an anisotropic dielectric material rejects normally incident plane waves of one circular polarization (CP) state but not of the other CP state, in its fundamental Bragg regime. However, if the same structure is made of an dielectric--magnetic material with indefinite permittivity and permeability dyadics, it may function as a polarization--universal rejection filter because two of the four planewave components of the electromagnetic field phasors in each sheet are of the positive--phase--velocity type and two are of the negative--phase--velocity type.