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Abstract
Dichroic circular polarizers (DCP) represent an important group of optical filters that transfer only that part of the incident light with the desired polarization state and absorb the remainder. However, DCPs are usually bulky and exhibit significant optical loss. Moreover, the integration of these kinds of DCP devices can be difficult and costly as different compositions of chemicals are needed to achieve the desired polarization status. Circular polarizers based on metasurfaces require only thin films in the order of hundreds of nanometers but are limited by their sensitivity to angle of incidence. Furthermore, few existing solutions offer broadband operation in the visible range. By using computational simulations, this paper proposes and analyses a plasmonic DCP structure operating in the visible, from 400 nm to 700 nm which overcomes these drawbacks. The resulting circular dichroism transmission (CDT) is more than 0.9, and the maximum transmission efficiency is greater than 78% at visible wavelengths. These CDT characteristics are largely independent of angle of incidence up to angles of 80 degrees.
Highlights
While the transmission efficiency of the circular polarizers offered by [10] can reach over 80%, the relative circular dichroism transmission (CDT) is only 0.33 in the visible band
We present our plasmonic dichroic circular polarizer (DCP) based on a five-layer polarization sensitive nanostructure (Al nanograting and nanocuboid combinations) with the capability to absorb circularly polarized light of an undesired direction
DCPs have a wide operating band through the whole visible wavelengths and its CDT is largely insensitive to the angle of incidence between 0◦ and 80◦
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Metasurface-based circular polarizers do not exhibit these drawbacks Their component nanostructures are usually fabricated from dielectric or metallic films with thicknesses in the range of a few hundred nanometers and are not bulky [14,15,16,17]. Double-helical metasurface-based nanostructures have been shown to have a broad operating range across the whole visible spectrum These structures are very difficult to fabricate using any recent nanofabrication technique [41]. We present our plasmonic DCPs based on a five-layer polarization sensitive nanostructure (Al nanograting and nanocuboid combinations) with the capability to absorb circularly polarized light of an undesired direction. Our DCPs have a wide operating band through the whole visible wavelengths and its CDT is largely insensitive to the angle of incidence between 0◦ and 80◦
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