We investigate dispersion properties of a hexagonal dielectric periodic structure that can be used to engineer graded-index lenses. The connection between the geometry and its symmetries is explained. Furthermore, we demonstrate with increased symmetry more isotropic than conventional counterpart. To validate our analysis, designed, manufactured, measured planar Luneburg lens antenna. antenna h...

We propose single-step additive fabrication of graded-index optical elements by introducing the light exposure as additional dimension to three-dimensional (3D) laser writing, hence (3+1)D writing. use a commercial printer and photoresist realize proposed single step method that can be swiftly adopted for research engineering. After presenting characterization profiles via basic structures, we ...

The optimum refractive-index distribution of the high-bandwidth graded-index polymer optical fiber (POP) was clarified for the first time by consideration of both modal and material dispersions. The ultimate bandwidth achieved by the POP is investigated by a quantitative estimation of the material dispersion as well as the modal dispersion. The results indicate that even if the refractive-index...

A new technique, based on a partially automated process, for smooth end face termination of three types of plastic optical fibers (microstructured, graded-index, and step-index) is presented. The cross-sectional shape of the fibers is preserved, and the structure in microstructured plastic optical fibers (POFs) is of good quality, showing no plastic deformations. The termination is achieved in ...