Abstract
The ability to fully control the polarization of light using chiral metadevices has drawn considerable attention in various applications of integrated photonics, communication systems, and life sciences. In this work, we propose a comprehensive approach for the design of metasurfaces with desired polarization properties for reflected and transmitted waves based on the proper spatial arrangement of chiral inclusions in the unit cell. Polarization conversion is achieved by engineering induced electric and magnetic dipole moments of the metasurface inclusions. We show that under a proper arrangement, the same inclusion can be used as a building block of metasurfaces with drastically different wave-transformation functionalities. The horizontally and vertically oriented metallic helices were used as simplest chiral inclusions, which can be manufactured by the established 3D fabrication techniques from THz up to the visible spectral range. The proposed metadevices provide a deep understanding of the light–matter interaction for polarization conversions with helix-based structures and opens the way to new possibilities of electromagnetic polarization control with advanced chiral metadevices in communication and imaging systems.
Highlights
The polarization of electromagnetic waves (EM) is one of the fundamental properties of optical radiation
Typical chiral metasurfaces consist of chiral subwavelength inclusions arranged into a lattice that can convert the polarization of incident light in transmission or reflection regimes from linear to circular and vice versa [5,6,7] or linear to linear [8,9,10]
We have proposed Huygens’ metasurfaces based on horizontally-oriented and vertically-oriented RH and LH metallic helices for the manipulation of linearly polarization EM waves in reflection and transmission regimes in the mid-IR range
Summary
The polarization of electromagnetic waves (EM) is one of the fundamental properties of optical radiation. Despite a fairly large selection, there is considerable demand in the industry for the improvement of existing polarizers or the development of new types of polarization converters for the use in modern complex devices Such polarizers can be chiral metasurfaces which are electrically thin, compact, flexible structures with properties of controlling the polarization of light. The understanding of the fundamental coupling mechanisms between chiral inclusions as well as their arrangement in the unit cell can provide significant insight into designing metasurfaces for polarization conversion of the incident light [30]. We design Huygens’ metasurfaces based on chiral inclusions for the manipulation of polarization state in reflection and transmission regimes for midinfrared (mid-IR) spectral range. We determined the mutual arrangement of helices in the unit cell of metasurfaces for the desired polarization conversion
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