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Hollow waveguide array with subwavelength dimensions as a space-variant polarization converter
Stefan Belle, Stefan F. Helfert, Ralf Hellmann and Jürgen Jahns Journal of the Optical Society of America B 36(5) D119 (2019) https://doi.org/10.1364/JOSAB.36.00D119
Structured illumination of a sub-wavelength hollow-waveguide array