Light polarization management via reflection from arrays of sub-wavelength metallic twisted bands

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Abstract

With constant progress of nano- and microfabrication technologies, photolithography in particular, a number of sub-wavelength metallic structures have been demonstrated that can be used to manipulate light polarization. Numerical simulations of light propagation hint that helical twisted bands can have interesting polarization properties. We use three-dimensional two-photon photolithography (direct laser writing) to fabricate a few-micrometer-thick arrays of twisted bands and coat them uniformly with metal. We demonstrate that circular polarization can be generated from linear polarization upon reflection from such structures over a broad range of frequencies in the mid infrared.

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Nawrot, M., Haberko, J., Zinkiewicz, & Wasylczyk, P. (2017). Light polarization management via reflection from arrays of sub-wavelength metallic twisted bands. Applied Physics B: Lasers and Optics, 123(12). https://doi.org/10.1007/s00340-017-6864-y

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