Hollow waveguide array with subwavelength dimensions as a space-variant polarization converter

• DOI: 10.1364/josab.36.00d119
• Publication Date: 2019-03-13T16:49:20Z
• Authors: Stefan Belle; Stefan F. Helfert; Ralf Hellmann; Jürgen Jahns
• Keywords: Waveguide

A hollow waveguide array with subwavelength dimensions is demonstrated as a polarization converter. An individual in the has rectangular cross-section, which leads to an anisotropy of propagation constants and therefore phase shift between vertical horizontal field components upon propagation. The was fabricated by two-photon polymerization process followed electrochemical deposition gold. consists about 2000×2500 cells, each 1150 nm×930 nm height 2 μm. With these dimensions, structure can, for example, be used at wavelength 1550 nm. Other wavelengths shifts are accessible changing cross-section height. Since widths waveguides variable, space-variant operation can implemented.