2017/12/21 by Khant Minn, Aleksei Anopchenko, Minn, Khant +5 · 1 citation
Engineering · #Advanced Fiber Optic Sensors #FOS: Physical sciences #Optical Network Technologies #Optics (physics.optics) #Photonic and Optical Devices
paper · pdf · doi:10.48550/arxiv.1712.08202
openalex publication_date 2017/12/21 · openalex created_date 2022/09/29 · openalex updated_date 2026/07/28
We report a novel optical waveguide design of a hollow step index fiber\nmodified with a thin layer of indium tin oxide (ITO). We show an excitation of\nhighly confined waveguide mode in the proposed fiber near the wavelength where\npermittivity of ITO approaches zero. Due to the high field confinement within\nthin ITO shell inside the fiber, the epsilon-near-zero (ENZ) mode can be\ncharacterized by a peak in modal loss of the hybrid waveguide. Our results show\nthat such in-fiber excitation of ENZ mode is due to the coupling of the guided\ncore mode to the thin-film ENZ mode. We also show that the phase matching\nwavelength, where the coupling takes place, varies depending on the refractive\nindex of the constituents inside the central bore of the fiber. These ENZ\nnanostructured optical fibers have many potential applications, for example, in\nENZ nonlinear and magneto-optics, as in-fiber wavelength-dependent filters, and\nas subwavelength fluid channel for optical and bio-photonic sensing.\n