Abstract
Chiral metamaterials (CMMs) are widely used to implement devices that transform the polarization of an incident electromagnetic wave, such as polarization rotators and linear to circular converters, but rarely used as circular polarization converters. This letter presents a CMM that changes the handedness of a circularly polarized incident wave. This structure, which presents subwavelength thickness, provides polarization conversion with independence on both the front and back directions and the handedness of the incident wave. High polarization conversion efficiency is shown by both simulations and experiments.
Highlights
POLARIZATION is a characteristic key of electromagnetic (EM) waves in many fields such as wireless communications, liquid crystal display [1], optical data storage [2] or quantum information [3]
With the introduction of metamaterials, there have appeared new structures, as planar chiral metamaterials (CMMs), which provide high optical activity with subwavelength thicknesses. It can be found in the literature several planar CMM based structures printed on PCB that act as polarization rotators [9]-[12] or linear to circular converters [13]-[16]
Another less common device that acts over the polarization is the circular polarization converter
Summary
POLARIZATION is a characteristic key of electromagnetic (EM) waves in many fields such as wireless communications, liquid crystal display [1], optical data storage [2] or quantum information [3]. Polarization rotators and linear to circular polarizers are two traditional devices, comprised by multilayer structures, which transform the polarization state of an incident wave at microwave frequencies. With the introduction of metamaterials, there have appeared new structures, as planar chiral metamaterials (CMMs), which provide high optical activity with subwavelength thicknesses. It can be found in the literature several planar CMM based structures printed on PCB that act as polarization rotators [9]-[12] or linear to circular converters [13]-[16]. Another less common device that acts over the polarization is the circular polarization converter This device changes circularly polarized incident waves into the opposite handedness ones.
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